Photoelectric composite slip ring and nonlinear optical detection equipment and system

Abstract

The invention provides a photoelectric composite slip ring and nonlinear optical detection equipment and system, and relates to the technical field of optics. In order to solve the problem of cable torsion caused by an imaging object in a detection system, a photoelectric composite slip ring is arranged in the detection equipment, so that the detection equipment rotates based on rotation of an imaging probe relative to the photoelectric composite slip ring; therefore, cable torsion caused by rotation of one end is eliminated, so that the imaging probe and the imaging object can relatively freely move in the imaging space. Furthermore, in the nonlinear optical detection equipment, a multi-mode photonic crystal fiber is usually configured to be a multi-mode photonic crystal fiber capable of transmitting exciting light of multiple wavelengths in a target wavelength range, so that in order to avoid influence on light beam propagation of the multi-mode photonic crystal fiber, in an optical alignment structure in a photoelectric composite slip ring, the multi-wavelength exciting light can be transmitted by the multi-mode photonic crystal fiber. The numerical aperture is matched with the optical fiber, and an achromatic lens is additionally arranged, so that the light beam propagation requirement of the multimode photonic crystal optical fiber, especially the propagation requirement of exciting light with different wavelengths, is met.

Description

Technical Field

[0001] The present application relates to the field of biological detection technology, and in particular to a photoelectric composite slip ring and nonlinear optical detection equipment and system. Background Art

[0002] Nonlinear optics generally refers to nonlinear phenomena that occur when intense light (such as laser light) interacts with matter, such as multiphoton fluorescence and second harmonic generation. Detection equipment based on nonlinear optics can be used to detect an object using the "fluorescence signal" generated by nonlinear phenomena to generate a "fluorescence image" of the object.

[0003] In an actual detection process, the detection device is often formed with an imaging probe, which needs to be in direct contact with the imaging object to trigger the nonlinear optical phenomenon of the imaging object and collect fluorescence signals.

[0004] In actual testing, nonlinear optics often require scanning imaging, which takes a long time. Rotation of the imaging object or imaging probe can cause cable twisting, impacting the detection results. For example, when testing equipment is used in biological experiments with live animals such as mice and rabbits, the object's inherent motion (such as rotation) can cause cable twisting, affecting the object's motion.

[0005] Optical slip rings can be used to detangle the aforementioned motion of the imaging object and the rotation of the imaging probe by the operator. However, with the continuous advancement of nonlinear optics, there is a demand for multi-band imaging in current imaging equipment (see, for example, the imaging device described in CN119147464A). However, the optical loss and instability of traditional optical slip rings make them difficult to adapt to this multi-band imaging requirement. Summary of the Invention

[0006] In view of this, the embodiments of the present application provide an optoelectronic composite slip ring and a nonlinear optical detection device and system, which can adapt to the imaging requirements of nonlinear optics by adjusting the numerical aperture of the optoelectronic composite slip ring and adding an achromatic lens group.

[0007] In a first aspect, the present application provides an optoelectronic composite slip ring for a nonlinear optical detection device. The optoelectronic composite slip ring is disposed on an optoelectronic composite cable of the nonlinear optical detection device. The optoelectronic composite cable includes a multimode photonic crystal fiber and at least one metal conductor. The multimode photonic crystal fiber is configured to transmit excitation light of multiple wavelengths within a target wavelength range. The optoelectronic composite slip ring includes a central smooth ring and a hollow electric slip ring. The central smooth ring is disposed at the rotation axis of the hollow electric slip ring. The smooth ring mover end of the central smooth ring is connected to the electric slip ring mover end of the hollow electric slip ring. The smooth ring mover end and the electric slip ring mover end are configured to be driven to rotate relative to the smooth ring stator end and the electric slip ring stator end. The central smooth ring also includes an optical alignment structure disposed between the smooth ring mover end and the smooth ring stator end for transmitting excitation light of multiple wavelengths within the target wavelength range. The numerical aperture of the central smooth ring matches the numerical aperture of the multimode photonic crystal fiber. The optical alignment structure includes an achromatic lens assembly, which is configured to eliminate chromatic aberration of the central smooth ring within the target wavelength range.

[0008] In a second aspect, the present application provides a linear optical detection device, comprising an imaging host, an imaging probe, and the optoelectronic composite slip ring described in the first aspect. The imaging host is configured to release excitation light and generate a detection image based on the returned fluorescence signal. The imaging probe is configured to release excitation light toward the imaging object, triggering a multiphoton fluorescence effect and collecting the fluorescence signal generated by the multiphoton fluorescence effect. The imaging host is connected to the stator end of the optoelectronic composite slip ring, and the imaging probe is connected to the mover end of the optoelectronic composite slip ring. The mover end is coupled to the stator end and driven to rotate relative to the stator end. The optoelectronic composite slip ring comprises a central smooth ring connected to a multimode photonic crystal fiber and a hollow electrical slip ring connected to at least one metal conductor.

