Laser scanning imaging method and device, laser imaging equipment and system and medium

Abstract

The invention provides a laser scanning imaging method and device, laser imaging equipment and system and a medium, and relates to the technical field of optical imaging, and the method comprises the steps: obtaining an initial light beam, and dividing the initial light beam into a reference light beam and a detection light beam; scanning the to-be-detected object through the detection light beam, and dynamically adjusting the detection light beam in the scanning process to obtain a scanning reflection light beam corresponding to the to-be-detected object; wherein the scanning reflection light beam is a light beam obtained by carrying out omnibearing scanning on a to-be-detected object at different angles by the detection light beam; combining the reference light beam and the scanning reflection light beam to obtain a light beam interference signal; and determining a laser scanning imaging result of the to-be-measured object according to the light beam interference signal. According to the technical scheme, the to-be-detected object is scanned through the detection light beam, and the to-be-detected object is subjected to omnibearing scanning at different angles through the detection light beam in the scanning process, so that the scanning reflection light beam for omnibearing scanning at different angles of the to-be-detected object is obtained, and the scanning precision of the to-be-detected object is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging, and in particular, to a laser scanning imaging method, device, laser imaging equipment, system and medium. Background Art

[0002] Optical Coherence Tomography (OCT for short) is a newly developed and most promising tomographic imaging technology in recent years. Especially in the in-vivo detection and imaging of biological tissues, it has attractive application prospects and has been applied in many clinical fields such as ophthalmology, dentistry and dermatology, and has developed rapidly in recent years.

[0003] Currently, in the prior art, during the process of scanning a test object by the current OCT inspection instrument, limited by the emitted laser light source and the optical path, the patient can only take a sitting position and put the mandible in the designated position to complete the inspection. This is not very friendly to infants, the elderly and patients with cervical spine lesions. The existing OCT inspection instrument cannot perform an all-round scan of the test object, and the OCT inspection instrument cannot adjust the scanning beam in time according to different test objects, resulting in inaccurate scanning imaging of the test object and reducing the experience of the test object. Summary of the Invention

[0004] The present invention provides a laser scanning imaging method, device, laser imaging equipment, system and medium, which are used to solve the defect that the existing OCT inspection instrument cannot perform an all-round scan of the test object, and the OCT inspection instrument cannot adjust the scanning beam in time according to different test objects, resulting in inaccurate scanning imaging of the test object and reducing the experience of the test object. It realizes scanning the test object with a detection beam and dynamically adjusting the detection beam during the scanning process, so that the detection beam performs an all-round scan of different angles of the test object, thereby obtaining a scanning reflection beam that performs an all-round scan of different angles of the test object, improving the scanning accuracy of the test object and enhancing the experience of the test object.

[0005] The present invention provides a laser scanning imaging method, which is applied to a laser imaging device and includes the following steps.

[0006] Obtain an initial beam and divide the initial beam into a reference beam and a detection beam.

[0007] Scan the test object with the detection beam and dynamically adjust the detection beam during the scanning process to obtain a scanning reflection beam corresponding to the test object; wherein, the scanning reflection beam is a beam that performs an all-round scan of different angles of the test object by the detection beam.

[0008] Combine the reference beam and the scanning reflection beam to obtain a beam interference signal.

[0009] Determine the laser scanning imaging result of the object to be measured according to the beam interference signal.

[0010] According to a laser scanning imaging method provided by the present invention, an initial beam is divided into a reference beam and a detection beam, including: determining a beam division ratio; dividing the initial beam into a reference beam and a detection beam according to the beam division ratio.

[0011] According to a laser scanning imaging method provided by the present invention, the object to be measured is scanned by a detection beam, and the detection beam is dynamically adjusted during the scanning process to obtain a scanned reflected beam corresponding to the object to be measured, including: scanning the object to be measured by the detection beam, and dynamically adjusting the wavelength and power of the detection beam during the scanning process to obtain the reflected beams corresponding to the detection beams with different wavelengths and different powers received by the object to be measured; obtaining the scanned reflected beam corresponding to the object to be measured according to the set of all the reflected beams.

