An optical path adjustment device for the reference arm of an OCT system

Abstract

This utility model relates to the technical field of OCT measurement equipment, and discloses a reference arm optical path adjustment device and its usage method for an OCT system. The device comprises a first plane mirror and a second plane mirror, both mounted on a rotating platform via a rotating base. The first and second plane mirrors are arranged parallel to each other. A beam guiding structure and a beam reflecting structure are slidably mounted at both ends of a longitudinal sliding module, which is mounted on a base. The incident beam from the light source provides the light source and sequentially passes through the light source collimating structure, the first plane mirror, the second plane mirror, the beam guiding structure, and the beam reflecting structure. The reference beam from the beam reflecting structure sequentially passes through the beam guiding structure, the second plane mirror, the first plane mirror, the light source collimating structure, and the light source providing structure. This utility model successfully achieves ultra-wide-range, continuous, and precise adjustment of the reference arm optical path within a small volume, possessing advantages such as ingenious structure, low cost, high reliability, and ease of operation.

Description

Technical Field

[0001] This utility model relates to the technical field of OCT measurement equipment, and in particular to a reference arm optical path adjustment device for an OCT system. Background Technology

[0002] Optical Coherence Tomography (OCT), a 3D measurement technology, has been widely used in biomedical and industrial inspection. Based on the Michelson interferometry principle, OCT technology requires splitting the light beam into two paths: one for the sample arm and one for the reference arm. Because a broadband light source is used, the optical paths of the two returning beams are similar, generating an interference signal. The morphological information of the sample is then demodulated from the interference signal. In recent years, this technology has been applied to process monitoring in laser manufacturing. In this application, the OCT scanning head is combined with a laser head; that is, the laser head's optical path becomes part of the sample arm, resulting in a longer optical path for the sample arm, sometimes reaching up to 1 meter.

[0003] An existing technology provides an automatically adjustable reference arm for OCT measurements, used in laser processing OCT monitoring systems for optical path adjustment. The light beam enters through a collimating structure, is reflected by multiple right-angle mirrors (each mirror reflecting the beam once), and finally exits through the port of the light source receiver. The optical path is adjusted by changing the distance between the right-angle mirrors at both ends of a slide rail, but this adjustment range is limited. Achieving a wider range of optical path adjustment requires increasing the slide rail length or the number of right-angle mirrors, both of which increase the overall size of the device. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a reference arm optical path adjustment device for an OCT system.

[0005] The objective of this invention is achieved through the following technical solution: A reference arm optical path adjustment device for an OCT system includes a light source providing structure, a light source collimating structure, an optical waveguide structure, a longitudinal sliding module, a beam guiding structure, a beam reflecting structure, and a base. The optical waveguide structure includes a rotating stage, a first plane mirror, and a second plane mirror. Both the first and second plane mirrors are mounted on the rotating stage via a rotating base, and are arranged parallel to each other. The beam guiding structure and the beam reflecting structure are slidably mounted at both ends of the longitudinal sliding module, which is mounted on the base. The incident beam from the light source providing structure sequentially passes through the light source collimating structure, the first plane mirror, the second plane mirror, the beam guiding structure, and the beam reflecting structure. The reference beam from the beam reflecting structure sequentially passes through the beam guiding structure, the second plane mirror, the first plane mirror, the light source collimating structure, and the light source providing structure. This device can adjust the optical path by rotating the optical waveguide structure, and achieve fine-tuning / micro-adjustment of the optical path by displacing the beam guiding structure and the beam reflecting structure through the longitudinal sliding module. Each component performs its own function, working together to achieve precise and flexible control of a wide range of optical paths within a compact space.

