CN-122018099-A - Automatic light source coupling adjusting device and method

CN122018099ACN 122018099 ACN122018099 ACN 122018099ACN-122018099-A

Abstract

The invention belongs to the technical field of light source coupling, and provides an automatic light source coupling adjusting device and method for solving the problem of low light coupling precision in the prior art, wherein the automatic light source coupling adjusting device comprises a first reflecting mirror, a focusing objective lens and a second reflecting mirror, wherein the optical center of the first reflecting mirror is arranged at one focal position of an ellipsoid, and the optical center of the focusing objective lens is arranged at the other focal position of the ellipsoid; the method comprises the steps of obtaining the initial position range of a first reflecting mirror, obtaining the initial position range of the second reflecting mirror, moving the position of the second reflecting mirror, adjusting the rotation angles of the two reflecting mirrors based on the optical fiber coupling optical power after entering an optical fiber sequentially through the first reflecting mirror, the second reflecting mirror and the adjustable focusing objective lens until the optical fiber coupling optical power is maximized, controlling the two reflecting mirrors to rotate the same angle in the same direction, adjusting the incidence direction of light beams entering the center of the optical fiber until the optical fiber coupling optical power is maximized to enable the light beams to enter the optical fiber axially, and adjusting the focal length of the adjustable focusing objective lens to enable the light beams to be aligned with the end face of the optical fiber to finish focusing.

Inventors

SONG WEIYE
Yan Bingcan
LIU ENYU
ZHOU LIBO
CUI YUAN
QI MIN
XU GUODONG
Yao Zhengkai
ZHAO YIXIANG
YI WEI
GUAN YANXIN
ZHANG SUHANG
YAO BIN
YANG HAOHUA

Assignees

山东大学

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (15)