[0012] According to a laser scanning imaging method provided by the present invention, determining the laser scanning imaging result of the object to be measured according to the beam interference signal includes: detecting the beam interference signal to obtain an electrical intensity signal; wherein, the electrical intensity signal is a signal obtained by detecting and converting the beam interference signal; performing a Fourier transform on the electrical intensity signal to determine the laser scanning imaging result of the object to be measured.

[0013] The present invention also provides a laser scanning imaging device, which is applied to a laser imaging device and includes the following modules.

[0014] A beam acquisition module, configured to acquire an initial beam and divide the initial beam into a reference beam and a detection beam.

[0015] An object scanning module, configured to scan the object to be measured by the detection beam and dynamically adjust the detection beam during the scanning process to obtain a scanned reflected beam corresponding to the object to be measured; wherein, the scanned reflected beam is a beam that performs an omnidirectional scan of the object to be measured at different angles by the detection beam.

[0016] A beam combining module, configured to combine the reference beam and the scanned reflected beam to obtain a beam interference signal.

[0017] A result determination module, configured to determine the laser scanning imaging result of the object to be measured according to the beam interference signal.

[0018] The present invention also provides a laser imaging device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the above-mentioned any one of the laser scanning imaging methods is implemented.

[0019] The present invention also provides a laser scanning imaging system, which is characterized by comprising an object to be measured and a laser imaging device; wherein, the laser imaging device comprises a chip-based external cavity laser and a scanning imager.

[0020] According to the laser scanning imaging system provided by the present invention, the scanning imager comprises: an optical interferometer, a laser scanner, and a spectrum analyzer; wherein, the optical interferometer is configured to receive the initial beam emitted by the chip-based external cavity laser and divide the initial beam into a reference beam and a detection beam; the laser scanner is configured to perform scans of different external positions on the object to be measured according to the detection beam to obtain a scanned reflected beam corresponding to the object to be measured; the optical interferometer is further configured to combine the reference beam and the scanned reflected beam to obtain a beam interference signal; the spectrum analyzer is configured to analyze the beam interference signal to obtain a laser scanning imaging result corresponding to the object to be measured.

[0021] According to the laser scanning imaging system provided by the present invention, the chip-based external cavity laser comprises a gain chip, a template matching structure, a wavelength selection structure, and a reflection structure; wherein, the gain chip is configured to generate the initial beam and increase the gain of the initial beam; the template matching structure is configured to reduce the loss between the gain chip and the wavelength selection structure and the reflection structure; the wavelength selection structure is configured to adjust the wavelength of the detection beam in the case of performing scans of different external positions on the object to be measured according to the detection beam; the reflection structure is configured to adjust the power of the detection beam in the case of performing scans of different external positions on the object to be measured according to the detection beam.

[0022] The present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements any one of the above laser scanning imaging methods.

[0023] The present invention also provides a computer program product, comprising a computer program, and when the computer program is executed by a processor, it implements any one of the above laser scanning imaging methods.

[0024] A laser scanning imaging method, device, laser imaging device, system and medium provided by the present invention are applied to a laser imaging device. The method includes obtaining an initial light beam and dividing the initial light beam into a reference light beam and a detection light beam; scanning a to-be-detected object with the detection light beam and dynamically adjusting the detection light beam during the scanning process to obtain a scanned reflection light beam corresponding to the to-be-detected object, where the scanned reflection light beam is a light beam that performs an omnidirectional scan of the to-be-detected object at different angles; combining the reference light beam and the scanned reflection light beam to obtain a light beam interference signal; and determining a laser scanning imaging result of the to-be-detected object according to the light beam interference signal. The technical solution of the present invention is used to solve the defects in the prior art that an OCT inspection instrument cannot perform an omnidirectional scan of a to-be-detected object, and the OCT inspection instrument cannot timely adjust the scanning light beam according to different to-be-detected objects, resulting in inaccurate scanning imaging of the to-be-detected object and reducing the experience of the to-be-detected object. The present invention realizes scanning the to-be-detected object with the detection light beam and dynamically adjusting the detection light beam during the scanning process, so that the detection light beam performs an omnidirectional scan of the to-be-detected object at different angles, thereby obtaining a scanned reflection light beam that performs an omnidirectional scan of the to-be-detected object at different angles, improving the scanning accuracy of the to-be-detected object and enhancing the experience of the to-be-detected object. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 is a schematic flowchart of the laser scanning imaging method provided by the present invention.