[0006] Preferably, the optical waveguide structure further includes a transverse slide rail, a first lens holder, a second lens holder, and a transverse fixing seat. The first plane mirror is mounted on the first lens holder, and the second plane mirror is mounted on the second lens holder. The first lens holder is slidably connected to one end of the transverse slide rail via a transverse slider, and the second lens holder is slidably connected to the other end of the transverse slide rail via a transverse slider. The transverse slider is connected to the transverse fixing seat via bolts. Both the transverse slide rail and the transverse fixing seat are mounted on the rotating base. The transverse slide rail, the first lens holder, the second lens holder, and the transverse fixing seat of this invention together constitute a precision adjustment and fixing framework for the optical waveguide structure.

[0007] Preferably, the longitudinal sliding module includes a longitudinal slide rail, a longitudinal slider, and a longitudinal fixing base. The beam guiding structure is slidably connected to one end of the longitudinal slide rail via a longitudinal slider, and the beam reflecting structure is slidably connected to the other end of the longitudinal slide rail via another longitudinal slider. Both longitudinal sliders are connected to the longitudinal fixing base by bolts, and both the longitudinal slide rail and the longitudinal fixing base are mounted on the base. The longitudinal slide rail, longitudinal slider, and longitudinal fixing base of this invention enable precise, stable, and continuous adjustment of the optical path.

[0008] Preferably, the beam guiding structure includes a third lens holder and a third plane mirror. The third plane mirror is mounted on the longitudinal sliding module via the third lens holder, and both the incident beam and the reference beam pass through the third plane mirror. The function of the third lens holder and the third plane mirror in this beam guiding structure is to change the direction of the beam emitted from the optical waveguide structure and guide it to the beam reflecting structure.

[0009] Preferably, the beam reflecting structure includes a longitudinal position adjusting seat, a fourth lens fixing seat, and a beam reflecting mirror. The beam reflecting mirror is connected to the longitudinal position adjusting seat via the fourth lens fixing seat. The longitudinal position adjusting seat is mounted on the longitudinal sliding module. The beam reflecting structure is used to convert the incident beam into a reference beam. The longitudinal position adjusting seat, fourth lens fixing seat, and beam reflecting mirror of this invention can reflect the incident beam back along its original path to form a reference beam.

[0010] Preferably, the light source collimation structure includes a lateral position adjustment seat and an optical fiber collimation module. The optical fiber collimation module is mounted on the base via the lateral position adjustment seat, and the incident light beam passes through the optical fiber collimation module. The lateral position adjustment seat and optical fiber collimation module of this invention can convert a diverging light beam emitted from the optical fiber end into a collimated light beam.

[0011] Preferably, the light source provides a structure including an optical fiber mount and an optical fiber end. The optical fiber end is mounted on the base via the optical fiber mount, and the optical fiber end is used to emit an incident light beam. This invention serves as the starting point of the entire reference arm optical path, responsible for accessing the broadband light source optical signal of the OCT system.

[0012] This utility model has the following advantages and beneficial effects compared to the prior art: This invention, through a light source providing structure, a light source collimation structure, an optical waveguide structure, a beam guiding structure, a beam reflecting structure, and a base, successfully achieves ultra-wide-range, continuous, and precise adjustment of the reference arm optical path within a small volume. It not only solves the contradiction between the adjustment range and the device volume in the prior art, but also has comprehensive advantages such as ingenious structure, low cost, high reliability, and easy operation, greatly enhancing the practicality and competitiveness of OCT technology in high-end industrial inspection and other fields. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of an optical path adjustment device for a reference arm in an OCT system according to the present invention; Figure 2 This is a schematic diagram of an optical path adjustment device for a reference arm in an OCT system according to the present invention; Figure 3This is a schematic diagram of a light source providing structure for a reference arm optical path adjustment device in an OCT system according to the present invention; Figure 4 This is a schematic diagram of a light source collimation structure for an optical path adjustment device of an OCT system reference arm according to the present invention; Figure 5 This is a schematic diagram of an optical waveguide structure for an optical path adjustment device of an OCT system reference arm according to the present invention; Figure 6 This is an assembly schematic diagram of a longitudinal sliding module, beam guiding structure, and beam reflecting structure for an optical path adjustment device of an OCT system reference arm according to this utility model; Figure 7 This is a schematic diagram of the working of an optical waveguide structure for an optical path adjustment device of an OCT system reference arm according to this utility model; The components in the attached diagram are labeled as follows: 1-Light source providing structure; 101-Fiber optic mounting base; 102-Fiber optic end; 2-Light source collimation structure; 201-Horizontal position adjustment base; 202-Fiber optic collimation module; 3-Optical waveguide structure; 301-Rotating stage; 302-Rotating base; 303-Horizontal slide rail; 304-Horizontal slider; 305-First lens mounting base; 306-Second lens mounting base; 307-First plane mirror; 308-Second plane mirror; 309-Horizontal mounting base; 4-Longitudinal sliding module; 401-Longitudinal slide rail; 402-Longitudinal slider; 403-Longitudinal mounting base; 5-Beam guiding structure; 501-Third lens mounting base; 502-Third plane mirror; 6-Beam reflecting structure; 601-Longitudinal position adjustment base; 602-Fourth lens mounting base; 603-Beam reflecting mirror; 7-Base; 8-Incident beam; a-First direction; b-Second direction. Detailed Implementation

