Multi-wavelength fiber imaging device and system

Abstract

The application relates to the technical field of biomedical imaging, in particular to a multi-wavelength optical fiber imaging device and system to solve the problem that the existing optical fiber imaging system obtains less imaging wavelength information. The multi-wavelength optical fiber imaging device comprises multiple transmission optical fibers, a scanner and an objective lens, through the multiple transmission optical fibers with different specifications, multiple first light beams with different wavelengths can be respectively transmitted to the scanner, the scanner changes the propagation direction of the multiple first light beams with different wavelengths, and the target tissue is scanned, and the multiple first light beams with different wavelengths are focused on the target tissue by the objective lens to image the target tissue. The multi-wavelength optical fiber imaging device realizes the separate transmission of the multiple first light beams with different wavelengths, expands the wavelength range of the working light beams transmitted by the imaging device, utilizes the multiple first light beams with different wavelengths to image the target tissue, provides more imaging information of the target tissue, and meets the imaging requirements of complex application scenarios.

Description

Technical Field

[0001] This application relates to the field of biomedical imaging technology, and in particular to a multi-wavelength fiber optic imaging device and system. Background Technology

[0002] Fiber optic imaging systems transmit illumination or imaging light through optical fibers. The flexible light transmission characteristics of fibers allow these systems to penetrate deep into the human body or animal for endoscopic imaging, and also enable wearable or handheld optical imaging system designs. Telescopic fiber optic imaging systems utilize optical fibers to transmit illumination and imaging light energy, and employ mechanical or optical scanning devices positioned at a remote location to achieve two-dimensional or three-dimensional scanning imaging, offering advantages such as high resolution, low crosstalk, and high flexibility. Furthermore, by combining fiber optic imaging systems with imaging techniques such as confocal imaging, optical coherence tomography (OCT), and multiphoton imaging, a series of imaging technologies have been developed, including fiber confocal imaging, fiber multiphoton imaging, and fiber optical coherence tomography, becoming powerful tools for scientific research and disease diagnosis in the life sciences and medical fields.

[0003] However, existing fiber optic imaging systems acquire limited imaging wavelength information, which cannot meet the higher requirements of modern scientific research and clinical diagnosis for imaging wavelength information. Summary of the Invention

[0004] In view of this, the present application provides a multi-wavelength fiber optic imaging device and system based on multi-path fiber optic transmission to solve the problem that existing fiber optic imaging systems acquire relatively little imaging wavelength information.

[0005] In a first aspect, one embodiment of this application provides a multi-wavelength fiber optic imaging device, comprising: a plurality of transmission fibers, each of which is used to transmit a plurality of first beams, each transmission fiber transmitting a first beam with a different wavelength, a first end of the transmission fiber being used to receive the first beam, and a second end of the transmission fiber being used to output the first beam; a scanner, located on the first beam output side of the plurality of transmission fibers, for receiving the first beams transmitted from the second ends of the plurality of transmission fibers and changing the propagation direction of the plurality of first beams to scan a target tissue using the plurality of first beams; and an objective lens, located on the first beam output side of the scanner, for focusing the plurality of first beams onto the target tissue to image the target tissue.

[0006] In conjunction with the first aspect, in some implementations of the first aspect, the multi-wavelength fiber optic imaging apparatus further includes: a collimating optical element located between a plurality of transmission fibers and a scanner, for collimating a first beam output from the second end of the plurality of transmission fibers.

[0007] In conjunction with the first aspect, in some implementations of the first aspect, the collimating optical element includes a first collimating lens, which is located between a plurality of transmission optical fibers and a scanner, for collimating a first beam output from the second end of the plurality of transmission optical fibers; wherein the first collimating lens has a plurality of first focal points located on a first principal optical axis, the plurality of first focal points corresponding one-to-one with the plurality of first beams, and the second end of the transmission optical fiber corresponding to the first beam is located at the first focal point corresponding to the same first beam, so that the propagation directions of the plurality of first beams emitted from the first collimating lens are parallel.

[0008] In conjunction with the first aspect, in some implementations of the first aspect, the first collimating lens includes a lens and / or a lens group with an Abbe number less than a preset value to increase the spacing between adjacent first focal points.

[0009] In conjunction with the first aspect, in some implementations of the first aspect, the multi-wavelength fiber optic imaging device further includes: a first beam combining optical element located between a first collimating lens and a scanner; the first beam combining optical element having a first refractive surface and a second refractive surface that are parallel to each other; when multiple first beams with parallel propagation directions propagate to the first refractive surface, the incident angle of the first beams is greater than 0° and less than 90°; the multiple first beams can enter the first beam combining optical element from the first refractive surface and exit the first beam combining optical element from the second refractive surface; after the multiple first beams exit from the second refractive surface, the propagation directions of the multiple first beams coincide.

[0010] In conjunction with the first aspect, in some implementations of the first aspect, the multi-wavelength fiber optic imaging device further includes: a second beam combining optical element located between the first collimating lens and the scanner. The second beam combining optical element includes a plurality of first optical films arranged parallel to each other and spaced apart. Each of the plurality of first optical films corresponds one-to-one with a plurality of first beams. Each first optical film can reflect the corresponding first beam and transmit first beams other than the corresponding first beam, so that each first beam can reach the corresponding first optical film and that the propagation directions of the plurality of first beams coincide after being reflected by the corresponding first optical film.

[0011] In conjunction with the first aspect, in some implementations of the first aspect, the collimating optical element includes a second collimating lens located between a plurality of transmission optical fibers and a scanner, for collimating the first beams output from the second ends of the plurality of transmission optical fibers. The second collimating lens has a second principal optical axis; wherein the extension direction of the rotation axis of the light cone formed by the first beam emitted from the second end of each transmission optical fiber can be parallel to or coincide with the extension direction of the second principal optical axis; the second collimating lens has a plurality of second focal points and a plurality of focal planes, the plurality of second focal points corresponding one-to-one with the plurality of first beams, each focal plane containing one second focal point, and the second end of the transmission optical fiber corresponding to the first beam is located on the focal plane corresponding to the same first beam.

[0012] In conjunction with the first aspect, in some implementations of the first aspect, the multi-wavelength fiber optic imaging device further includes: a third beam combining optical element located between the second collimating lens and the scanner. The third beam combining optical element includes multiple second optical films, the normals of the multiple second optical films are arranged to intersect each other, the multiple second optical films correspond one-to-one with multiple first beams, each second optical film can reflect the corresponding first beam and transmit the first beam other than the corresponding first beam, so that each first beam can reach the corresponding second optical film, and after the multiple first beams are reflected by the corresponding second optical films, the propagation directions of the multiple first beams coincide.

[0013] In conjunction with the first aspect, in some implementations of the first aspect, multiple first beams have their own corresponding field of view, and the field of view of the multi-wavelength fiber optic imaging device is the intersection of the field of view corresponding to the multiple first beams.

[0014] In conjunction with the first aspect, in some implementations of the first aspect, the multi-wavelength fiber optic imaging device further includes: a probe having a receiving space for accommodating the second ends of multiple transmission fibers, a scanner, and an objective lens.

[0015] Secondly, one embodiment of this application provides a multi-wavelength fiber optic imaging system, comprising: a multi-wavelength fiber optic imaging device mentioned in any of the first aspects; and multiple light sources, each located on a first beam receiving side of a multiple transmission optical fiber, for providing first beams of different wavelengths to the first ends of the multiple transmission optical fibers respectively.

[0016] In conjunction with the second aspect, the multi-wavelength fiber optic imaging system further includes: at least one coupler located between the plurality of light sources and the first end of the corresponding transmission fiber, for coupling a first beam provided by at least one light source to the first end of the corresponding transmission fiber.