[0009] In a third aspect, the present application provides a nonlinear optics-based detection system, comprising the nonlinear optics detection device described in the third aspect and an imaging space for accommodating an imaging object. An imaging probe of the detection device is connected to the imaging object, and an optoelectronic composite slip ring is disposed at an edge of the imaging space based on the connection direction between the imaging probe and the imaging object. The optoelectronic composite slip ring is configured to rotate based on rotation of the imaging probe relative to the optoelectronic composite slip ring.

[0010] Therefore, the optoelectronic composite slip ring and nonlinear optical detection device and system provided by the present application address the problem of cable twisting caused by the imaging object in the detection system. The detection device of the present application is provided with an optoelectronic composite slip ring, which rotates based on the rotation of the imaging probe relative to the optoelectronic composite slip ring to eliminate the cable twisting caused by the rotation of the imaging probe (or the imaging object), allowing the imaging probe and the imaging object to move relatively freely within the imaging space. Furthermore, considering that the multimode photonic crystal fiber in the nonlinear optical detection device is often configured as a multimode photonic crystal fiber capable of transmitting multiple wavelengths of excitation light within the target wavelength range, to avoid affecting the beam propagation of the multimode photonic crystal fiber, the optical alignment structure within the optoelectronic composite slip ring has a numerical aperture that matches that of the optical fiber and an additional achromatic lens is provided to meet the beam propagation requirements of the multimode photonic crystal fiber, especially the propagation requirements of excitation light of different wavelengths. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0012] Figure 1 It is a system schematic diagram of a detection system provided by an exemplary embodiment of the present application.

[0013] Figure 2 Schematic diagram of a longitudinal section of an optoelectronic composite slip ring provided by an exemplary embodiment of the present application.

[0014] Figure 3 1 is a schematic top view of an optoelectronic composite slip ring provided by an exemplary embodiment of the present application.

[0015] Figure 4 It is a schematic diagram of the internal structure of a central smooth ring provided by an exemplary embodiment of the present application.

[0016] Figure 5 It is a structural schematic diagram of an optical fiber connector provided by an exemplary embodiment of the present application.

[0017] Figure 6 It is a side structural schematic diagram of a fiber optic connector provided by an exemplary embodiment of the present application.

[0018] Among them, 10. Detection system; 100. Detection equipment; 200. Imaging space; 300. Imaging object; 110. Imaging host; 120. Imaging probe; 130. Optoelectronic composite slip ring; 131. Central smooth ring; 1311. Smooth ring mover end; 1312. Smooth ring stator end; 1313. Optical alignment structure; 1314. Fiber optic cover plate; 1315. Fiber optic connector; 13151. Limiting structure; 1316. Connector through hole; 13161. Placement section; 13162. Heat dissipation section; 132. Hollow electric slip ring; 133. Drive motor; 134. Flexible connection structure; 140. Optoelectronic composite cable; 141. Multimode photonic crystal fiber. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0020] Application Overview:

[0021] As mentioned above, in a detection device based on nonlinear optics, in order to relieve the cable twisting caused by the rotation of the imaging probe (including the rotation generated when the user uses the imaging probe and the rotation caused by the rotation of the imaging object itself), a photoelectric composite slip ring can be used to relieve the twisting.

[0022] To further illustrate the cable untwisting process based on the optoelectronic composite slip ring, the present application provides a system schematic diagram of a detection system provided with an optoelectronic composite slip ring ( Figure 1 ).

[0023] like Figure 1 As shown, the detection system 10 may include a detection device 100 and an imaging space 200 , wherein an imaging object 300 is disposed in the imaging space 200 .

[0024] The detection device 100 may refer to a device that performs imaging based on nonlinear optical phenomena. Functionally, the detection device 100 includes, but is not limited to, a multiphoton imaging device, a multi-harmonic imaging device, etc. The specific structure of the detection device 100 can be found in the subsequent description.

[0025] Taking multiphoton imaging as an example, during the actual imaging process, when excitation light is released onto the imaging object 300, at least two photons in the excitation light converge at a certain depth within the imaging object 300, thereby stimulating the multiphoton phenomenon of the relevant fluorescent dye or structure, thereby releasing a fluorescent signal. The detection device 100 can form a detection image by changing the imaging position to perform planar scanning and / or depth scanning.