[0014] The utility model objective of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the implementation of this utility model is not limited to the following embodiments.

[0015] In this embodiment, in the first direction a, the arrow points to the left and the opposite direction points to the right; in the second direction b, the arrow points to the rear and the opposite direction points to the front.

[0016] like Figures 1-6As shown, an optical path adjustment device for a reference arm in an OCT system includes a light source providing structure 1, a light source collimating structure 2, an optical waveguide structure 3, a longitudinal sliding module 4, a beam guiding structure 5, a beam reflecting structure 6, and a base 7. The light source providing structure 1 includes an optical fiber holder 101 and an optical fiber end 102. The light source collimating structure 2 includes a lateral position adjusting seat 201 and an optical fiber collimating module 202. The optical waveguide structure 3 includes a rotating stage 301, a rotating base 302, a lateral slide rail 303, two lateral sliders 304, a first lens holder 305, a second lens holder 306, a first plane mirror 307, a second plane mirror 308, and a lateral holder 309. The longitudinal sliding module 4 includes a longitudinal slide rail 401, two longitudinal sliders 402, and a longitudinal holder 403. The beam guiding structure 5 includes a third lens holder 501 and a third plane mirror 502; the beam reflecting structure 6 includes a longitudinal position adjustment seat 601, a fourth lens holder 602, and a beam reflecting mirror 603. The fiber optic end 102 is mounted on the right end of the base 7 via the fiber optic holder 101. The fiber optic collimation module 202 is mounted on the transverse position adjustment seat 201, which is located on the left side of the fiber optic holder 101. The right end of the fiber optic collimation module 202 corresponds to the fiber optic end 102. The bottom of the rotating stage 301 is mounted in the middle of the base 7, and the top of the rotating stage 301 is connected to the rotating base 302. The transverse slide rail 303 and the transverse fixing seat 309 are both mounted on the top of the rotating base 302. The first lens holder 305 is slidably connected to the transverse slide rail 303 via a transverse slider 304 and is located at the left end of the transverse slide rail 303. The second lens holder 306 is slidably connected to the transverse slide rail 303 via another transverse slider 304 and is located at the right end of the transverse slide rail 303. The transverse holder 309 is parallel to the transverse slide rail 303, and both transverse sliders 304 can be fixed to the transverse holder 309 by bolts. The first plane mirror 307 is mounted on the first lens holder 305, and the second plane mirror 308 is mounted on the second lens holder 306. The first plane mirror 307 and the second plane mirror 308 are arranged facing each other, parallel to each other, and staggered front to back. The first plane mirror 307 corresponds to the left end of the fiber optic collimation module 202. The longitudinal slide rail 401 is mounted on the base 7 and is located to the left of the rotary table 301. The axis of the longitudinal slide rail 401 is perpendicular to the axis of the base 7. The longitudinal holder 403 is also mounted on the base 7 and is located to the left of the longitudinal slide rail 401. The two are parallel to each other. Two longitudinal sliders 402 are slidably connected to the longitudinal slide rail 401, and both longitudinal sliders 402 can be connected to the longitudinal fixing seat 403 by bolts. The third plane mirror 502 is mounted on the longitudinal slider 402 at the rear end of the longitudinal slide rail 401 through the third lens fixing seat 501.The beam reflector 603 is mounted on the fourth lens holder 602, and the fourth lens holder 602 is mounted on the longitudinal position adjustment seat 601.