[0017] The multi-wavelength fiber optic imaging device provided in this embodiment includes multiple transmission fibers, a scanner, and an objective lens. By using multiple transmission fibers of different specifications, multiple first beams of different wavelengths can be transmitted to the scanner. The scanner changes the propagation direction of the multiple first beams of different wavelengths and scans the target tissue. The multiple first beams of different wavelengths can be focused on the target tissue by the objective lens to image the target tissue. The multi-wavelength fiber optic imaging device realizes the separate transmission of multiple first beams of different wavelengths, expands the wavelength range of the working beam transmitted by the multi-wavelength fiber optic imaging device, and uses multiple first beams of different wavelengths to image the target tissue, so as to provide more imaging information of the target tissue and meet the imaging needs of complex application scenarios. Attached Figure Description

[0018] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0019] Figure 1 The diagram shown is a structural schematic of an application scenario for a multi-wavelength fiber optic imaging device provided in an embodiment of this application.

[0020] Figure 2 The diagram shown is a structural schematic of an application scenario for a multi-wavelength fiber optic imaging device provided in another embodiment of this application.

[0021] Figure 3 The diagram shown is a structural schematic of an application scenario of a transmission optical fiber and a first collimating lens provided by an embodiment of this application.

[0022] Figure 4 The diagram shown is a structural schematic of an application scenario for a multi-wavelength fiber optic imaging device provided in another embodiment of this application.

[0023] Figure 5 The diagram shown is a structural schematic of an application scenario of a first beam combining optical element provided in an embodiment of this application.

[0024] Figure 6 The diagram shown is a structural schematic of an application scenario for a second beam combining optical element provided in an embodiment of this application.

[0025] Figure 7 The diagram shown is a structural schematic of an embodiment of this application, applicable to a transmission optical fiber and a second collimating lens.

[0026] Figure 8 The diagram shown is a structural schematic of an application scenario for a multi-wavelength fiber optic imaging device provided in another embodiment of this application.

[0027] Figure 9 The diagram shown is a structural schematic of an application scenario for a third beam combining optical element provided in an embodiment of this application.

[0028] Figure 10 The diagram shown is a schematic representation of the field of view of a multi-wavelength fiber optic imaging device provided in an embodiment of this application.

[0029] Figure 11 The diagram shown is a structural schematic of an application scenario for a multi-wavelength fiber optic imaging system provided in an embodiment of this application.

[0030] Figure 12 The diagram shown is a structural schematic of an embodiment of this application, applicable to a scenario involving transmission optical fibers and light sources.

[0031] Figure label:

[0032] 1. Multi-wavelength fiber optic imaging system; 10. Multi-wavelength fiber optic imaging device; 11. Transmission fiber; 110. First end of transmission fiber; 111. Second end of transmission fiber; 112. First beam output side of transmission fiber; 113. First beam receiving side of transmission fiber; 114. Second end of transmission fiber; 115. First end of transmission fiber; 12. Scanner; 120. First beam output side; 13. Objective lens; 14. Collimating optical element; 140. First collimating lens; 1400. First focal point; 141. Second collimating lens; 1410. Second focal point; 15. First beam combining optical element; 150. First refractive surface; 151. Second refractive surface; 16. Second beam combining optical element Components; 160, First optical film layer; 17, Third beam combining optical element; 170, Second optical film layer; 18, Probe; 180, Accommodation space; 19, First fiber optic ferrule; 20, First beam; 200, First field of view; 201, Second field of view; 202, Third field of view; 203, Field of view of multi-wavelength fiber optic imaging device; 30, Target tissue; 40, Light source; 50, Coupler; 60, Second fiber optic ferrule; 70, Mirror; 80, Optical modulator; 91, Second beam collecting module; 910, Beam splitter; 911, Photoelectric conversion module; 912, Condensing lens; 92, Main unit; L1, First main optical axis; L2, Second main optical axis; L3, Rotation axis. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] Fiber optic imaging systems transmit illumination or imaging light through optical fibers. The flexible light transmission characteristics of fibers allow these systems to penetrate deep into the human body or animal for endoscopic imaging, and also enable wearable or handheld optical imaging system designs. Telescopic fiber optic imaging systems utilize optical fibers to transmit illumination and imaging light energy, and employ mechanical or optical scanning devices positioned at a remote location to achieve two-dimensional or three-dimensional scanning imaging, offering advantages such as high resolution, low crosstalk, and high flexibility. Furthermore, by combining fiber optic imaging systems with imaging techniques such as confocal imaging, optical coherence tomography (OCT), and multiphoton imaging, a series of imaging technologies have been developed, including fiber confocal imaging, fiber multiphoton imaging, and fiber optical coherence tomography, becoming powerful tools for scientific research and disease diagnosis in the life sciences and medical fields.

[0035] However, existing fiber optic imaging devices mainly rely on a single wavelength beam of light to irradiate the target tissue for imaging. They can only acquire imaging information of the target tissue at this wavelength, resulting in limited imaging information acquired by fiber optic imaging devices. This limits the in-depth understanding and analysis of the target tissue and cannot meet the higher demands of modern scientific research and clinical diagnosis for imaging information.

[0036] To address the aforementioned issues, this application provides a multi-wavelength fiber optic imaging device based on multi-path fiber optic transmission, offering an imaging tool capable of acquiring more imaging information for scientific research and clinical diagnosis.

[0037] Figure 1 The diagram shown is a structural schematic of an application scenario for a multi-wavelength fiber optic imaging device provided in an embodiment of this application. Figure 2 The diagram shown is a structural schematic of an application scenario for a multi-wavelength fiber optic imaging device according to another embodiment of this application. For ease of understanding, the following is combined with... Figure 1 and Figure 2 The multi-wavelength fiber optic imaging device provided in this embodiment will be described in detail below. The multi-wavelength fiber optic imaging device 10 includes: multiple transmission fibers 11, a scanner 12, and an objective lens 13.

[0038] Multiple transmission optical fibers 11 are used to transmit multiple first beams 20, each transmitting a first beam 20 with a different wavelength. The first end 110 of the transmission optical fiber is used to receive the first beam 20, and the second end 111 of the transmission optical fiber is used to output the first beam 20.

[0039] Specifically, the transmission fiber 11 is used to transmit the first beam 20. Multiple transmission fibers 11 can respectively transmit the first beam 20 across multiple spectral ranges. The transmission fiber 11 is capable of transmitting the first beam 20 from a first end 110 to a second end 111. For example, both the first end and the second end of the transmission fiber can be the end of the transmission fiber.

[0040] For example, the first beam can be used as illumination light or excitation light. For example, the first beam can be visible light or invisible light. For example, the first beam can be a red light beam, a blue light beam, or a green light beam. For example, the number of transmission optical fibers can be the same as the number of wavelengths of the first beam. Each wavelength corresponds to one wavelength type.

[0041] For example, the material and structure of the transmission optical fiber can be selected according to the wavelength of the first beam to be transmitted. For example, the transmission optical fiber may include silica fiber or composite fiber. For instance, the transmission optical fiber may be a composite fiber comprising a plastic cladding and a liquid core. For example, the transmission optical fiber may include a liquid waveguide. For example, the transmission optical fiber may include a hollow-core fiber. For example, the specifications of multiple transmission optical fibers may be different.

[0042] The scanner 12 is located on the first beam output side 112 of the plurality of transmission optical fibers, and is used to receive the first beam 20 transmitted from the second end 111 of the plurality of transmission optical fibers, and change the propagation direction of the plurality of first beams 20, so as to scan the target tissue 30 using the plurality of first beams 20.