[0027] Figure 2 is a schematic structural diagram of the laser scanning imaging device provided by the present invention.

[0028] Figure 3 is a schematic structural diagram of the laser imaging device provided by the present invention.

[0029] Figure 4 is one of the schematic structural diagrams of the laser scanning imaging system provided by the present invention.

[0030] Figure 5 is the other schematic structural diagram of the laser scanning imaging system provided by the present invention.

[0031] REFERENCE MARKS: 4: Laser scanning imaging system; 40: Object to be measured; 41: Laser imaging device; 411: Chip-based external cavity laser; 4111: Gain chip; 4112: Template matching structure; 4113: Wavelength selection structure; 4114: Reflection structure; 412: Scanning imager; 4121: Optical interferometer; 4122: Laser scanner; and 4123: Spectrum analyzer. Detailed implementation manners

[0032] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0033] The following Figure 1 describes the laser scanning imaging method provided by the present invention. The laser scanning imaging method provided by the present invention is applicable to the scanning imaging of an object to be measured. The execution subject of this method can be a laser imaging device or a laser scanning imaging device provided in the laser imaging device. The laser scanning imaging device can be implemented by software, hardware, or a combination of both. Figure 1 is a schematic flowchart of the laser scanning imaging method provided by the present invention. As Figure 1 shown, the method includes the following steps 101, 102, 103, and 104.

[0034] Step 101: Obtain an initial light beam and divide the initial light beam into a reference light beam and a detection light beam.

[0035] In this step, the initial wavelength refers to the light beam generated by the forward bias injection current of the gain chip in the chip-based external cavity laser in the laser imaging device through the processes of spontaneous emission, stimulated emission, and resonant frequency selection in the chip-based external cavity laser. The detection light beam refers to the light beam used to scan the object to be measured, and the reference light beam refers to the light beam used to compare the light beam after scanning the object to be measured.

[0036] Specifically, obtain the forward bias injection current of the gain chip in the chip-based external cavity laser in the laser imaging device, generate the initial light beam through the processes of spontaneous emission, stimulated emission, and resonant frequency selection in the chip-based external cavity laser, and divide the initial light beam into a reference light beam and a detection light beam.

[0037] In a specific implementation manner, dividing the initial light beam into a reference light beam and a detection light beam includes: determining the light beam division ratio; and dividing the initial light beam into a reference light beam and a detection light beam according to the light beam division ratio.

[0038] In this step, the beam division ratio is a pre-set ratio for dividing the initial beam. The beam division ratio is usually related to the object attribute of the object to be measured. For example, if the object attribute of the object to be measured is attribute A, for example, the beam division ratio of the reference beam and the detection beam can be 1:1. For example, if the object attribute of the object to be measured is attribute B, for example, the beam division ratio of the reference beam and the detection beam can be 1:2. This embodiment does not limit this.

[0039] Specifically, determine the object attribute of the object to be measured, determine the beam division ratio according to the object attribute, and then divide the initial beam into a reference beam and a detection beam through the beam division ratio.

[0040] Step 102: Scan the object to be measured with the detection beam and dynamically adjust the detection beam during the scanning process to obtain the scanned reflected beam corresponding to the object to be measured.

[0041] In this step, the scanned reflected beam is the beam that scans the object to be measured from different angles in all directions by the detection beam.

[0042] Specifically, after dividing the initial beam to obtain the detection beam, scan the object to be measured according to the detection beam, and dynamically adjust the detection beam during the scanning process, continuously adjust the wavelength and power of the detection beam, so as to realize scanning the object to be measured from different angles in all directions and obtain the scanned reflected beam corresponding to the object to be measured.

[0043] In a specific embodiment, scanning the object to be measured with the detection beam and dynamically adjusting the detection beam during the scanning process to obtain the scanned reflected beam corresponding to the object to be measured includes: scanning the object to be measured with the detection beam and dynamically adjusting the wavelength and power of the detection beam during the scanning process to obtain the reflected beams corresponding to the object to be measured receiving the detection beams with different wavelengths and different powers; obtaining the scanned reflected beam corresponding to the object to be measured according to the set of all the reflected beams.