1. The light source coupling automatic adjusting device is characterized by comprising an adjustable focusing objective lens, a first reflecting mirror, a second reflecting mirror, a power detection module, a focusing platform and a control end; The optical center of the first reflector is arranged at one focal position of the ellipsoid, and the optical center of the adjustable-focus objective lens is arranged at the other focal position of the ellipsoid; The control end is used for moving the position of the second reflecting mirror based on the initial position range of the second reflecting mirror, adjusting the rotation angles of the first reflecting mirror and the second reflecting mirror based on the optical fiber coupling optical power of the light beam fed back by the power detection module after entering the optical fiber through the first reflecting mirror, the second reflecting mirror and the adjustable objective lens in sequence, so as to change the incidence position of the light spot on the end face of the optical fiber until the optical fiber coupling optical power is maximized; Then the first reflecting mirror and the second reflecting mirror are controlled to rotate by the same angle along the same direction so as to ensure that the incident angle of the light beam entering the adjustable focusing objective lens is unchanged, the incident position of the light beam on the adjustable focusing objective lens is changed, and the incident direction of the light beam entering the center of the optical fiber is further regulated until the optical fiber coupling light power is maximized to realize the axial incidence of the light beam along the optical fiber; The focusing platform is used for adjusting the focal length of the adjustable focusing objective lens to enable the light beam to be aligned with the end face of the optical fiber to finish focusing.
2. The apparatus of claim 1, wherein the initial position range of the second mirror is determined based on the incident angle range of the light beam incident on the first mirror, specifically: Determining the incidence angle range of the light beam incident to the first reflecting mirror according to the diameter of the end face of the optical fiber and the distance from the adjustable focusing objective lens to the end face of the optical fiber; and determining the initial position range of the second reflector based on the positions of the first reflector and the adjustable-focus objective lens, and enabling the light beam to enter the optical fiber through the first reflector, the second reflector and the adjustable-focus objective lens in sequence.
3. The apparatus of claim 2, wherein the direction of incidence of the light beam to the adjustable objective lens is determined based on the position of the optical center of the second mirror on the ellipsoid and the position of the optical center of the adjustable objective lens, and wherein the initial range of positions of the second mirror is determined based on the angle between the light beam incident to the adjustable objective lens and the optical axis.
4. The automatic light source coupling adjusting device according to claim 1, wherein an initial normal vector of a plane in which the first reflecting mirror is located and an optical center position of the second reflecting mirror are set, an outgoing direction vector and an incoming direction vector are calculated based on an incoming straight line of the first reflecting mirror and an outgoing straight line reflected to the adjustable objective lens by the second reflecting mirror, a unit normal vector of the first reflecting mirror satisfying the reflection law is obtained based on a difference between the outgoing direction and the incoming direction, and a rotation angle of the first reflecting mirror is determined based on the unit normal vector of the plane in which the first reflecting mirror is located with reference to the initial normal vector of the plane in which the first reflecting mirror is located.
5. The automatic light source coupling adjusting device according to claim 1, wherein an initial normal vector of a plane of the second reflecting mirror is set, a unit normal vector of the plane of the second reflecting mirror is calculated according to a curved surface gradient based on a normal vector of the plane of the second reflecting mirror and a gradient of the ellipsoid at an optical center point of the second reflecting mirror in the same direction, and a rotation angle of the second reflecting mirror is determined according to the unit normal vector of the plane of the second reflecting mirror.
6. The automatic light source coupling adjustment device according to claim 5, wherein the rotation angle of the second reflecting mirror is determined according to a unit normal vector of a plane in which the second reflecting mirror is located, specifically: According to the component of the unit normal vector of the plane where the second reflecting mirror is located, reversely resolving to obtain rotation angles corresponding to the rotation twice around different coordinate axes; And carrying out posture adjustment on the second reflecting mirror based on the rotation angle, so that the normal vector of the plane of the second reflecting mirror is consistent with the unit normal vector.
7. The automatic light source coupling adjusting device according to claim 1, wherein an angle between an incident direction and an outgoing direction is unchanged after a light beam is reflected by the first reflecting mirror and the second reflecting mirror when the first reflecting mirror and the second reflecting mirror are rotated in the same direction and the rotation angle is the same according to a reflection law of light.
8. The apparatus of claim 1, wherein the distance of the light spot moving on the second mirror is calculated based on an optical path length between the first mirror and the second mirror, an optimal exit angle of the second mirror, an angle between a normal line of a plane of the first mirror and a normal line of a plane of the second mirror, and an angle set by deflection of the first mirror and the second mirror in the same direction, and the distance of the light spot moving on the objective lens is derived based on the distance of the light spot moving on the second mirror.
9. The apparatus of claim 8 wherein the distance of movement of the spot on the adjustable objective lens is derived using a sine theorem based on the distance of movement of the spot on the second mirror.
10. The automatic light source coupling adjusting device according to claim 1, wherein the first reflecting mirror and the second reflecting mirror are controlled according to a preset scanning track on the end face of the optical fiber, coarse scanning is performed by a first moving step length, optical fiber coupling power fed back by the power detection module is recorded at each preset scanning position, the optical fiber coupling power corresponding to each preset scanning position is compared to determine a rough adjusting position of the second reflecting mirror, the rough adjusting position of the second reflecting mirror is taken as a center, the first reflecting mirror and the second reflecting mirror are controlled to perform fine scanning on the end face of the optical fiber by a second moving step length, and when the optical fiber coupling power fed back by the power detection module reaches a maximum value, light beams are aligned to the center of the end face of the optical fiber, wherein the first moving step length is larger than the second moving step length.
11. The automatic light source coupling adjusting device according to claim 1, wherein the first mirror and the second mirror are controlled to perform coarse scanning on the focusing objective lens with a first displacement step length, optical fiber coupling power fed back by the power detection module is recorded at each drop point position, the optical fiber coupling power corresponding to each drop point position is compared, a coarse rotation angle combination of the first mirror and the second mirror is determined, the coarse rotation angle combination of the first mirror and the second mirror is used as a center, fine scanning is performed on the focusing objective lens with a second displacement step length, and light beams are incident along the optical fiber axial direction when the optical fiber coupling power fed back by the power detection module reaches a maximum value, wherein the first displacement step length is larger than the second displacement step length.
12. The automatic light source coupling regulating method is characterized in that the optical center of the first reflecting mirror is arranged at one focal position of the ellipsoid, and the optical center of the adjustable-focus objective lens is arranged at the other focal position of the ellipsoid, and the automatic light source coupling regulating method comprises the following steps: Determining an initial position range of the second reflecting mirror based on a light beam incidence angle variation range of the first reflecting mirror; Based on the initial position range of the second reflector, moving the position of the second reflector, and based on the optical fiber coupling optical power after the light beam sequentially enters the optical fiber through the first reflector, the second reflector and the adjustable objective lens, adjusting the rotation angles of the first reflector and the second reflector to change the incidence position of the light spot on the end face of the optical fiber until the optical fiber coupling optical power is maximized; Then the first reflecting mirror and the second reflecting mirror are controlled to rotate by the same angle along the same direction so as to ensure that the incident angle of the light beam entering the adjustable focusing objective lens is unchanged, the incident position of the light beam on the adjustable focusing objective lens is changed, and the incident direction of the light beam entering the center of the optical fiber is further regulated until the optical fiber coupling light power is maximized to realize the axial incidence of the light beam along the optical fiber; the focal length of the adjustable focus objective lens is adjusted, focusing is completed by aligning the light beam to the end face of the optical fiber.
13. An electronic device comprising a memory and a processor and computer instructions stored on the memory and running on the processor, which when executed by the processor, perform the method of claim 12.
14. A computer readable storage medium storing computer instructions which, when executed by a processor, perform the method of claim 12.
15. A computer program product comprising a computer program which, when executed by a processor, implements the method of claim 12.