[0043] Specifically, the first beam output side 112 of the transmission fiber is the side of the transmission fiber 11 from which the first beam 20 is emitted. Further, the first beam output side 112 of the transmission fiber is the side of the second end 111 of the transmission fiber from which the first beam 20 is emitted. The first beams 20 emitted from multiple transmission fibers 11 can all be received by the scanner 12. Exemplarily, the first beams emitted from all transmission fibers can all be received by the scanner 12. Exemplarily, the scanner 12 performs two-dimensional planar scanning or three-dimensional stereoscopic scanning of the target tissue by changing the emission angle of the first beam. Exemplarily, the scanner 12 can include a mechanical scanner. For example, the scanner can include a motor and a galvanometer or rotating mirror. Exemplarily, the scanner 12 can also include an optical scanner. For example, the scanner can include a prism, a grating, an acousto-optic crystal, or an electro-optic crystal.

[0044] Objective lens 13 is located on the first beam output side 120 of the scanner and is used to focus multiple first beams 20 onto target tissue 30 to image the target tissue 30.

[0045] Specifically, the first beam output side 120 of the scanner is the side of the scanner 12 that emits the first beam 20. Exemplarily, the objective lens can be a lens group composed of several lenses, or it can be a single lens. Exemplarily, the objective lens is used to focus the first beam onto target tissue. Exemplarily, the target tissue can include biological tissue.

[0046] In some applications, after receiving the first beams 20 transmitted from the second ends 111 of multiple transmission optical fibers, the scanner 12 can change the propagation direction of the first beams 20 in both tilt and pitch directions, thereby using the multiple first beams 20 to scan one or more two-dimensional planes of the target tissue 30. The objective lens 13 focuses the multiple first beams 20 onto the scanned two-dimensional plane to image the target tissue 30.

[0047] In some application scenarios, refer to Figure 1 The multi-wavelength fiber optic imaging device 10 may include three transmission fibers 11. The first light beam 20 is a red, blue, or green light beam. The three transmission fibers 11 transmit the red, blue, and green light beams respectively. All three beams are received by the scanner 12. The scanner 12 simultaneously scans the target tissue 30 using the red, blue, and green light beams. The objective lens 13 simultaneously outputs the red, blue, and green light beams to the target tissue 30. The multi-wavelength fiber optic imaging device 10 enables the simultaneous illumination of the target tissue 30 with red, blue, and green light beams, achieving multicolor imaging of the target tissue 30 and providing more imaging information.

[0048] In some applications, the target tissue can include multiple sub-target tissues. Different sub-target tissues can be labeled with fluorescent dyes of different excitation or emission wavelengths. Multi-wavelength fiber optic imaging devices direct multiple first beams of different wavelengths onto the target tissue, allowing the acquisition of the distribution of each sub-target tissue, thereby obtaining the tissue structure distribution of the target tissue and providing more structural information and diagnostic basis for scientific research or clinical disease diagnosis.

[0049] In some applications, multiple first beams of different wavelengths reach the target tissue via a scanner and objective lens. The target tissue can respond to these first beams, and multiple second beams of different wavelengths are emitted from the target tissue. In some implementations, the objective lens is also used to receive the multiple second beams of different wavelengths. Multi-wavelength fiber optic imaging devices may also include a dichroic mirror and an imaging fiber. The dichroic mirror, located between the objective lens and the scanner, transmits multiple first beams and reflects multiple second beams. One end of the imaging fiber is located on the second beam output side of the dichroic mirror, used to receive the multiple second beams reflected by the dichroic mirror. The other end of the imaging fiber outputs the multiple second beams from the dichroic mirror, allowing them to be collected. In other implementations, the multiple second beams can be collected after sequentially passing through the objective lens, scanner, and multiple transmission fibers.

[0050] For example, the multi-wavelength fiber optic imaging apparatus also includes one or more fiber optic sleeves. A fiber optic sleeve may be fitted over one or more transmission fibers.

[0051] For example, a multi-wavelength fiber optic imaging device can be a multi-wavelength fiber optic imaging device based on multi-path fiber optic transmission.

[0052] The multi-wavelength fiber optic imaging device provided in this embodiment includes multiple transmission fibers, a scanner, and an objective lens. By using multiple transmission fibers of different specifications, multiple first beams of different wavelengths can be transmitted to the scanner. The scanner changes the propagation direction of the multiple first beams of different wavelengths and scans the target tissue. The multiple first beams of different wavelengths can be focused on the target tissue by the objective lens to image the target tissue. The multi-wavelength fiber optic imaging device realizes the separate transmission of multiple first beams of different wavelengths, expands the wavelength range of the working beam transmitted by the multi-wavelength fiber optic imaging device, and uses multiple first beams of different wavelengths to image the target tissue, so as to provide more imaging information of the target tissue and meet the imaging needs of complex application scenarios.

[0053] In some embodiments, such as Figure 1 and Figure 2 As shown, the multi-wavelength fiber optic imaging device 10 also includes a collimating optical element 14. The collimating optical element 14 is located between the plurality of transmission optical fibers 11 and the scanner 12, and is used to collimate the first beam 20 output from the second end 111 of the plurality of transmission optical fibers.

[0054] Specifically, the collimating optical element 14 can collimate the first beam 20 output from multiple transmission optical fibers 11. Exemplarily, the collimating optical element 14 can collimate the first beam 20 output from all transmission optical fibers 11. Exemplarily, the collimating optical element may include a lens or a lens group. Exemplarily, the collimating optical element may include an achromatic cemented lens.

[0055] For example, the collimating optical element may have two sides arranged opposite to each other, the second ends of a plurality of transmission optical fibers may be located on one side of the collimating optical element, and the scanner may be located on the other side of the collimating optical element.

[0056] The multi-wavelength fiber optic imaging device provided in this embodiment also includes a collimating optical element located between multiple transmission fibers and the scanner. The collimating optical element can collimate the first beam output from the multiple transmission fibers, which helps to simplify the structure of the multi-wavelength fiber optic imaging device and reduce the structural complexity of the multi-wavelength fiber optic imaging device.

[0057] Figure 3 The diagram shown is a structural schematic of an application scenario of a transmission optical fiber and a first collimating lens provided by an embodiment of this application. Figure 4 The diagram shown is a structural schematic of an application scenario for a multi-wavelength fiber optic imaging device provided in another embodiment of this application.

[0058] In some embodiments, such as Figures 2 to 4 As shown, the collimating optical element 14 includes a first collimating lens 140. The first collimating lens 140 is located between a plurality of transmission optical fibers 11 and a scanner 12, and is used to collimate the first beam 20 output from the second end 111 of the plurality of transmission optical fibers. The first collimating lens 140 has a first principal optical axis L1.

[0059] The first collimating lens 140 has multiple first focal points 1400 located on the first principal optical axis L1, each corresponding to a multiple first beam 20. The second end 111 of the transmission optical fiber corresponding to each first beam 20 is located at the same first focal point 1400, so that the propagation directions of the multiple first beams 20 emitted from the first collimating lens 140 are parallel. Specifically, after collimation by the first collimating lens 140, the propagation directions of the multiple first beams 20 are all parallel to the first principal optical axis L1. The beam directions of the multiple first beams 20 are the same.

[0060] Specifically, the second end 111 of the transmission optical fiber can be the end of the transmission optical fiber 11. Since the wavelengths of the multiple first beams 20 are different, each first beam 20 corresponds to a different first focal point 1400. All the multiple first focal points 1400 are located on the first principal optical axis L1 and are arranged at intervals along the first principal optical axis L1 of the first collimating lens 140. The first beams 20 output from the second end 111 of the multiple transmission optical fibers are directed from their corresponding first focal points 1400 to the first collimating lens 140, thus achieving collimation of the multiple first beams 20.

[0061] For example, the second end 111 of the transmission optical fiber can be the end face of the end of the transmission optical fiber 11. The center point of the end face is located at the first focus 1400.