[0044] Specifically, scan the object to be measured with the detection beam and dynamically adjust the wavelength and power of the detection beam during the scanning process to obtain the reflected beams corresponding to the object to be measured receiving the detection beams with different wavelengths and different powers; then obtain the scanned reflected beam corresponding to the object to be measured according to the set of all the reflected beams.

[0045] Step 103: Combine the reference beam and the scanned reflected beam to obtain a beam interference signal.

[0046] In this step, combining means fusing the reference beam and the scanned reflected beam, and usually a beam splitter or a beam combiner is used for combining processing. This embodiment does not limit this.

[0047] Specifically, after obtaining the scanned reflected light beam, a beam splitter or a beam combiner is used to combine the scanned reflected light beam and the reference light beam to obtain a light beam interference signal.

[0048] Step 104: Determine the laser scanning imaging result of the object to be measured according to the light beam interference signal.

[0049] Specifically, after obtaining the combined light beam interference signal, determine the laser scanning imaging result of the object to be measured according to the light beam interference signal.

[0050] In a specific embodiment, determining the laser scanning imaging result of the object to be measured according to the light beam interference signal includes: detecting the light beam interference signal to obtain an electrical intensity signal; wherein, the electrical intensity signal is a signal obtained by detecting and converting the light beam interference signal; performing a Fourier transform on the electrical intensity signal to determine the laser scanning imaging result of the object to be measured.

[0051] Specifically, detect the light beam interference signal, convert the light beam interference signal into an electrical intensity signal, then perform a Fourier transform on the electrical intensity signal, and combine different wavelengths to obtain the corresponding intensity and phase at the corresponding wavelength at different wavelengths. According to the correlation relationship between the intensity and the response, reconstruct the internal structure and tissue information of the object to be measured, so as to obtain the laser scanning imaging result of the object to be measured.

[0052] A laser scanning imaging method provided by the present invention is applied to a laser imaging device. By obtaining an initial light beam and dividing the initial light beam into a reference light beam and a detection light beam; scanning the object to be measured with the detection light beam and dynamically adjusting the detection light beam during the scanning process to obtain a scanned reflected light beam corresponding to the object to be measured; wherein, the scanned reflected light beam is a light beam that performs an omnidirectional scan of the object to be measured at different angles by the detection light beam; combining the reference light beam and the scanned reflected light beam to obtain a light beam interference signal; determining the laser scanning imaging result of the object to be measured according to the light beam interference signal. The technical solution of the present invention is used to solve the defects in the prior art that the OCT inspection instrument cannot perform an omnidirectional scan of the object to be measured, and the OCT inspection instrument cannot adjust the scanning light beam in a timely manner according to different objects to be measured, resulting in inaccurate scanning imaging of the object to be measured and reducing the experience of the object to be measured. It realizes scanning the object to be measured with the detection light beam and dynamically adjusting the detection light beam during the scanning process, so that the detection light beam performs an omnidirectional scan of the object to be measured at different angles, thereby obtaining a scanned reflected light beam that performs an omnidirectional scan of the object to be measured at different angles, improving the scanning accuracy of the object to be measured and enhancing the experience of the object to be measured.

[0053] The laser scanning imaging device provided by the present invention will be described below. The laser scanning imaging device described below can be mutually referred to the laser scanning imaging method described above.

[0054] Figure 2 is a schematic structural diagram of the laser scanning imaging device provided by the present invention. Refer to Figure 2 As shown in the figure, the laser scanning imaging device 200 is applied to a laser imaging device. The laser scanning imaging device 200 includes: a light beam acquisition module 201, an object scanning module 202, a light beam combining module 203, and a result determination module 204.

[0055] The light beam acquisition module 201 is configured to acquire an initial light beam and divide the initial light beam into a reference light beam and a detection light beam.

[0056] The object scanning module 202 is configured to scan a to-be-detected object with the detection light beam and dynamically adjust the detection light beam during the scanning process to obtain a scanned reflected light beam corresponding to the to-be-detected object; wherein, the scanned reflected light beam is a light beam obtained by the detection light beam performing an omnidirectional scan on the to-be-detected object at different angles.