[0017] The light source providing structure 1 serves as the starting point of the entire reference arm optical path, responsible for receiving the broadband light source optical signal from the OCT system. The fiber optic mounting bracket 101 mechanically fixes and precisely positions the fiber optic end 102, ensuring the spatial stability of the fiber optic end 102 port and preventing a decrease in optical path coupling efficiency due to vibration or temperature changes; this is fundamental to optical path stability. The fiber optic end 102 primarily functions as the physical interface for transmitting the incoming light beam; the light source optical signal exits through this interface and enters the subsequent optical system. The main function of the light source collimating structure 2 is to convert the diverging beam exiting the fiber optic end into a collimated beam (i.e., parallel light), because only collimated light can maintain the spot size and wavefront shape during subsequent long-path reflections, ensuring the quality of the final interference signal. The lateral position adjustment bracket 201, available on the market, primarily fine-tunes the exit direction of the collimated beam, ensuring that the beam is precisely incident on the predetermined position on the first plane mirror at a designed angle. The fiber optic collimation module 202 typically consists of a collimating lens (such as a GRIN lens or a spherical lens) and a lens barrel. Its core optical function is to collimate the optical beam. The main function of the optical waveguide structure 3 is to provide a rotatable platform with adjustable mirror spacing, allowing the collimated beam to undergo multiple reflections between two parallel mirrors (forming a zigzag optical path). By changing the number of reflections and the geometric path of each reflection, the optical path can be significantly altered. The rotary table 301, readily available on the market, allows for precise adjustment of the angle θ between the rotating base 302 and the incident beam by rotating its knob. The angle θ of the incident beam directly determines the number of reflections N and the total optical path OPTH, forming the core mechanism for achieving a wide range of continuous optical path adjustment. The main function of the rotating base 302 is to mount and fix the transverse slide rail 303 and the transverse fixed seat 309, ensuring smooth rotation and axial stability. The main function of the transverse slide rail 303 is to provide a mounting reference for the first plane mirror 307 and the second plane mirror 308, and to allow them to slide laterally along the transverse slide rail 303, thereby adjusting the distance H between the two mirrors (i.e., the first plane mirror 307 and the second plane mirror 308). The distance H is another key variable in the optical path calculation formula. The main function of the transverse slider 304 is to connect the components of the first lens holder 305 or the second lens holder 306 to the transverse slide rail 303, achieving smooth linear movement. The main function of the first lens holder 305 is to precisely install and fix the first plane mirror 307, ensuring that the mirror surface is correctly oriented and its attitude is adjustable. The main function of the second lens holder 306 is to precisely install and fix the second plane mirror 308, ensuring that the mirror surface is correctly oriented and its attitude is adjustable. The main function of the first plane mirror 307 is to receive the incident light beam from the light source collimating structure 2, and it is the starting point for multiple reflections within the optical waveguide. The main function of the second plane mirror 308 is to be parallel to and face the first plane mirror 307, with the incident light beam reflecting back and forth between them. Finally, the incident beam and the reference beam exit from this mirror and proceed to the beam guiding structure 5.The main function of the transverse fixing seat 309 is to lock the transverse slider 304 onto this seat with bolts after the distance H between the first plane mirror 307 and the second plane mirror 308 has been adjusted, preventing changes in the distance during operation and ensuring the stability of the optical path. The main function of the longitudinal sliding module 4 is to provide precise displacement adjustment in the optical path propagation direction (i.e., longitudinal direction), to support the beam guiding structure 5 and the beam reflecting structure 6, to achieve fine-tuning of the total optical path, and to compensate for changes in the optical path exit position caused by the rotation of the optical waveguide structure 3. The main function of the longitudinal slide rail 401 is to serve as a precise guiding reference for longitudinal movement. The main function of the longitudinal slider 402 is to cooperate with the longitudinal slide rail 401 to install the beam guiding structure 5 and the beam reflecting structure 6. The main function of the longitudinal fixing seat 403 is to lock the longitudinal slider 402 and fix the position after fine-tuning. The main function of the beam guiding structure 5 is to change the direction of the beam emitted from the optical waveguide structure 3 and guide it to the beam reflecting structure 6. Its longitudinal position is adjustable and is part of the optical path fine-tuning. The main function of the third lens holder 501 is to install and adjust the angle and position of the third plane mirror 502. The third plane mirror 502, typically a fixed-angle plane mirror, deflects the horizontal beam from the second plane mirror 308 by 90°, directing it perpendicularly towards the beam reflecting structure 6. It also deflects the reference beam by 90° and guides it back to the waveguide junction 3. The main function of the beam reflecting structure 6 is to act as the end of the reference arm, reflecting the incident beam back along its original path to form a reference beam. Its longitudinal position is the final step in adjusting the optical path. The longitudinal position adjustment seat 601, available on the market, is used to finely adjust the longitudinal position of the beam reflector 603, changing the beam endpoint position to achieve fine-tuning of the optical path length. The main function of the fourth lens holder 602 is to install and fix the beam reflector 603. The beam reflector 603 is typically a plane mirror or a right-angle prism, and its function is to accurately reflect the incident beam back along its original path. The primary function of base 7 is to serve as the foundation platform for the entire device, supporting and integrating all the aforementioned optical and mechanical components. Its rigidity and stability are crucial, directly determining the relative positional accuracy between the components, thus affecting the long-term stability and repeatability of the entire optical path.