[0062] For example, such as Figure 3 As shown, the first collimating lens 140 may have two opposite sides, the second ends 111 of the plurality of transmission optical fibers may be located on one side of the first collimating lens 140, and the scanner 12 may be located on the other side of the first collimating lens 140. The plurality of first focal points 1400 and the second ends 111 of the plurality of transmission optical fibers may be located on the same side of the first collimating lens 140.

[0063] For example, such as Figure 3As shown, in each transmission fiber 11, the second end 111 of the transmission fiber can be the end of the second end 114 of the transmission fiber. The extension directions of the second ends 114 of the multiple transmission fibers can be parallel to each other. The extension directions of the second ends 114 of the transmission fibers can be intersected with the extension direction of the first principal optical axis L1. The parallel extension directions of the second ends 114 of the multiple transmission fibers are beneficial to reducing the overall circumferential size of the second ends 114 of the multiple transmission fibers, so that the circumferential size of the multi-wavelength fiber imaging device 10 can be set to be smaller. It is also beneficial to reduce the total area of ​​the light spots of the beams corresponding to the multiple first beams 20, so that the volume of the first collimating lens 140 can be set to be smaller while still meeting the collimation requirements of the multiple first beams 20, which is beneficial to reducing the volume and weight of the multi-wavelength fiber imaging device 10.

[0064] For example, such as Figure 3 As shown, the multi-wavelength fiber optic imaging system 1 may further include a first fiber optic ferrule 19. The second ends 114 of multiple transmission fibers can be inserted into the same first fiber optic ferrule 19. This achieves the fixation of the second ends 111 of multiple transmission fibers and helps to reduce the overall circumferential size of the second ends 114 of multiple transmission fibers.

[0065] For example, such as Figure 3 As shown, on the plane between the centerline of the second end 114 of the transmission fiber and the first principal optical axis L1, the orthographic projection of the second end 114 of the transmission fiber is located on one side of the first principal optical axis L1, and the orthographic projection of the first collimating lens 140 is located on the other side of the first principal optical axis L1. With this configuration, on the plane between the centerline of the second end 114 of the transmission fiber and the first principal optical axis L1, the first beams 20 transmitted by the multiple transmission fibers 11 can exit towards the same side of the first principal optical axis L1, allowing the first collimating lens 140 to retain only the portion located on the other side of the first principal optical axis L1, thus allowing the volume of the first collimating lens 140 to be set relatively small. For example, on the plane perpendicular to the first principal optical axis L1, the shape of the orthographic projection of the first collimating lens 140 can include a fan shape. For example, the first collimating lens 140 can be formed by cutting a conventional collimating lens. The first collimating lens 140 can be the portion of a conventional collimating lens through which the multiple first beams 20 pass.

[0066] For example, such as Figure 4As shown, multiple first beams 20 can sequentially pass through the first collimating lens 140, the scanner 12, and the objective lens 13 before reaching the target tissue 30. In other words, the multiple first beams 20, after being collimated by the first collimating lens 140, do not need to be combined before reaching the target tissue 30. This configuration simplifies the structure of the multi-wavelength fiber optic imaging device, reduces its size and weight, and allows it to meet the requirements of miniaturization and lightweight design. This makes the multi-wavelength fiber optic imaging device suitable for applications with high requirements for size and weight. For example, the multi-wavelength fiber optic imaging device can be used as an endoscope to observe the internal cavities of animals or humans.

[0067] The multi-wavelength fiber optic imaging device provided in this embodiment uses a first collimating lens as a collimating optical element to collimate first beams transmitted through multiple transmission fibers. Since the wavelengths of the multiple first beams are different, each first beam corresponds to a different first focal point of the first collimating lens. By positioning the second end of the transmission fiber corresponding to the first beam at the same first focal point, collimation of the first beams transmitted through multiple transmission fibers is achieved. This also ensures that the beam pointing angles of the multiple first beams collimated by the first collimating lens are the same, and that the propagation directions of the multiple first beams are parallel. This facilitates imaging of target tissues without the need for beam combining.

[0068] In some embodiments, the first collimating lens 140 may include a lens with an Abbe number less than a preset value to increase the spacing between adjacent first focal points 1400. The first collimating lens 140 may also include a lens group to increase the spacing between adjacent first focal points 1400.

[0069] Since the first collimating lens includes a lens with an Abbe number less than a preset value, or is formed by a lens group, the dispersion of the first collimating lens can be enhanced to increase the spacing between adjacent first focal points so that the second end of the transmission optical fiber has sufficient physical space for arrangement.

[0070] For example, the preset value can be less than or equal to 60. For instance, the first collimating lens can include a lens with an Abbe number less than or equal to 60. For example, the Abbe number of the lens included in the first collimating lens can be 30, 40, or 60. For example, the first collimating lens can be an aspherical lens.

[0071] For example, the first collimating lens may include a lens group, which may be formed by fixing multiple lenses of different materials together through a mechanical structure or by gluing.

[0072] Figure 5 The diagram shown is a structural schematic of an embodiment of this application for a first beam-combining optical element. (Reference) Figure 2 and Figure 5The multi-wavelength fiber optic imaging device 10 also includes a first beam combining optical element 15.

[0073] The first beam combining optical element 15 is located between the first collimating lens 140 and the scanner 12. The first beam combining optical element 15 has a first refractive surface 150 and a second refractive surface 151 that are parallel to each other. When multiple first beams 20 with parallel propagation directions propagate to the first refractive surface 150, the incident angle of the first beams 20 is greater than 0° and less than 90°. The multiple first beams 20 can enter the first beam combining optical element 15 through the first refractive surface 150 and exit the first beam combining optical element 15 through the second refractive surface 151. After exiting the second refractive surface 151, the propagation directions of the multiple first beams 20 coincide.

[0074] In some application scenarios, such as Figure 5 As shown, after being collimated by the first collimating lens 140, the beams of the multiple first beams 20 point in the same direction, and their propagation directions are parallel but do not coincide. The centroids of the beams corresponding to the multiple first beams 20 have a small gap and do not overlap. Since the incident angle of the first beam 20 is greater than 0° and less than 90° when it propagates to the first refractive surface 150, refraction can occur when the first beam 20 enters the first beam combining optical element 15 from the first refractive surface 150. Because the first refractive surface 150 and the second refractive surface 151 are parallel, the first beam 20 will be laterally deflected when it exits the first beam combining optical element 15.

[0075] Since the wavelengths of the multiple first beams 20 are different, the refractive index of the first beam combining optical element 15 is different for the first beams 20 with different wavelengths. After the multiple first beams 20 enter the first beam combining optical element 15 through the first refractive surface 150 and exit the first beam combining optical element 15 through the second refractive surface 151, the lateral displacements of the multiple first beams 20 are different, so that the centroids of the beams corresponding to the multiple first beams 20 can coincide, and the propagation directions of the multiple first beams 20 can coincide, thereby realizing the beam combining of the multiple first beams 20.

[0076] Exemplarily, the first beam-combining optical element may include one or more optical glass plates. Exemplarily, the propagation directions of multiple first beams can be made to coincide by adjusting one or more of the following factors: the angle between the first beam and the first refractive surface, the distance between the second refractive surface and the first refractive surface, and the refractive index and dispersion characteristics of the first beam-combining optical element. Exemplarily, the number of first beams of different wavelengths is two. The centroid of the collimated light spots formed by the two first beams can be adjusted by adjusting the angle between the first beam and the first refractive surface.

[0077] For example, refer to Figure 2Multiple first beams can sequentially pass through a first collimating lens, a first beam combining optical element, a scanner, and an objective lens before reaching the target tissue.