[0026] The imaging space 200 may refer to the space where the imaging object 300 is located, and is generally established based on a physical structure. For example, in a biological experiment, the imaging space 200 may be constructed based on an ecological box that accommodates the experimental object (generally presented as Figure 1 In addition, in practical applications, the imaging space 200 may not be limited to biological experiments. For example, the aforementioned detection device 100 may also be used in human skin testing, and the imaging space 200 only needs to provide support for the optoelectronic composite slip ring of the detection device 100 (such as a support frame). In addition, when the imaging probe of the detection device 100 is configured as a handheld probe, the imaging space formed therein can also be equivalently understood as a side-opening structure (i.e., the optoelectronic composite cable enters the imaging space from the side).

[0027] The imaging object 300 may refer to the detection object of the aforementioned detection system 10. Figure 1 A mouse is used as an example to illustrate the detection and detwisting process. In actual applications, the imaging object 300 may also be other living organisms (such as rabbits, humans, etc.) or partial tissues (such as diseased tissues, body sampled tissues, etc.).

[0028] Taking mice as an example, when using the aforementioned multiphoton imaging equipment for detection, images of the mouse brain can generally be detected. Specifically, a window can be opened in the mouse's head and infiltrated with a fluorescent dye, so that some structures in the mouse brain can be excited by the twin light phenomenon and release fluorescence of different wavelengths, forming a detection image. In practical applications, the detection image of the mouse brain generally reflects structures such as calcium ions, mitochondria, and synapses.

[0029] To further illustrate the untwisting process, the aforementioned detection device 100 further includes an imaging host 110, an imaging probe 120, an optoelectronic composite slip ring 130, and an optoelectronic composite cable 140. The imaging host 110 is located outside the imaging space 200, the optoelectronic composite slip ring 130 is located within the imaging space 200, and the imaging probe 120 is located on the imaging object 300 within the imaging space 200. The optoelectronic composite cable 140 is used to connect the imaging host 110 to the optoelectronic composite slip ring 130, and to connect the imaging probe 120 to the optoelectronic composite slip ring 130.

[0030] The imaging host 110 may be formed by components disposed outside the imaging space 200 , and its main functions may be to release excitation light, generate timing control signals, and generate detection images based on fluorescence signals. It may generally include components such as a laser and a controller.

[0031] The aforementioned imaging probe 120 may refer to a device that contacts the imaging object 300 , and generally needs to form an excitation light path for releasing excitation light to the imaging object 300 and a fluorescence light path for collecting fluorescence optical signals.

[0032] The optoelectronic composite slip ring 130 can be a slip ring assembly capable of simultaneously coupling and rotating optical fibers and metal conductors. The optoelectronic composite slip ring 130 can include a stator end and a mover end. The mover end can be driven (e.g., by a motor) to rotate relative to the stator end. During the relative rotation of the mover end and the stator end, the cables connected to the two ends can maintain a coupled state (i.e., the metal conductors maintain an electrical connection, and the optical fibers remain optically coupled).

[0033] Based on the aforementioned stator and mover ends, the optoelectronic composite cable 140 on the imaging host 110 side can be connected to the stator end, maintaining the stability of the cable between the imaging host 110 and the optoelectronic composite slip ring 130. The optoelectronic composite cable 140 on the imaging probe 120 side can be connected to the mover end and rotate accordingly when the imaging probe 120 rotates, thereby relieving the torsion of the optoelectronic composite cable 140 caused by the imaging probe 120.

[0034] Furthermore, in actual applications, the present applicant has discovered that, to achieve the formation of a detection image, the imaging host 110 often needs to receive a fluorescence signal. Simultaneously, the imaging host 110 needs to release excitation light. Therefore, the optoelectronic composite slip ring 130 needs to simultaneously detwist the fluorescence fiber and the excitation light fiber. To simplify the fluorescence fiber, optoelectronic composite slip ring 130 can perform photoelectric conversion of the fluorescence signal between the optoelectronic composite slip ring 130 and the imaging probe 120. This allows the fluorescence signal transmitted to the imaging host 110 to be transmitted via a metal conductor, while the optoelectronic composite slip ring 130 only needs to detwist the excitation light fiber. The specific optoelectronic conversion process and its device configuration can be found in related art and will not be detailed here.

[0035] As mentioned above, in nonlinear optical detection equipment, as the imaging requirements change, its actual excitation light fiber may need to simultaneously transport excitation light of multiple wavelengths. In order to achieve the transmission of multi-wavelength excitation light, the common solid optical fiber has limited spectral bandwidth, and the detection equipment often requires a highly stable and high-power laser, while the optical fiber can usually only transmit a single wavelength of laser. The detection equipment (such as the detection equipment shown in the aforementioned CN119147464A) can use a multimode photonic crystal fiber for excitation light transmission, so that the multimode photonic crystal fiber can transmit multiple wavelengths of excitation light within the target wavelength range.