[0057] The light beam combining module 203 is configured to combine the reference light beam and the scanned reflected light beam to obtain a light beam interference signal.

[0058] The result determination module 204 is configured to determine the laser scanning imaging result of the to-be-detected object according to the light beam interference signal.

[0059] In an exemplary embodiment, the light beam acquisition module 201 divides the initial light beam into a reference light beam and a detection light beam, and specifically is configured to: determine a light beam division ratio; divide the initial light beam into a reference light beam and a detection light beam according to the light beam division ratio.

[0060] In an exemplary embodiment, the object scanning module 202 is specifically configured to: scan a to-be-detected object with the detection light beam and dynamically adjust the wavelength and power of the detection light beam during the scanning process to obtain reflected light beams corresponding to the to-be-detected object receiving detection light beams with different wavelengths and different powers; obtain the scanned reflected light beam corresponding to the to-be-detected object according to the set of all the reflected light beams.

[0061] In an exemplary embodiment, the result determination module 204 is specifically configured to: detect the light beam interference signal to obtain an electrical intensity signal; wherein, the electrical intensity signal is a signal obtained by converting the detection of the light beam interference signal; perform a Fourier transform on the electrical intensity signal to determine the laser scanning imaging result of the to-be-detected object.

[0062] The device in this embodiment can be used to execute the method of any one of the method embodiments of the laser scanning imaging method. Its specific implementation process and technical effects are similar to those in the method embodiments of the laser scanning imaging method. Specifically, reference can be made to the detailed introduction in the method embodiments of the laser scanning imaging method, which will not be elaborated here.

[0063] Figure 3 is a schematic structural diagram of the laser imaging device provided by the present invention, asFigure 3 As shown in Figure 3 , the laser imaging device may include: a processor 310, a communications interface 320, a memory 330, and a communication bus 340. Among them, the processor 310, the communications interface 320, and the memory 330 complete communication with each other through the communication bus 340. The processor 310 may call logic instructions in the memory 330 to execute a laser scanning imaging method, which includes: obtaining an initial light beam and dividing the initial light beam into a reference light beam and a detection light beam; scanning a to-be-detected object with the detection light beam and dynamically adjusting the detection light beam during the scanning process to obtain a scanned reflection light beam corresponding to the to-be-detected object; wherein, the scanned reflection light beam is a light beam that performs an omnidirectional scan of the to-be-detected object at different angles by the detection light beam; combining the reference light beam and the scanned reflection light beam to obtain a light beam interference signal; and determining a laser scanning imaging result of the to-be-detected object according to the light beam interference signal.

[0064] In addition, when the logic instructions in the above-mentioned memory 330 are implemented in the form of software function units and sold or used as independent products, they may be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, may be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in various embodiments of the present invention. The foregoing storage medium includes: various media such as a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disc that can store program codes.

[0065] Figure 4 is one of the structural schematic diagrams of the laser scanning imaging system provided by the present invention. As Figure 4 shown in Figure 4 , the laser scanning imaging system 4 includes a to-be-detected object 40 and a laser imaging device 41. Figure 5 is the second structural schematic diagram of the laser scanning imaging system provided by the present invention. As Figure 5 shown in Figure 5 , wherein, the laser imaging device 41 includes a chip-based external cavity laser 411 and a scanning imager 412.

[0066] The scanning imager 412 includes: an optical interferometer 4121, a laser scanner 4122, and a spectrum analyzer 4123.

[0067] Among them, an optical interferometer is used to receive the initial beam emitted by the chip-based external cavity laser and divide the initial beam into a reference beam and a detection beam; a laser scanner is used to scan the object to be measured at different positions according to the detection beam to obtain the scanned reflected beam corresponding to the object to be measured; the optical interferometer is also used to combine the reference beam and the scanned reflected beam to obtain a beam interference signal; a spectrum analyzer is used to analyze the beam interference signal to obtain the laser scanning imaging result corresponding to the object to be measured.