[0078] The multi-wavelength fiber optic imaging device provided in this embodiment further includes a first beam-combining optical element. The first beam-combining optical element has a first refractive surface and a second refractive surface that are parallel to each other. Multiple first beams, collimated by a first collimating lens and with parallel propagation directions, are refracted when they enter the first beam-combining optical element through the first refractive surface and are further refracted when they exit the first beam-combining optical element through the second refractive surface. Because the wavelengths of the multiple first beams are different, the refractive index of the first beam-combining optical element is different for first beams of different wavelengths, and the lateral displacements of the multiple first beams are also different. This allows the propagation directions of the multiple first beams to coincide, achieving beam combining of corresponding beams and enabling multiple first beams of different wavelengths to image the same area of ​​the target tissue.

[0079] Figure 6 The diagram shown is a structural schematic of an embodiment of this application for a second beam-combining optical element. Figure 2 and Figure 6 As shown, the multi-wavelength fiber optic imaging device 10 also includes a second beam combining optical element 16.

[0080] The second beam combining optical element 16 is located between the first collimating lens 140 and the scanner 12. The second beam combining optical element 16 includes a plurality of first optical films 160 arranged parallel to each other and spaced apart, with each of the plurality of first optical films 160 corresponding to a plurality of first beams 20. Each first optical film 160 can reflect the corresponding first beam 20 and transmit the first beams 20 other than the corresponding first beam 20, so that each first beam 20 can reach the corresponding first optical film 160, and that after the plurality of first beams 20 are reflected by their respective first optical film 160, the propagation directions of the plurality of first beams 20 coincide.

[0081] In some application scenarios, after being collimated by the first collimating lens 140, the beams of multiple first beams 20 point in the same direction, and their propagation directions are parallel but do not overlap. The centroids of the beams corresponding to the multiple first beams 20 have a small gap and do not overlap. When the multiple first beams 20 propagate to the second beam combining optical element 16, since the multiple first optical films 160 correspond one-to-one with the multiple first beams 20, each first optical film 160 can reflect the corresponding first beam 20 and transmit the first beams 20 other than the corresponding first beam 20, so that each first beam 20 can reach the corresponding first optical film 160 and be reflected by the corresponding first optical film 160.

[0082] Since the multiple first optical film layers 160 are arranged in parallel and spaced apart, and the propagation directions of the multiple first beams 20 are parallel, the lateral displacement of the first beams 20 can be independently adjusted by adjusting the position of the first optical film layers 160, so that the centroids of the beams corresponding to the multiple first beams 20 coincide and the propagation directions of the multiple first beams 20 coincide, so as to achieve beam combining of the beams corresponding to the multiple first beams 20.

[0083] For example, when a plurality of first beams 20 with parallel propagation directions propagate to the second beam combining optical element 16, the propagation direction of each first beam 20 is neither parallel nor perpendicular to the corresponding first optical film layer 160.

[0084] For example, multiple first beams can sequentially pass through a first collimating lens, a second beam combining optical element, a scanner, and an objective lens before reaching the target tissue.

[0085] Exemplarily, the first optical film layer may include a dichroic film. Exemplarily, the first optical film layer may also include a narrowband reflective film. Optionally, the second beam-combining optical element may include a plurality of stacked optical glass plates, the surfaces of which are coated with the first optical film layer. Exemplarily, the number of optical glass plates may be the same as the number of wavelengths of the first beam. The optical glass plates have a first plane and a second plane disposed opposite to each other. The first plane of each optical glass plate is coated with a corresponding first optical film layer.

[0086] The multi-wavelength fiber optic imaging device provided in this embodiment further includes a second beam-combining optical element. The second beam-combining optical element includes multiple first optical films arranged parallel to each other and spaced apart, with each first optical film corresponding to a single first beam. Each first optical film can reflect its corresponding first beam and transmit other first beams, ensuring that each first beam reaches its corresponding first optical film and is reflected by it. This causes the centroids of the beams corresponding to the multiple first beams to coincide, and the propagation directions of the multiple first beams collimated by the first collimating lens to coincide, achieving beam combining. This allows multiple first beams of different wavelengths to image the same area of ​​the target tissue.

[0087] Furthermore, by adjusting the position of the first optical film layer, the lateral displacement of the first beam can be adjusted independently. Even in complex situations such as when the first beam has a large number of wavelengths, the second beam combining optical element can still combine multiple beams corresponding to the first beam, thus expanding the application scenarios of multi-wavelength fiber optic imaging devices.

[0088] Figure 7The diagram shown is a structural schematic of an embodiment of this application, applicable to a transmission optical fiber and a second collimating lens. Figure 8 The diagram shown is a structural schematic of an application scenario for a multi-wavelength fiber optic imaging device provided in another embodiment of this application.

[0089] like Figure 7 and Figure 8 As shown, the collimating optical element 14 includes a second collimating lens 141. The second collimating lens 141 is located between the plurality of transmission optical fibers 11 and the scanner 12, and is used to collimate the first beam 20 output from the second ends 111 of the plurality of transmission optical fibers. The second collimating lens 141 has a second principal optical axis L2. The extension direction of the rotation axis L3 of each optical cone formed by the first beam 20 emitted from the second ends 111 of the transmission optical fibers can be parallel to or coincide with the extension direction of the second principal optical axis L2.

[0090] Specifically, the first beam 20 is emitted from the second end 111 of the transmission optical fiber and forms a light cone. The extension direction of the rotation axis L3 of the light cone formed by the first beam 20 is parallel to or coincides with the second principal optical axis L2.

[0091] In some implementations, the extension direction of the rotation axis of the optical cone formed by the first beams 20 emitted from the second ends 111 of the multiple transmission optical fibers is parallel to the extension direction of the second principal optical axis L2. In other implementations, among the first beams 20 emitted from the second ends 111 of the multiple transmission optical fibers, the extension direction of the rotation axis L3 of the optical cone formed by one first beam 20 coincides with the extension direction of the second principal optical axis L2, while the extension directions of the rotation axis L3 of the optical cones formed by the remaining first beams 20 are all parallel to the extension direction of the second principal optical axis L2.

[0092] The second collimating lens 141 has multiple second focal points 1410 and multiple focal planes. The multiple second focal points 1410 correspond one-to-one with multiple first beams 20, and each focal plane contains one second focal point 1410. The second end 111 of the transmission optical fiber corresponding to the first beam 20 is located on the focal plane corresponding to the same first beam 20.

[0093] Specifically, since the wavelengths of the multiple first beams 20 are different, each first beam 20 corresponds to a different second focal point 1410. The different second focal points 1410 are located on different focal planes. These multiple focal planes are perpendicular to the second principal optical axis L2 and are spaced apart. Because the second end 111 of the transmission fiber corresponding to each first beam 20 is located on the focal plane corresponding to the same first beam 20, and the extension direction of the rotation axis L3 of the light cone formed by each first beam 20 emitted from the second end 111 of the transmission fiber can be parallel to or coincide with the extension direction of the second principal optical axis L2, the second collimating lens 141 can simultaneously collimate the multiple first beams 20 and compensate for the axial chromatic aberration when the multiple first beams 20 are collimated.

[0094] For example, the second end 111 of the transmission optical fiber can be the end face of the end of the transmission optical fiber 11. For example, the extension direction of the second end 114 of the transmission optical fiber is parallel to or coincides with the extension direction of the second principal optical axis L2.

[0095] For example, such as Figure 8 As shown, multiple first beams 20 can sequentially pass through the second collimating lens 141, the scanner 12, and the objective lens 13 before reaching the target tissue. In other words, the multiple first beams collimated by the second collimating lens do not need to be combined before reaching the target tissue. This configuration simplifies the structure of the multi-wavelength fiber optic imaging device, reduces its size and weight, and allows it to meet the requirements of miniaturization and lightweight design, making it suitable for applications with strict size and weight constraints.