[0036] In the field of multiphoton imaging, the aforementioned multimode photonic crystal fiber can be further configured as a hollow-core antiresonant fiber (HC-ARF). This fiber has a two-layer structure: a silica core surrounded by a cladding containing multiple equally spaced air holes. The cladding, which forms the air holes, can form the aforementioned resonant cavity structure, thereby strongly confining the excitation light within the target bandwidth.

[0037] Specifically, in multi-photon imaging, the excitation light is generally 550nm to 1800nm, and the aforementioned multi-mode photonic crystal fiber can be designed to have good performance within the range of 550nm to 1800nm to transmit excitation light beams of multiple wavelengths.

[0038] Therefore, in an actual device, the optoelectronic composite cable 140 may include a multimode photonic crystal fiber and at least one metal conductor, and the multimode photonic crystal fiber transmits multiple wavelengths of excitation light within the target wavelength range. The optical fiber is connected to the smooth ring in the optoelectronic composite slip ring 130 corresponding to the multimode photonic crystal fiber, so that the rotation of the smooth ring enables relative rotation of the multimode photonic crystal fibers at both ends.

[0039] In practical applications, considering the transmission characteristics of multimode photonic crystal fiber, in order to avoid the optoelectronic composite slip ring affecting the transmission characteristics of multimode photonic crystal fiber, the optoelectronic composite slip ring can be optimized from the numerical aperture so that the numerical aperture of the optoelectronic composite slip ring optical system matches the numerical aperture of the multimode photonic crystal fiber to avoid its influence on the transmission of excitation light in the multimode photonic crystal fiber.

[0040] Numerical aperture (NA) is a parameter that measures the light-collecting ability of an optical fiber or optical system and is determined by the refractive index difference between the core and cladding. However, in optical design, dispersion is proportional to the fiber's numerical aperture and transmission distance; that is, the larger the NA, the greater the dispersion. For example, as transmission distance and NA increase, optical pulse broadening becomes more pronounced, leading to signal distortion. This is particularly true for multimode optical fibers (i.e., the aforementioned multimode photonic crystal fibers), where different optical modes have different path lengths, resulting in intermodal dispersion (modal dispersion), which reduces bandwidth and transmission capacity.

[0041] That is, considering that the numerical aperture of multimode photonic crystal fiber in nonlinear optical imaging is often large, when the numerical aperture of the optical system of the optoelectronic composite slip ring matches the numerical aperture of the multimode photonic crystal fiber, it will aggravate the dispersion and affect the transmission of different excitation lights transmitted by the multimode photonic crystal fiber.

[0042] To address the aforementioned problem, additional dispersion compensation can be performed based on the dispersion of the excitation light at the optoelectronic composite slip ring 130 , thereby avoiding additional dispersion on the basis of numerical aperture matching.

[0043] Considering that an alignment structure is often provided between the stator end and the mover end of the smooth ring in the optoelectronic composite slip ring 130 , the aforementioned compensation structure for eliminating chromatic aberration can be provided in the alignment structure to compensate for the dispersion formed by the optoelectronic composite slip ring 130 .

[0044] Furthermore, considering the structural size of the optoelectronic composite slip ring 130 itself, the aforementioned compensation structure for eliminating chromatic aberration can be implemented using a lens assembly. For example, an achromatic lens assembly can be constructed using aspheric lenses. Through optical design, the achromatic lens assembly can be used to eliminate chromatic aberration of the central smooth ring within the target wavelength range.

[0045] In summary, the numerical aperture of the central smooth ring matches that of the multimode photonic crystal fiber. The optical alignment structure includes an achromatic lens assembly, which eliminates chromatic aberration in the central smooth ring within the target wavelength range. This setup can therefore meet the beam propagation requirements of multimode photonic crystal fibers, particularly for propagating excitation light of different wavelengths.

[0046] Exemplary optoelectronic composite slip rings:

[0047] To further describe the internal structure of the optoelectronic composite slip ring, the present application provides a cross-sectional schematic diagram of an optoelectronic composite slip ring ( Figure 2 ). The cross section can be viewed at the center of the optoelectronic composite slip ring along the axial direction of the optoelectronic composite slip ring.

[0048] like Figure 2 As shown, the optoelectronic composite slip ring 130 may include a central smooth ring 131 and a hollow electric slip ring 132. The central smooth ring 131 is arranged at the rotation axis of the hollow electric slip ring 132, and the smooth ring rotor end of the central smooth ring 131 is connected to the electric slip ring rotor end of the hollow electric slip ring 132 to rotate synchronously.