[0068] In this step, in the scanning imager, the specific interference part is composed of an optical interferometer, a laser scanner, and the object to be measured, and the measurement part is composed of an optical interferometer and a laser scanner. The optical interferometer is used to receive the initial beam of the chip-based external cavity laser and divide the initial beam into two parts through a beam splitter. One part is used as the reference beam, and the other part is used as the detection beam and input into the laser scanner to obtain the scanned reflected beam. The scanned reflected beam and the reference beam are combined to perform interference to obtain the beam interference signal. The laser scanner is used to be able to achieve the offset of the light propagation direction, so as to achieve the scanning of different positions of the object to be measured. The spectrum analyzer is used to restore the corresponding laser scanning imaging result of the object to be measured by analyzing the intensity and phase information of the beam interference signal obtained by laser interference in the optical interferometer. The laser scanning imaging result includes the depth information and tomographic image of the object to be measured.

[0069] The chip-based external cavity laser 411 includes a gain chip 4111, a template matching structure 4112, a wavelength selection structure 4113, and a reflection structure 4114.

[0070] Among them, the gain chip is used to generate the initial beam and increase the gain of the initial beam; the template matching structure is used to reduce the loss between the gain chip and the wavelength selection structure and the reflection structure; the wavelength selection structure is used to adjust the wavelength of the detection beam when scanning the object to be measured at different positions according to the detection beam; the reflection structure is used to adjust the power of the detection beam when scanning the object to be measured at different positions according to the detection beam. The wavelength selection structure and the reflection structure are the external cavity structures of the chip-based external cavity laser.

[0071] In this step, the chip-based external cavity laser can be used as a tunable light source, with the gain chip, the template matching structure, the wavelength selection structure, and the reflection structure as the basic components. The gain chip provides gain for the laser imaging device and can quickly amplify the seed light when the seed light is generated due to quantum fluctuations in the chip-based external cavity laser.

[0072] The advantage of such a setting is that by integrating the gain chip, the use of external optical elements is reduced, and the complexity of the system is lowered. This integrated design reduces the difficulty of optical path alignment, improves the mechanical stability of the system, and thus enhances the long-term stability and reliability of the system. It solves the defect of traditional external cavity lasers that due to the need for multiple discrete components, such as gratings, lenses, etc., the alignment and fixation of these components may lead to poor system stability and susceptibility to environmental changes.

[0073] The template matching structure is used to reduce the loss between the gain chip, the wavelength selection structure and the reflection structure, thereby increasing the output power of the chip-based external cavity laser. The reflection structure is used to form the resonant cavity of the chip-based external cavity laser, enabling resonant enhancement within the chip-based external cavity laser, and thus realizing the output of high-coherence and high-power light. The wavelength selection structure is used to perform wavelength-tunable filtering on the detection beam, and further to control the resonant wavelength of the chip-based external cavity laser, realizing the single-wavelength output of the chip-based external cavity laser. At the same time, by adjusting the wavelength selection structure, the switching and scanning of the resonant wavelength of the chip-based external cavity laser can be achieved. By designing a wide-spectrum tuning structure, such as a cascaded microring structure with a certain width difference, a large-range tuning of the resonant wavelength can be realized.

[0074] The advantage of such a setting is that the chip-based external cavity laser combines the narrow linewidth and wide tuning characteristics of the wavelength selection structure and the reflection structure. By precisely controlling the external cavity length and reflectivity, an extremely narrow linewidth and a relatively wide wavelength tuning range can be achieved, which is beneficial to improving the resolution and depth of imaging.