[0096] The multi-wavelength fiber optic imaging device provided in this embodiment uses a second collimating lens as a collimating optical element to collimate the first beams transmitted through multiple transmission fibers. Since the wavelengths of the multiple first beams are different, each first beam corresponds to a different second focal point. Because the line connecting the orthographic projection of the second end of the transmission fiber corresponding to the first beam and the second focal point corresponding to the same first beam on the plane passing through the second principal optical axis is perpendicular to the second principal optical axis, the second end of the transmission fiber corresponding to the first beam is located on the focal plane corresponding to the same first beam. Furthermore, since the extension direction of the rotation axis of the light cone formed by each first beam emitted from the second end of the transmission fiber can be parallel to or coincide with the extension direction of the second principal optical axis, the second collimating lens can simultaneously collimate multiple first beams and compensate for axial chromatic aberration during collimation. This avoids the need for complex achromatic designs in the multi-wavelength fiber optic imaging device, reducing the manufacturing cost, size, and weight of the device. It also facilitates imaging of target tissues by allowing multiple first beams collimated by the second collimating lens to be imaged without beam combining.

[0097] Figure 9The diagram shown is a structural schematic of an embodiment of this application for a third beam-combining optical element. (Reference) Figure 2 , Figure 8 and Figure 9 The multi-wavelength fiber optic imaging device 10 also includes a third beam combining optical element 17. The third beam combining optical element 17 is located between the second collimating lens 141 and the scanner 12. The third beam combining optical element 17 includes multiple second optical layers 170, whose normals are intersecting each other, and each second optical layer 170 corresponds one-to-one with a multiple first beam 20. Each second optical layer 170 can reflect its corresponding first beam 20 and transmit other first beams 20 besides their corresponding first beam 20, so that each first beam 20 can reach its corresponding second optical layer 170, and that after being reflected by their respective second optical layers 170, the propagation directions of the multiple first beams 20 coincide.

[0098] The third beam combining optical element 17 operates on a similar principle to the second beam combining optical element 16. In some applications, such as... Figure 9 As shown, after being collimated by the second collimating lens 150, the propagation directions of the multiple first beams 20 intersect each other, and the centroids of the beams corresponding to the multiple first beams 20 do not coincide. When the multiple first beams 20 propagate to the third beam combining optical element 17, since the multiple second optical films 170 correspond one-to-one with the multiple first beams 20, each second optical film 170 can reflect the corresponding first beam 20 and transmit the first beams 20 other than the corresponding first beam 20, so that each first beam 20 can reach the corresponding second optical film 170 and be reflected by the corresponding second optical film 170.

[0099] Since the normals of the multiple second optical films 170 are intersecting each other, the incident angle and incident point of the first beam 20 can be independently adjusted by adjusting the position and angle of the second optical films 170, so that the centroids of the beams corresponding to the multiple first beams 20 coincide and the propagation directions of the multiple first beams 20 coincide, thereby realizing the beam combining of the multiple first beams 20.

[0100] For example, such as Figure 9 As shown, multiple second optical film layers 170 can be spaced apart. Adjacent second optical film layers can also be connected. The second optical film layer can, for example, include a dichroic film. The second optical film layer can, for example, include a narrowband reflective film, a broadband reflective film, or a metallic film.

[0101] For example, multiple first beams can sequentially pass through a second collimating lens, a third beam combining optical element, a scanner, and an objective lens before reaching the target tissue.

[0102] The multi-wavelength fiber optic imaging device provided in this embodiment further includes a third beam-combining optical element. This third beam-combining optical element comprises multiple second optical layers, whose normals are intersecting each other. Each second optical layer corresponds one-to-one with a plurality of first beams. Each second optical layer can reflect its corresponding first beam and transmit other first beams besides its corresponding first beam, ensuring that each first beam reaches its corresponding second optical layer and is reflected by it. This causes the centroids of the beams corresponding to the multiple first beams to coincide, and the propagation directions of the multiple first beams collimated by the second collimating lens to coincide, achieving beam combining of the multiple first beams. This allows multiple first beams of different wavelengths to image the same area of ​​the target tissue.

[0103] Furthermore, by adjusting the position and angle of the second optical film, the incident angle and incident point of the first beam can be adjusted independently. Even in complex situations such as when the first beam has a large number of wavelengths, the third beam combining optical element can still combine multiple beams corresponding to the first beam, thus expanding the application scenarios of multi-wavelength fiber optic imaging devices.

[0104] Figure 10 The diagram shown is a schematic representation of the field of view of a multi-wavelength fiber optic imaging device according to an embodiment of this application. Figure 10 As shown, the multiple first beams 20 have their own corresponding field of view ranges, and the field of view range 203 of the multi-wavelength fiber optic imaging device is the intersection of the field of view ranges corresponding to the multiple first beams 20.

[0105] Since the field of view of each of the multiple first beams 20 may not completely overlap, for example, the propagation directions of the multiple first beams incident on the objective lens may intersect each other, the intersection of the field of view of each of the multiple first beams 20 can be obtained and the intersection can be determined as the field of view of the micro device 10. The field of view 203 of the multi-wavelength fiber optic imaging device can be determined and calibrated to improve the imaging quality.

[0106] For example, such as Figure 10 As shown, the first light beam 20 is a red, blue, or green light beam. Three transmission optical fibers 11 transmit the red, blue, and green light beams respectively. The red light beam has a first field of view 200, the blue light beam has a second field of view 201, and the green light beam has a third field of view 202. The field of view 203 of the multi-wavelength fiber optic imaging device can be the intersection of the first field of view 200, the second field of view 201, and the third field of view 202.

[0107] For example, such as Figure 8As shown, the multiple first beams collimated by the second collimating lens may not be combined before reaching the target tissue. The propagation directions of the multiple first beams intersect each other, and the field of view corresponding to each of the multiple first beams does not completely overlap. The common part of the field of view corresponding to each of the multiple first beams can be intercepted so that multiple first beams of different wavelengths can reach the same area of ​​the target tissue. The same area of ​​the target tissue can provide feedback to the multiple first beams of different wavelengths, thereby improving the imaging quality of the target tissue.

[0108] Figure 11 The diagram shown is a structural schematic of an application scenario for a multi-wavelength fiber optic imaging system according to an embodiment of this application. The multi-wavelength fiber optic imaging device 10 can be applied to the multi-wavelength fiber optic imaging system 1.

[0109] In some embodiments, such as Figure 11 As shown, the multi-wavelength fiber optic imaging device 10 also includes a probe 18, which has a receiving space 180. The receiving space 180 is used to accommodate the second ends 111 of multiple transmission fibers, the scanner 12, and the objective lens 13. By integrating the second ends of multiple transmission fibers, the scanner, and the objective lens into the probe, the probe can protect the aforementioned structure, and the shape and size of the probe can be designed according to actual applications, so that the multi-wavelength fiber optic imaging device can be applied to more application scenarios.

[0110] Exemplarily, the second end of the transmission fiber, the scanner, and the objective lens are all connected to the probe. This allows the probe to support and stabilize these structures. Exemplarily, a multi-wavelength fiber optic imaging device or a probe integrating the second end of the transmission fiber, the scanner, and the objective lens can serve as an endoscope, an in vivo clinical diagnostic tool for observing the internal cavities of animals or humans, and can also serve as a handheld or wearable multi-wavelength fiber optic imaging device.