[0049] In order to realize the rotation of the aforementioned central smooth ring 131 and the mover end of the hollow electric slip ring 132, the optoelectronic composite slip ring 130 may further include a drive motor 133, which can be connected to the mover end of the hollow electric slip ring 132 through transmission (such as through a gear transmission connection) to drive the mover end of the hollow electric slip ring 132 to rotate.

[0050] Based on the aforementioned configuration, the central smooth ring 131 only involves coupling with the multimode photonic crystal fiber. Specifically, the stator end of the central smooth ring 131 is connected to the multimode photonic crystal fiber 141 in the optoelectronic composite cable 140 on the imaging host 110 side, and the mover end is connected to the multimode photonic crystal fiber 141 in the optoelectronic composite cable 140 on the imaging probe 120 side. Within the central smooth ring 131, the mover end and the stator end of the central smooth ring 131 can be coupled via a beam alignment module to achieve excitation light transmission during rotation.

[0051] The aforementioned hollow electric slip ring 132 may include multiple coaxial channels, and the same channels at the stator end and the mover end of the hollow electric slip ring 132 may be electrically connected (eg, through contacts, brushes, etc.) to achieve electrical connection during rotation.

[0052] In order to maintain stability during the rotation process, each channel in the hollow electric slip ring 132 and the aforementioned central smooth ring 131 can be coaxially arranged to ensure that their relative positions are stable during the rotation process.

[0053] In some embodiments, the drive motor 133 often experiences sudden changes in the slip ring's rotor when it rotates. This means the drive motor 133 must apply a driving force to shift the slip ring's rotor from a stationary state to a rotating state. Directly rotating the slip ring's rotor during this process could cause a sudden change in the force applied to the center slip ring 131, altering its shape and thus affecting the transmission of excitation light through the center slip ring 131.

[0054] In order to reduce the impact of the driving process on the central smooth ring 131, the present application can connect the central smooth ring 131 and the hollow electric slip ring 132 through a flexible connection, so that when the electric slip ring mover end is driven to rotate, the flexible connection structure 134 is first deformed, and then the central smooth ring 131 is driven, so as to reduce the sudden change in force on the central smooth ring 131 when it is driven to rotate, increase its stability during the rotation process, and ensure the stability of its internal optical path.

[0055] A flexible connection structure is a connection method that allows relative displacement or deformation to reduce stress concentration and improve seismic and impact resistance. The flexible material selected for the flexible connection structure can generally represent an elastic material (rubber, indium steel, organic polymer, etc.) or elastic structure that does not deform under external forces, thereby reducing the stiffness of the connection between the two.

[0056] In some embodiments, considering the setting relationship between the aforementioned central smooth ring 131 and the hollow electric slip ring 132, the structure formed by the aforementioned flexible connection can be recorded as a flexible connection structure 134. The aforementioned flexible connection structure 134 can be set between the inner wall of the electric slip ring rotor end and the outer wall of the smooth ring rotor end, that is, the inner wall of the electric slip ring rotor end and the outer wall of the smooth ring rotor end are connected by a flexible material to drive the smooth ring rotor end to rotate when the electric slip ring rotor end is driven to rotate.

[0057] In some embodiments, to further ensure alignment of the central smooth ring 131 with the rotation axis, the aforementioned flexible connection structures 134 can be centrally symmetrically distributed, allowing the central smooth ring 131 to naturally reside at the rotation axis through physical restraint. Specifically, the flexible connection between the inner wall of the slip ring mover end and the outer wall of the smooth ring mover end is implemented as multiple flexible connection structures. These multiple flexible connection structures are symmetrically positioned along the rotation axis at their installation locations on the outer wall of the smooth ring mover end and on the inner wall of the electric slip ring mover end.

[0058] Specifically, Figure 3 A top view schematic diagram of the optoelectronic composite slip ring is provided, such as Figure 3As shown, three flexible connection structures 134 are provided between the inner wall of the slip ring mover end and the outer wall of the smooth ring mover end. The angles between the three flexible connection structures are all 120°, and they are arranged symmetrically along the center of the rotation axis. Because the three flexible connection structures 134 support the outer wall of the smooth ring mover end, the forces in other directions of the three symmetrical flexible connection structures 134 offset each other, keeping the smooth ring mover end at the center of the rotation axis.

[0059] In some embodiments, to further ensure that the central smooth ring 131 is aligned with the axis of rotation, the central smooth ring 131 (the smooth ring mover end) can be limited in position by field interaction. Specifically, a first limiting structure can be formed on the inner wall of the electric slip ring mover end, and a second limiting structure can be provided on the outer wall of the smooth ring mover end. The first and second limiting structures form an active field (e.g., a magnetic field) to limit the smooth ring mover end to the axis of rotation.

[0060] In some embodiments, the first and second position-limiting structures can also serve as transmission structures to achieve contactless rotational drive. For example, the first and second position-limiting structures can be coupled via a magnetic field to achieve synchronous movement.