[0018] A method of using an optical path adjustment device for a reference arm in an OCT system includes the following steps: S1. Substitute both D and H into formula (1) to determine the angle between the incident beam and the rotating base 302 of the optical waveguide structure 3. Formula (1) is: ,in, The angle between the incident beam and the rotating base 302. The numerical range is 5.71°~43°; D is the diameter of the incident beam, and H is the distance between the first plane mirror 307 and the second plane mirror 308; S2, according to step S1 Rotate the angle of the rotating stage 301 of the optical waveguide structure 3 to adjust the angle between the rotating base 302 and the incident beam; S3, combine L, H from step S1 and Substituting both formulas (2) and (3), the number of reflections N is calculated. Formula (2) is... Formula (3) is Where L is the length of the first plane mirror 307, and N ranges from 4 to 29. S4, take step S1 Substituting H and N from step S3 into formula (4), the optical path length OPTH is calculated. Formula (4) is: , Where N is the number of reflections; the value range of OPTH is 202mm~1457mm.

[0019] generally The smaller the value, the larger the number of reflections N will be, but... There is a minimum degree limit; otherwise, beam aliasing will lead to energy loss.

[0020] For example: Assuming the volume of the regulating device remains constant, H=50mm, L=70mm, D=10mm, then ≥5.71°, take ≈5.71°, N=29, OPTH=1.457m; Pick ≈10.55°, N=16, OPTH=813.8mm; Pick ≈43°, N=4, OPTH=202mm The above examples already meet the actual optical path adjustment range requirements. If a larger adjustment range is needed, in addition to adjusting the distance H between the first plane mirror 307 and the second plane mirror 308, and the length L of the first plane mirror 307 and the second plane mirror 308, the beam diameter can also be reduced to widen the beam. Adjustment range.