[0075] Specifically, by forward-biasing and injecting current into the gain chip in the chip-based external cavity laser, an initial light beam is generated through the processes of spontaneous emission, stimulated emission, and resonant frequency selection in the laser. The initial light beam is sent to an optical interferometer, which divides the initial light beam into a reference beam and a detection beam in a certain proportion through a beam splitter or an optical beam splitter. The splitting ratio is usually related to the properties of the object to be measured to achieve better interference quality. Then, the optical interferometer sends the detection beam to a laser scanner. The laser scanner uses structures such as the movement of galvanometric mirrors and rotating mirrors or the adjustment of an optical phased array to cause a directional shift in the light beam propagation path, enabling the light beam to propagate to different positions in the cross-sectional direction of the object to be measured, thereby completing the two-dimensional scanning of the object to be measured. During the scanning process, the wavelength and power of the detection beam output by the chip-based external cavity laser are adjusted through a template matching structure, a wavelength selection structure, and a reflection structure to obtain the scanned reflection beam reflected by the object to be measured after receiving light beams of different wavelengths, and the scanned reflection beam is fed back to the optical interferometer by the laser scanner. The optical interferometer combines the reference beam and the scanned reflection beam through methods such as a beam splitter and a beam combiner to obtain the beam interference signal of the two, and then uses a photodetector to detect the beam interference signal and convert the optical interference signal into an electrical intensity signal. The electrical intensity signal is input into a spectrum analyzer, and the Fourier transform is performed on the signals at different times. Combining the wavelength information of the chip-based external cavity laser at different times, the responses of the object to be measured to the light beams of the corresponding wavelengths in terms of intensity and phase are obtained. According to the correlation between this response and the depth information, the internal structure and tissue information at different depths and different cross-sectional positions of the detected object are reconstructed, thereby obtaining the corresponding laser scanning imaging result of the object to be measured.

[0076] The advantages of such a setting are as follows. The chip-based external cavity laser has good coherence and a narrower fundamental linewidth, which helps to improve the imaging quality and signal detection distance of the laser scanning imaging system. The chip-based external cavity laser has the potential for wide wavelength tuning, which is a significant advantage for OCT applications that require imaging at different depths and different tissue types. The chip-based external cavity laser can achieve single-mode output and a large side-mode suppression ratio, which helps to reduce noise during imaging and improve imaging quality. The chip-based external cavity laser is small in size and easy to be coupled with optical fibers, which helps to improve the integration of the laser scanning imaging system and achieve more portable and reliable measurements.

[0077] A laser scanning imaging system provided by the present invention, the laser scanning imaging system includes an object to be measured and a laser imaging device. Among them, the laser imaging device includes a chip-based external cavity laser and a scanning imager. The scanning imager includes: an optical interferometer, a laser scanner, and a spectrum analyzer. The chip-based external cavity laser includes a gain chip, a template matching structure, a wavelength selection structure, and a reflection structure. The technical solution of the present invention is used to solve the defects in the prior art that the OCT inspection instrument cannot perform an all-round scan of the object to be measured, and the OCT inspection instrument cannot adjust the scanning beam in a timely manner according to different objects to be measured, resulting in inaccurate scanning imaging of the object to be measured and reducing the experience of the object to be measured. It realizes scanning the object to be measured with a detection beam and dynamically adjusting the detection beam during the scanning process, so that the detection beam performs an all-round scan of different angles of the object to be measured, thereby obtaining a scanning reflection beam that performs an all-round scan of different angles of the object to be measured, improving the scanning accuracy of the object to be measured, and enhancing the experience of the object to be measured.

[0078] On the other hand, the present invention also provides a computer program product, the computer program product includes a computer program, the computer program can be stored on a non-transitory computer-readable storage medium, and when the computer program is executed by a processor, the computer can execute the laser scanning imaging method provided by each of the above methods. The method includes: obtaining an initial beam and dividing the initial beam into a reference beam and a detection beam; scanning the object to be measured with the detection beam and dynamically adjusting the detection beam during the scanning process to obtain a scanning reflection beam corresponding to the object to be measured; wherein, the scanning reflection beam is a beam that performs an all-round scan of different angles of the object to be measured by the detection beam; combining the reference beam and the scanning reflection beam to obtain a beam interference signal; determining the laser scanning imaging result of the object to be measured according to the beam interference signal.

[0079] In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it realizes the laser scanning imaging method provided by each of the above methods. The method includes: obtaining an initial beam and dividing the initial beam into a reference beam and a detection beam; scanning the object to be measured with the detection beam and dynamically adjusting the detection beam during the scanning process to obtain a scanning reflection beam corresponding to the object to be measured; wherein, the scanning reflection beam is a beam that performs an all-round scan of different angles of the object to be measured by the detection beam; combining the reference beam and the scanning reflection beam to obtain a beam interference signal; determining the laser scanning imaging result of the object to be measured according to the beam interference signal.

[0080] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative work.