[0061] Example connection relationship between multimode photonic crystal fiber and central smooth ring:

[0062] In order to further illustrate the internal structure of the aforementioned center smooth ring 131 and to explain its connection relationship with the multimode photonic crystal fiber, the present application also provides a schematic diagram of the internal structure of the center smooth ring ( Figure 4 ).

[0063] like Figure 4 As shown, based on the central smooth ring 131 being arranged on the multimode photonic crystal fiber 141, the central smooth ring 131 presents itself as a single-channel fiber slip ring. Thus, the central smooth ring 131 may include a smooth ring mover end 1311, a smooth ring stator end 1312, and an optical alignment structure 1313. The smooth ring mover end 1311 and the smooth ring stator end 1312 are respectively connected to different sides of the multimode photonic crystal fiber 141, and the optical alignment structure 1313 is arranged between the smooth ring mover end 1311 and the smooth ring stator end 1312 to achieve alignment and coupling of light beams between the smooth ring mover end 1311 and the smooth ring stator end 1312.

[0064] In conjunction with the transmission requirements of the aforementioned multimode photonic crystal fiber 141, the optical alignment structure 1313 can be used to transmit multiple wavelengths of excitation light within the target wavelength range. In some embodiments, the optical alignment structure 1313 can be symmetrically arranged, with the smooth ring mover end 1311 and the smooth ring stator end 1312 having the same structure.

[0065] As previously mentioned, the transmission requirements of multimode photonic crystal fiber 141 require that the numerical aperture of the central smooth ring match that of the multimode photonic crystal fiber. To eliminate the dispersion caused by the higher numerical aperture, a dispersion compensation structure can be incorporated into optical alignment structure 1313, specifically an achromatic lens assembly. This eliminates chromatic aberration of central smooth ring 131 within the target wavelength range. Based on the symmetrical structure of optical alignment structure 1313, the achromatic lens assembly can also be symmetrically disposed at the smooth ring mover end 1311 and the smooth ring stator end 1312.

[0066] An achromatic lens group is typically composed of lenses made of different materials to correct chromatic aberration and other aberrations. It can generally be presented as a lens group including aspheric lenses, doublets, and triplets. In actual design, material selection (such as special dispersion glass or ordinary glass), structural composition (such as K9 / F2 glass + binary optical elements, the aforementioned doublets, triplets, or hybrid structures), and optical design can be performed as needed. In optical design, the numerical aperture of the achromatic lens group should also match the numerical aperture of the multimode photonic crystal fiber 141, and the wavelength that needs to be corrected can be optimized based on the bandwidth range of the multimode photonic crystal fiber 141.

[0067] In some embodiments, considering that the aforementioned multi-mode photonic crystal fiber 141 often has a hole structure at its edge to constrain the excitation light transmitted therein, in order to prevent the hole structure of the multi-mode photonic crystal fiber 141 from leaking out when the multi-mode photonic crystal fiber 141 is connected to the smooth ring mover end 1311 and the smooth ring stator end 1312, and to prevent foreign matter (such as dust, moisture, etc.) from entering the hole structure, thereby affecting the excitation light transmission capability of the multi-mode photonic crystal fiber 141. A fiber cover 1314 is provided on the side of the smooth ring mover end 1311 and the smooth ring stator end 1312 facing the optical alignment structure 1313. The fiber cover 1314 is used to seal the hole structure of the multi-mode photonic crystal fiber 141.

[0068] That is, the aforementioned optical fiber cover plate 1314 can form a closed space with the surface of the hole structure of the closed multimode photonic crystal fiber 141 , thereby preventing external foreign matter from entering the hole structure of the multimode photonic crystal fiber 141 .

[0069] Considering that the excitation light transmitted in the aforementioned multimode photonic crystal fiber 141 is a high-energy laser, and considering that the high-energy light beam does generate heat when refracted at the interface, the accumulation of this heat may affect the normal use of the multimode photonic crystal fiber 141.

[0070] In order to prevent the heat generated at the fiber cover 1314 when the multi-mode photonic crystal fiber 141 is emitted from affecting the normal use of the multi-mode photonic crystal fiber 141, in actual settings, the multi-mode photonic crystal fiber 141 can be separated from the fiber cover 1314, while maintaining the closed space formed by the aforementioned fiber cover 1314 and the surface of the hole structure that encloses the multi-mode photonic crystal fiber 141.