[0111] Exemplarily, the accommodating space is also used to accommodate collimating optical elements. For example, the accommodating space can also accommodate a first collimating lens, or a second collimating lens. Exemplarily, the accommodating space can also accommodate a first collimating lens and a first beam-combining optical element, or a first collimating lens and a second beam-combining optical element. Exemplarily, the accommodating space can also accommodate a second collimating lens and a third beam-combining optical element.

[0112] like Figure 11 As shown, this application also provides a multi-wavelength fiber optic imaging system 1. The multi-wavelength fiber optic imaging system 1 includes: the multi-wavelength fiber optic imaging device 10 mentioned in any of the above embodiments and a plurality of light sources 40. The plurality of light sources 40 are respectively located on the first beam receiving side 113 of a plurality of transmission fibers, and are used to provide first beams 20 of different wavelengths to the first ends 110 of the plurality of transmission fibers respectively.

[0113] Specifically, the first beam receiving side 113 of the transmission optical fiber is the side of the transmission optical fiber 11 used to receive the first beam 20. Further, the first beam receiving side 113 of the transmission optical fiber is the side of the first end 110 of the transmission optical fiber used to receive the first beam 20. Exemplarily, the light sources 40 and the first beam 20 correspond one-to-one. The number of light sources 40 can be the same as the number of wavelengths of the first beam 20. Exemplarily, the light sources may include continuous lasers, pulsed lasers, or light-emitting diodes.

[0114] For example, a multi-wavelength fiber optic imaging system can be a remote scanning multi-wavelength fiber optic imaging system. The second end of the transmission fiber, the scanner, and the objective lens can be located at the remote end, while the first end of the transmission fiber and the light source can be located at the near end.

[0115] Since the multi-wavelength fiber optic imaging system 1 includes the multi-wavelength fiber optic imaging device 10, the multi-wavelength fiber optic imaging system 1 has all the technical features and effects of the multi-wavelength fiber optic imaging device 10, which will not be repeated here.

[0116] In some applications, the multi-wavelength fiber optic imaging system 1 may also include a module for collecting multiple second beams to convert optical signals into electrical signals and generate an image of the target tissue. Collecting multiple second beams and generating an image of the target tissue using these beams can be achieved using common knowledge or conventional techniques in the art, and will not be elaborated upon here.

[0117] Figure 12 The diagram shown is a structural schematic of an embodiment of this application, applicable to a scenario involving transmission optical fibers and light sources.

[0118] In some embodiments, such as Figure 1 , Figure 11 and Figure 12 As shown, the multi-wavelength fiber optic imaging system 1 also includes at least one coupler 50. The at least one coupler 50 is located between the plurality of light sources 40 and the first end 110 of the corresponding transmission fiber, and is used to couple a first beam 20 provided by at least one light source 40 to the first end 110 of the corresponding transmission fiber.

[0119] For example, the coupler may include a gradient refractive index lens, a spherical lens, an aspherical lens, a cemented lens, or a lens group. For instance, the coupler may be a microscope objective.

[0120] For example, such as Figure 1 and Figure 11As shown, the multi-wavelength fiber optic imaging system 1 may include multiple couplers 50. Each coupler 50, light source 40, and transmission fiber 11 corresponds to a specific fiber. Each coupler 50 can be used to couple a first beam 20 provided by the corresponding light source 40 to the first end 110 of the corresponding transmission fiber. For example, when the parameters such as the mode field diameter and numerical aperture of the multiple transmission fibers differ significantly, each first beam can be coupled to the first end of the corresponding transmission fiber by the corresponding coupler.

[0121] For example, such as Figure 12 As shown, the multi-wavelength fiber optic imaging system 1 may include a coupler 50. The coupler 50 can be used to couple first beams 20 provided by multiple light sources 40 to the first end 110 of the corresponding transmission fiber. For example, when the differences in parameters such as mode field diameter and numerical aperture of the multiple transmission fibers are small, the multiple first beams can be coupled to the first end of the corresponding transmission fiber by the same coupler.

[0122] In some embodiments, such as Figure 12 As shown, the multi-wavelength fiber optic imaging system 1 may further include a second fiber optic ferrule 60. In each transmission fiber 11, the first end 110 of the transmission fiber can be the end of a first end portion 115 of the transmission fiber. The first ends 115 of multiple transmission fibers can be inserted into the same second fiber optic ferrule 60. This achieves the fixation of the first ends 110 of multiple transmission fibers, and is beneficial for reducing the overall circumferential size of the first ends 115 of multiple transmission fibers. It also facilitates the coupling of the first beams 20 provided by multiple light sources 40 to the corresponding first ends 110 of the transmission fibers using the same coupler 50.

[0123] In some embodiments, such as Figure 12 As shown, the multi-wavelength fiber optic imaging system 1 may further include at least one reflector 70. The reflector 70 is located between the light source 40 and the coupler 50 and is used to reflect the first beam 20. By changing the propagation direction of the first beam provided by the light source through the reflector, the angle at which the first beam enters the coupler can be adjusted. This facilitates the entry of different first beams into the first ends of multiple transmission fibers at different locations through the same coupler, thereby improving coupling efficiency by allowing multiple first beams of different wavelengths to be coupled into their corresponding transmission fibers using the same coupler.

[0124] In some embodiments, such as Figure 1 , Figure 11 and Figure 12 As shown, the multi-wavelength fiber optic imaging system 1 may further include at least one optical modulator 80. The optical modulator 80 is located between the light source 40 and the coupler 50 and is used to control the intensity of the first beam 20 provided by the light source 40. The optical modulator can adjust the optical power or intensity of the first beam output by the light source to meet the requirements of the first beam's optical power or intensity for imaging the target tissue.

[0125] For example, the light source 40 and the optical modulator 80 correspond one-to-one. For example, the optical modulator may include an electro-optic crystal modulator, an acousto-optic crystal modulator, or a liquid crystal modulator. For example, the optical modulator may also include a mechanically rotating half-wave plate and a polarization-dependent beam splitter.

[0126] For example, such as Figure 4 As shown, when multiple first beams pass through the first collimating lens, the scanner, and the objective lens in sequence to reach the target tissue, that is, when the multiple first beams collimated by the first collimating lens are not combined before reaching the target tissue, after being collimated by the first collimating lens, the propagation directions of the multiple first beams are parallel and do not coincide, and the centroids of the beams corresponding to the multiple first beams have a small gap and do not coincide.

[0127] Since the overall size of the centroid of the beams corresponding to multiple first beams may be larger than the entrance pupil diameter in a multi-wavelength fiber optic imaging device, at least a portion of the beam corresponding to at least one first beam may be blocked by the aperture stop, resulting in a reduction in the effective optical power of the first beam under the objective lens. In this case, the optical power or intensity of the first beam blocked by the aperture stop can be increased by an optical modulator to compensate for the reduction in the effective optical power of the first beam under the objective lens. This allows for high imaging quality of the target tissue without the multiple first beams collimated by the first collimating lens being combined before reaching the target tissue. Furthermore, the multi-wavelength fiber optic imaging device can eliminate the need for a beam combining optical element, and the entrance pupil diameter can be designed to be smaller, which helps reduce the size and weight of the multi-wavelength fiber optic imaging device, making it suitable for applications with strict size and weight requirements. For example, the multi-wavelength fiber optic imaging device can be used as an endoscope or a wearable multi-wavelength fiber optic imaging device.

[0128] In some embodiments, such as Figure 11 As shown, the objective lens 13 is also used to receive a second beam fed back from the target tissue 30 after the first beam 20 is input into the target tissue 30, and output the second beam to the scanner 12. The scanner 12 is also used to output the received second beam to the second end 111 of the transmission optical fiber. The first end 110 of the transmission optical fiber is also used to output the second beam.