[0081] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A laser scanning imaging method, characterized in that, Applied to a laser imaging device, including: Obtain an initial light beam and divide the initial light beam into a reference light beam and a detection light beam; Scan a to-be-detected object with the detection light beam and dynamically adjust the detection light beam during the scanning process to obtain a scanned reflected light beam corresponding to the to-be-detected object; wherein, the scanned reflected light beam is a light beam that the detection light beam performs an omnidirectional scan on the to-be-detected object at different angles; Combine the reference light beam and the scanned reflected light beam to obtain a light beam interference signal; Determine the laser scanning imaging result of the to-be-detected object according to the light beam interference signal.

2. The laser scanning imaging method according to claim 1, characterized in that, The dividing the initial light beam into a reference light beam and a detection light beam includes: Determine a light beam division ratio; Divide the initial light beam into the reference light beam and the detection light beam according to the light beam division ratio.

3. The laser scanning imaging method according to claim 1, wherein Scanning a to-be-detected object with the detection light beam and dynamically adjusting the detection light beam during the scanning process to obtain a scanned reflected light beam corresponding to the to-be-detected object includes: Scan a to-be-detected object with the detection light beam and dynamically adjust the wavelength and power of the detection light beam during the scanning process to obtain reflected light beams corresponding to the detection light beam with different wavelengths and different powers received by the to-be-detected object; Obtain the scanned reflected light beam corresponding to the to-be-detected object according to the set of all the reflected light beams.

4. The laser scanning imaging method according to claim 1, wherein The determining the laser scanning imaging result of the to-be-detected object according to the light beam interference signal includes: Detect the light beam interference signal to obtain an electrical intensity signal; wherein, the electrical intensity signal is a signal obtained by detecting and converting the light beam interference signal; Perform a Fourier transform on the electrical intensity signal to determine the laser scanning imaging result of the to-be-detected object.

5. A laser scanning imaging device, characterized in that, Applied to a laser imaging device, including: A light beam acquisition module, configured to obtain an initial light beam and divide the initial light beam into a reference light beam and a detection light beam; An object scanning module, configured to scan a to-be-detected object with the detection light beam and dynamically adjust the detection light beam during the scanning process to obtain a scanned reflected light beam corresponding to the to-be-detected object; wherein, the scanned reflected light beam is a light beam that the detection light beam performs an omnidirectional scan on the to-be-detected object at different angles; A light beam combination module, configured to combine the reference light beam and the scanned reflected light beam to obtain a light beam interference signal; A result determination module, configured to determine the laser scanning imaging result of the to-be-detected object according to the light beam interference signal.

6. A laser imaging device, comprising a memory, a processor, and a computer program stored on the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements the laser scanning imaging method according to any one of claims 1 to 4.

7. A laser scanning imaging system, characterized in that, Including a to-be-detected object and the laser imaging device according to claim 6; wherein, the laser imaging device includes a chip-external cavity laser and a scanning imager.

8. The laser scanning imaging system according to claim 7, wherein, The scanning imager includes: an optical interferometer, a laser scanner, and a spectrum analyzer; wherein, The optical interferometer is configured to receive an initial light beam emitted by the chip-external cavity laser and divide the initial light beam into a reference light beam and a detection light beam; The laser scanner is configured to perform scans at different positions on the to-be-detected object according to the detection light beam to obtain a scanned reflected light beam corresponding to the to-be-detected object; The optical interferometer is also used to combine the reference beam and the scanned reflected beam to obtain a beam interference signal; The spectrum analyzer is used to analyze the beam interference signal to obtain a laser scanning imaging result corresponding to the object to be measured.

9. The laser scanning imaging system according to claim 8, wherein, The chip-based external cavity laser includes a gain chip, a template matching structure, a wavelength selection structure, and a reflection structure; wherein, The gain chip is used to generate the initial beam and increase the gain of the initial beam; The template matching structure is used to reduce the loss between the gain chip and the wavelength selection structure and the reflection structure; The wavelength selection structure is used to adjust the wavelength of the detection beam when the object to be measured is scanned in different external positions according to the detection beam; The reflection structure is used to adjust the power of the detection beam when the object to be measured is scanned in different external positions according to the detection beam.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the laser scanning imaging method according to any one of claims 1 to 4.

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