[0071] To form the aforementioned structure, when the multimode photonic crystal fiber 141 is connected to the smooth ring mover end 1311 and the smooth ring stator end 1312, they can be connected via an optical fiber connector, thereby forming the aforementioned enclosed space and separating the multimode photonic crystal fiber 141 from the optical fiber cover plate 1314. The optical fiber connector can be a connecting structure for connecting optical fibers and is generally made of a ceramic material (such as zirconium dioxide (ZrO2)), also known as an optical fiber ceramic ferrule.

[0072] In some embodiments, the smooth ring mover end 1311 and the smooth ring stator end 1312 can be connected to the optical fiber connector through corresponding sleeves, or the optical fiber connector can be directly fixed to the smooth ring mover end 1311 and the smooth ring stator end 1312.

[0073] In order to further describe the actual structure of the optical fiber connector, the present application also provides a structural diagram of the optical fiber connector ( Figure 5 ), in this structural diagram, the optical fiber connector 1315 is matched with the multimode photonic crystal fiber 141 and is arranged at the smooth ring mover end 1311 and the smooth ring stator end 1312.

[0074] like Figure 5 As shown, the optical fiber connector 1315 is provided with a connector through hole 1316 that passes through the optical fiber connector 1315. The connector through hole 1316 includes a placement section 13161 for placing the multimode photonic crystal fiber and a heat dissipation section 13162 close to the optical alignment structure. The optical fiber cover plate 1314 is provided at one end of the optical fiber connector 1315 close to the optical alignment structure 1313.

[0075] Based on the above structure, when the multimode photonic crystal fiber 141 can be set in the placement section 13161, the heat dissipation section 13162 and the fiber cover 1314 form a sealed heat dissipation structure (that is, a sealed space is formed to separate the multimode photonic crystal fiber 141 from the fiber cover 1314).

[0076] In order to further enhance its heat dissipation capability and prevent the inner wall from affecting the transmission of the excitation light, the aperture size of the heat dissipation section 13162 gradually increases in the direction close to the optical alignment structure 1313. Figure 5 As shown, it can appear as a funnel-shaped structure.

[0077] In some embodiments, to facilitate placement of the multimode photonic crystal fiber 141 within the placement section, and in conjunction with the hole structure at the edge of the multimode photonic crystal fiber 141, the optical fiber connector 1315 is provided with a limiting structure 13151 between the placement section 13161 and the heat dissipation section 13162. In conjunction with the aforementioned hole structure, the limiting structure 13151 can be provided along the inner wall of the optical fiber connector 1315 to support and seal the hole structure of the multimode photonic crystal fiber 141.

[0078] To further illustrate the specific matching relationship between the hole structure of the multimode photonic crystal fiber 141 and the aforementioned optical fiber connector 1315, the present application also provides a side view of the optical fiber connector along the setting direction of the multimode photonic crystal fiber 141 ( Figure 6 ).

[0079] like Figure 6 As shown, the multimode photonic crystal fiber 141 can be supported by a limiting structure 13151 between the heat dissipation section 13162 and the placement section 13161. The limiting structure 13151 can cover the hole structure of the multimode photonic crystal fiber 141, thereby forming a two-layer closure for the hole structure, thereby further preventing foreign matter from entering the hole structure of the multimode photonic crystal fiber 141.

[0080] In addition, considering the transmission requirements of the multimode photonic crystal fiber 141, the aforementioned limiting structure 13151 can avoid the light-emitting area of the multimode photonic crystal fiber 141 and leak out the center of the fiber. In addition, considering that the limiting structure 13151 does not affect the transmission of the excitation light, it can be prepared using translucent materials, semi-translucent materials, and light-shielding materials. In addition, considering the difficulty of the limiting structure 13151 and the optical fiber connector 1315, the optical fiber connector 1315 can be separated from the limiting structure 13151 during actual preparation and connected through a specific structure. For example, at the junction of the heat dissipation section 13162 and the placement section 13161 of the optical fiber connector 1315, the aperture of the heat dissipation section 13162 can be made slightly larger than the aperture of the placement section 13161, thereby forming a step structure to facilitate the placement of the limiting structure 13151.

[0081] All of the above optional technical solutions can be arbitrarily combined to form optional embodiments of the present application, and will not be described in detail here.

[0082] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0083] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0084] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0085] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0086] It should be noted that, in the description of this application, the terms "first," "second," "third," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, "plurality" means two or more.

[0087] It should be noted that "miniaturization" in this application means that the multiphoton microscopy system has little impact on the activities of the living organism to be observed during the observation period. For example, when the multiphoton microscopy system is fixed on the living organism to be observed, the living organism to be observed can still move freely.