[0129] In some embodiments, such as Figure 11 As shown, the multi-wavelength fiber optic imaging system 1 may further include a second beam collecting module 91. The second beam collecting module 91 is located between the light source 40 and the coupler 50 and is used to collect a second beam. The coupler 50 is also used to couple the second beam output from the first end 110 of the transmission fiber to the second beam collecting module 91.

[0130] For example, such as Figure 11As shown, the second beam collecting module 91 may include a beam splitter 910 and a photoelectric conversion module 911. The beam splitter 910 is located between the coupler 50 and the light source 40, and is capable of transmitting the first beam 20 and reflecting the second beam. The photoelectric conversion module 911 is located on the side of the beam splitter 910 that reflects the second beam, and is used to convert the received second beam into an electrical signal.

[0131] For example, beam splitter 910 may include one or more combinations of optical elements such as dichroic mirror, prism, and grating. For example, photoelectric conversion module 911 may include photodetector.

[0132] For example, the second beam collecting module 91 may further include a condenser lens 912. The condenser lens 912 is located between the beam splitter 910 and the photoelectric conversion module 911, and is used to converge the second beam reflected by the beam splitter 910 to the photoelectric conversion module 911.

[0133] In some embodiments, the multi-wavelength fiber optic imaging system 1 may further include a host 92. The host 92 may integrate a first end 110 of the transmission fiber and a light source 40. The host 92 may also integrate a coupler 50, an optical modulator 80, and a reflector 70. The host 92 may also integrate a second beam collecting module 91.

[0134] For example, a system-on-chip (SOC) or a field-programmable gate array (FPGA) can also be integrated into the host to process the electrical signals provided by the photodetector.

[0135] In some embodiments, the objective lens is also used to receive multiple second beams of different wavelengths. The multi-wavelength fiber optic imaging device may further include a dichroic mirror and an imaging fiber. The dichroic mirror, located between the objective lens and the scanner, is capable of transmitting multiple first beams and reflecting multiple second beams. One end of the imaging fiber is located on the second beam output side of the dichroic mirror, for receiving the multiple second beams reflected by the dichroic mirror, and the other end of the imaging fiber is used to output the multiple second beams of the dichroic mirror, so that the multiple second beams can be collected. The multi-wavelength fiber optic imaging system also includes a photoelectric conversion imaging module, located on the second beam output side of the imaging fiber, for receiving the multiple second beams and converting the received multiple second beams into electrical signals to generate an image of the target tissue.

[0136] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0137] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “featuring,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0138] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0139] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0140] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A multi-wavelength fiber optic imaging device, characterized in that, include: Multiple transmission optical fibers are used to transmit multiple first beams, each of which transmits a first beam with a different wavelength. A first end of each transmission optical fiber is used to receive the first beam, and a second end of each transmission optical fiber is used to output the first beam. A scanner, located on the first beam output side of the plurality of transmission optical fibers, is used to receive the first beam transmitted from the second end of the plurality of transmission optical fibers and change the propagation direction of the plurality of first beams to scan the target tissue using the plurality of first beams. An objective lens, located on the first beam output side of the scanner, is used to focus multiple first beams onto the target tissue to image the target tissue; A collimating optical element, located between the plurality of transmission optical fibers and the scanner, is used to collimate the first beam output from the second ends of the plurality of transmission optical fibers; The collimating optical element includes a first collimating lens, which is located between the plurality of transmission optical fibers and the scanner, and is used to collimate the first beam output from the second end of the plurality of transmission optical fibers. The first collimating lens has multiple first focal points located on the first principal optical axis, and the multiple first focal points correspond to multiple first beams respectively. The second end of the transmission optical fiber corresponding to the first beam is located at the same first focal point corresponding to the first beam, so that the propagation directions of the multiple first beams emitted from the first collimating lens are parallel. On the plane passing through the centerline of the second end of the transmission optical fiber and the first principal optical axis, the orthographic projection of the second end of the transmission optical fiber is located on one side of the first principal optical axis, and the orthographic projection of the first collimating lens is located on the other side of the first principal optical axis. Multiple first beams sequentially pass through a first collimating lens, a scanner, and an objective lens before reaching the target tissue.

2. The multi-wavelength fiber optic imaging device according to claim 1, characterized in that, The first collimating lens includes a lens and / or a lens group with an Abbe number less than a preset value, in order to increase the spacing between adjacent first focal points.

3. The multi-wavelength fiber optic imaging device according to claim 1, characterized in that, Also includes: A first beam combining optical element is located between the first collimating lens and the scanner. The first beam combining optical element has a first refractive surface and a second refractive surface that are parallel to each other. When multiple first beams with parallel propagation directions propagate to the first refractive surface, the incident angle of the first beam is greater than 0° and less than 90°. The multiple first beams can enter the first beam combining optical element from the first refractive surface and exit the first beam combining optical element from the second refractive surface. After the multiple first beams exit from the second refractive surface, the propagation directions of the multiple first beams coincide.

4. The multi-wavelength fiber optic imaging device according to claim 1, characterized in that, Also includes: The second beam combining optical element is located between the first collimating lens and the scanner. The second beam combining optical element includes a plurality of first optical films that are parallel to each other and spaced apart. Each of the plurality of first optical films corresponds one-to-one with a plurality of first beams. Each of the first optical films can reflect the corresponding first beam and transmit the first beams other than the corresponding first beam, so that each of the first beams can reach the corresponding first optical film and that the propagation directions of the plurality of first beams coincide after being reflected by the corresponding first optical film.

5. The multi-wavelength fiber optic imaging device according to claim 1, characterized in that, The collimating optical element includes a second collimating lens, which is located between the plurality of transmission optical fibers and the scanner, and is used to collimate the first beam output from the second end of the plurality of transmission optical fibers. The second collimating lens has a second principal optical axis. Wherein, the extension direction of the rotation axis of each light cone formed by the first light beam emitted from the second end of the transmission optical fiber can be parallel to or coincide with the extension direction of the second main optical axis. The second collimating lens has multiple second focal points and multiple focal planes. The multiple second focal points correspond one-to-one with the multiple first beams. Each focal plane contains one second focal point. The second end of the transmission optical fiber corresponding to the first beam is located at the focal plane corresponding to the same first beam.

6. The multi-wavelength fiber optic imaging device according to claim 5, characterized in that, Also includes: A third beam combining optical element is located between the second collimating lens and the scanner. The third beam combining optical element includes a plurality of second optical films. The normals of the plurality of second optical films are arranged to intersect each other. The plurality of second optical films correspond one-to-one with the plurality of first beams. Each second optical film can reflect the corresponding first beam and transmit the first beam other than the corresponding first beam, so that each first beam can reach the corresponding second optical film and that the propagation directions of the plurality of first beams coincide after being reflected by the corresponding second optical film.

7. The multi-wavelength fiber optic imaging device according to claim 5, characterized in that, Each of the first beams has its own corresponding field of view, and the field of view of the multi-wavelength fiber optic imaging device is the intersection of the field of view corresponding to each of the first beams.

8. The multi-wavelength fiber optic imaging apparatus according to any one of claims 1 to 7, characterized in that, Also includes: The probe has a receiving space for accommodating the second ends of multiple transmission optical fibers, the scanner, and the objective lens.

9. A multi-wavelength fiber optic imaging system, characterized in that, include: The multi-wavelength fiber optic imaging apparatus according to any one of claims 1 to 8; Multiple light sources are located on the first beam receiving side of the multiple transmission optical fibers, respectively, for providing the first beam with a different wavelength to the first end of the multiple transmission optical fibers.

10. The multi-wavelength fiber optic imaging system according to claim 9, characterized in that, Also includes: At least one coupler, located between the plurality of said light sources and the first end of the corresponding transmission optical fiber, is used to couple the first light beam provided by at least one of the said light sources to the first end of the corresponding transmission optical fiber.

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