[0021] like Figure 7 As shown, the working process of an optical path adjustment device for a reference arm in an OCT system is described: Based on the angle between the incident beam and the rotating base 302... Adjust the rotation angle of the rotary table 301. Based on the distance H between the first plane mirror 307 and the second plane mirror 308, adjust the relative positions of the first plane mirror 307 and the second plane mirror 308 on the transverse slide rail 303, and lock the two transverse sliders 304 to the transverse fixing seat 309 with bolts. Based on the position of the second plane mirror 308, adjust the position of the third plane mirror 502 on the longitudinal slide rail 401. Adjust the beam reflector 603 to its initial position on the longitudinal slide rail 401 according to the required optical path length. Fix the longitudinal slider 402 connected to the longitudinal position adjusting seat 601 to the longitudinal fixing seat 403 with bolts. Then, fine-tune the longitudinal position of the beam reflector 603 by rotating the knob of the longitudinal position adjusting seat 601. The incident light beam at fiber end 102 passes through fiber collimation module 202 and enters the first plane mirror 307. The incident light beam is reflected back and forth between the first plane mirror 307 and the second plane mirror 308, and finally enters the third plane mirror 502 from the second plane mirror 308. The third plane mirror 502 can change the angle of the incident light beam, allowing it to fall into the beam reflector 603. The optical path can also be adjusted by the position of the beam reflector 603 on the longitudinal slide rail 401. The beam reflector 603 converts the incident light beam into a reference beam. The reference beam passes through the third plane mirror 502 and enters the second plane mirror 308. The reference beam is reflected back and forth between the first plane mirror 307 and the second plane mirror 308, and finally enters the fiber collimation module 202 at the rear end of the first plane mirror 307. The reference beam then enters the fiber end 102 through the fiber collimation module 202.

[0022] The advantages of the optical path adjustment device for the reference arm of the OCT system in this embodiment are as follows: 1. Traditional solutions increase the optical path length by directly increasing the length of the slide rail or the number of reflectors, which leads to a linear or even exponential increase in the device size. The device in this embodiment cleverly utilizes angle control to replace some linear displacement, changing the number of reflections and the path of the beam by rotating the optical waveguide structure. This achieves a significant increase in optical path length within an extremely compact mechanical structure. Specifically, adjusting the angle between the rotating base 302 and the incident beam, and the distance H between the first emitting mirror 307 and the second plane mirror 308, allows for a substantial change in optical path length within a fixed physical size, achieving the design goal of "small size, high energy." The optical path length (OPTH) ranges from 202mm to 1457mm, with an adjustment range exceeding 1.2 meters. This is crucial for applications requiring long sample arms (such as OCT systems integrated with laser heads in laser processing monitoring).

[0023] 2. This device has multi-dimensional adjustment methods, offering not only a wide range but also high precision and flexibility. Specifically, the included angle is changed via the rotary table 301. This is the main means of achieving significant changes in optical path length. Fine-tuning of the optical path length is achieved by using the longitudinal sliding module 4 to precisely adjust the positions of the beam guiding structure 5 and the beam reflecting structure 6. This hierarchical adjustment method ensures both rapid matching of the approximate optical path length and precise optimization of the interference signal quality. The device in this embodiment features continuous adjustment of both angle and linear displacement, allowing the reference arm optical path length to be seamlessly and smoothly matched to the sample arm optical path length, which is beneficial for finding the optimal interference conditions.

[0024] 3. The device in this embodiment, through innovative design, utilizes conventional components to construct a high-performance system, exhibiting excellent implementability and economy. Specifically, it folds a complex spatial optical path into a compact module, demonstrating ingenious optical path design. The multiple reflection paths of the light beam between parallel mirrors are stable and controllable. The core optical components are all common plane mirrors, and mechanical parts such as slide rails and rotary tables are also standard parts or easily manufactured components, eliminating the need for special or expensive custom components and effectively controlling manufacturing costs. Its simple structure and mature mechanical guiding and locking mechanisms (such as sliders and fixed seats) for moving parts ensure stability and repeatability after adjustment, reducing the risk of optical path misalignment due to vibration or drift.