[0088] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A photoelectric composite slip ring for nonlinear optical detection equipment, characterized in that: The optoelectronic composite slip ring is arranged on the optoelectronic composite cable of the nonlinear optical detection device, and the optoelectronic composite cable includes a multimode photonic crystal fiber and at least one metal conductor, wherein the multimode photonic crystal fiber is used to transmit multiple wavelength excitation lights within a target wavelength range; The optoelectronic composite slip ring comprises a central smooth ring and a hollow electric slip ring, wherein the central smooth ring is arranged at the rotation axis of the hollow electric slip ring, the smooth ring mover end of the central smooth ring is connected to the electric slip ring mover end of the hollow electric slip ring, and the smooth ring mover end and the electric slip ring mover end are used to be driven to rotate relative to the smooth ring stator end and the electric slip ring stator end; The central smooth ring also includes an optical alignment structure arranged between the smooth ring mover end and the smooth ring stator end, for transmitting multiple wavelengths of excitation light within the target wavelength range. The numerical aperture of the central smooth ring matches the numerical aperture of the multi-mode photonic crystal fiber. The optical alignment structure includes an achromatic lens group, which is used to eliminate the chromatic aberration of the central smooth ring in the target wavelength range.

2. The optoelectronic composite slip ring according to claim 1, characterized in that: A fiber cover is provided on the side of the smooth ring mover end and the smooth ring stator end facing the optical alignment structure, and the fiber cover is used to close the hole structure of the multi-mode photonic crystal fiber.

3. The optoelectronic composite slip ring according to claim 2, characterized in that: The smooth ring mover end and the smooth ring stator end are provided with an optical fiber connector, and the optical fiber connector is provided with a connector through hole penetrating the optical fiber connector; The connector through hole includes a placement section for placing the multimode photonic crystal fiber and a heat dissipation section close to the optical alignment structure, and the optical fiber cover plate is arranged at one end of the optical fiber connector close to the optical alignment structure; When the multi-mode photonic crystal optical fiber is arranged in the placement section, the heat dissipation section and the optical fiber cover plate form a sealed heat dissipation structure.

4. The optoelectronic composite slip ring according to claim 3, characterized in that: The aperture size of the heat dissipation section gradually increases in a direction approaching the optical alignment structure.

5. The optoelectronic composite slip ring according to claim 3, characterized in that: The optical fiber connector is provided with a limiting structure between the heat dissipation section and the placement section; The limiting structure is arranged along the inner wall of the optical fiber connector and is used for supporting and covering the hole structure of the multi-mode photonic crystal optical fiber.

6. The optoelectronic composite slip ring according to claim 1, characterized in that: The optoelectronic composite slip ring further comprises a driving motor, which is drivingly connected to the electric slip ring mover end to drive the electric slip ring mover end to rotate; The inner wall of the electric slip ring mover end is connected to the outer wall of the smooth ring mover end through a flexible material, so as to drive the smooth ring mover end to rotate when the electric slip ring mover end is driven to rotate.

7. The optoelectronic composite slip ring according to claim 6, characterized in that: The optoelectronic composite slip ring further comprises a plurality of flexible connection structures provided between the inner wall of the electric slip ring mover end and the outer wall of the smooth ring mover end; The installation positions of the multiple flexible connection structures on the outer wall of the smooth ring mover end and the installation positions on the inner wall of the electric slip ring mover end are symmetrical along the center of the rotation axis.

8. The optoelectronic composite slip ring according to claim 6, characterized in that: The inner wall of the electric slip ring mover end is also formed with a first limiting structure, and the outer wall of the smooth ring mover end is also provided with a second limiting structure; An action field is formed between the first limiting structure and the second limiting structure, thereby limiting the smooth ring mover end to the rotation axis.

9. A nonlinear optical detection device, characterized in that: The detection equipment includes: An imaging host, used to release excitation light and generate a detection image based on the returned fluorescence signal; An imaging probe, configured to release excitation light to an imaging object to trigger a multiphoton fluorescence effect and collect fluorescence signals generated by the multiphoton fluorescence effect; and The optoelectronic composite slip ring according to any one of claims 1 to 8, wherein the imaging host is connected to the stator end of the optoelectronic composite slip ring, the imaging probe is connected to the mover end of the optoelectronic composite slip ring, the mover end is coupled to the stator end and driven to rotate relative to the stator end, and the optoelectronic composite slip ring includes a central smooth ring connected to a multimode photonic crystal fiber and a hollow electrical slip ring connected to at least one metal conductor.

10. A nonlinear optical detection system, characterized in that: The nonlinear optical detection system comprises: The nonlinear optical detection device according to claim 9; and an imaging space for accommodating an imaging object; The imaging probe of the detection device is connected to the imaging object, and the optoelectronic composite slip ring is arranged at the edge of the imaging space based on the connection direction between the imaging probe and the imaging object; The optoelectronic composite slip ring is configured to rotate based on the rotation of the imaging probe relative to the optoelectronic composite slip ring.

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