Description

Automatic light source coupling adjusting device and method Technical Field The invention belongs to the technical field of light source coupling, and particularly relates to an automatic light source coupling adjusting device and method. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. In the fields of photonic chip packaging, optical fiber sensing systems, high-power laser processing and the like, efficient coupling of a light source and a coupling object is one of core technical bottlenecks. With the development of light source technology, the wide spectrum light source and the high power infrared light source are increasingly widely applied, and the structural accuracy requirement of the coupling object is continuously improved. Under the technical development trend, the influence of the coupling deviation on the optical coupling efficiency is remarkably amplified, and the coupling deviation covers multidimensional parameter deviations such as spatial position deviation, angle inclination deviation, phase matching deviation and the like, so that the control difficulty of the coupling precision between the light source and the coupling object is greatly improved, and higher technical requirements are also provided for the stability of the coupling process. At present, the coupling adjustment of the light source and the coupling object mostly adopts a traditional manual adjustment or a simple closed-loop control scheme. The simple closed-loop control scheme takes a single optical power signal as a feedback basis, such as a conventional optical power threshold triggering type one-way adjustment scheme, and the scheme adjusts the axial position of a coupling component through a fixed step length to realize basic coupling alignment of the light source and the coupling object. However, the conventional coupling adjustment scheme has a plurality of technical defects in practical application, and is difficult to meet the coupling requirements of an optical system with high precision, high stability and high efficiency, and the technical defects are specifically shown in the following aspects: 1. the accuracy of the coupling adjustment is low and the consistency is poor. The traditional adjustment depends on experience and operation hand feeling of operators, so that control precision of coupling parameters (such as alignment precision, angle adjustment, light spot distance and the like) is difficult to ensure, coupling effect differences of different operators or the same operator in different operation batches are large, coupling efficiency fluctuation is obvious, and strict requirements of a high-precision optical system cannot be met. 2. The operational efficiency of the coupling adjustment is low. The existing adjusting mode needs repeated manual adjustment and data monitoring (such as power meter reading), and needs continuous adjustment of a mechanical structure, so that the whole process is tedious and time-consuming, and especially in the application scene of complex multichannel coupling or micro optical devices, the single adjustment can take a plurality of hours, and the requirements of batch production or quick debugging are difficult to meet. 3. The stability and anti-interference capability of the coupling system are weak. After manual adjustment is completed, the mechanical structure fixing mode realized through manual locking is easily affected by environmental vibration and temperature change, so that the coupling position is offset, the coupling efficiency can not be monitored and dynamically compensated in real time manually, the coupling efficiency is continuously attenuated in long-term operation, and the subsequent maintenance cost is high. In summary, a technical scheme capable of realizing high-precision, high-stability and high-efficiency coupling adjustment of a light source and a coupling object is developed, and the technical scheme is a technical problem to be solved in the fields of current photonic chip packaging, optical fiber sensing systems, high-power laser processing and the like. Disclosure of Invention In order to overcome the defects in the prior art, the invention provides an automatic light source coupling adjusting device and an automatic light source coupling adjusting method. Decoupling of the light angle and the light spot falling point position is achieved, and coupling efficiency is greatly improved. In order to achieve the above purpose, the present invention adopts the following technical scheme: The invention provides an automatic light source coupling adjusting device, which comprises an adjustable focusing objective lens, a first reflecting mirror, a second reflecting mirror, a power detection module, a focusing platform and a control end, wherein the adjustable focusing objective lens is arranged on the first reflecting mirror; The optical center of