[0025] 4. This enables OCT technology to be more effectively applied to fields requiring long working distances or integration with complex optical paths, such as laser welding and online monitoring of industrial processes, solving the technical bottleneck caused by the dramatic increase in the optical path length of the sample arm in these applications. The device in this embodiment provides a clear mathematical model and adjustment steps, quantifying complex optical adjustments into calculable parameters. This allows operators to make precise settings based on established criteria, reducing the technical threshold and excessive reliance on operator experience.

[0026] The above-described specific embodiments are preferred embodiments of this utility model and are not intended to limit this utility model. Any other changes or equivalent substitutions made without departing from the technical solution of this utility model are included within the protection scope of this utility model.

Claims

1. An OCT system reference arm optical path adjustment device, characterized by: The system includes a light source providing structure, a light source collimating structure, an optical waveguide structure, a longitudinal sliding module, a beam guiding structure, a beam reflecting structure, and a base. The optical waveguide structure includes a rotating stage, a first plane mirror, and a second plane mirror. Both the first and second plane mirrors are mounted on the rotating stage via a rotating base and are arranged parallel to each other. The beam guiding structure and the beam reflecting structure are slidably mounted at both ends of the longitudinal sliding module, which is mounted on the base. The incident light beam from the light source providing structure passes sequentially through the light source collimating structure, the first plane mirror, the second plane mirror, the beam guiding structure, and the beam reflecting structure. The reference beam from the beam reflecting structure passes sequentially through the beam guiding structure, the second plane mirror, the first plane mirror, the light source collimating structure, and the light source providing structure.

2. The reference arm optical path adjustment device for an OCT system according to claim 1, characterized by: The optical waveguide structure further includes a transverse slide rail, a first lens holder, a second lens holder, and a transverse fixing seat. The first plane mirror is mounted on the first lens holder, and the second plane mirror is mounted on the second lens holder. The first lens holder is slidably connected to one end of the transverse slide rail via a transverse slider, and the second lens holder is slidably connected to the other end of the transverse slide rail via a transverse slider. The transverse slider is connected to the transverse fixing seat via bolts. Both the transverse slide rail and the transverse fixing seat are mounted on the rotating base.

3. The reference arm optical path adjustment device for an OCT system according to claim 1, characterized in that: The longitudinal sliding module includes a longitudinal slide rail, a longitudinal slider, and a longitudinal fixing base. The beam guiding structure is slidably connected to one end of the longitudinal slide rail via a longitudinal slider, and the beam reflecting structure is slidably connected to the other end of the longitudinal slide rail via another longitudinal slider. Both longitudinal sliders are connected to the longitudinal fixing base by bolts. The longitudinal slide rail and the longitudinal fixing base are both mounted on the base.

4. The optical path adjustment device for a reference arm in an OCT system according to claim 1, characterized in that: The beam guiding structure includes a third lens holder and a third plane mirror. The third plane mirror is mounted on the longitudinal sliding module via the third lens holder, and both the incident beam and the reference beam pass through the third plane mirror.

5. The optical path adjustment device for a reference arm in an OCT system according to claim 1, characterized in that: The beam reflecting structure includes a longitudinal position adjustment seat, a fourth lens fixing seat, and a beam reflecting mirror. The beam reflecting mirror is connected to the longitudinal position adjustment seat through the fourth lens fixing seat. The longitudinal position adjustment seat is installed on the longitudinal sliding module. The beam reflecting structure is used to convert the incident beam into a reference beam.

6. The optical path adjustment device for a reference arm in an OCT system according to claim 1, characterized in that: The light source collimation structure includes a lateral position adjustment seat and an optical fiber collimation module. The optical fiber collimation module is mounted on the base via the lateral position adjustment seat, and the incident light beam passes through the optical fiber collimation module.

7. The optical path adjustment device for a reference arm in an OCT system according to claim 1, characterized in that: The light source provides a structure including an optical fiber mount and an optical fiber end. The optical fiber end is mounted on the base via the optical fiber mount and is used to emit an incident light beam.

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