CN-122016248-A - Test control method and device for cladding light stripper

CN122016248ACN 122016248 ACN122016248 ACN 122016248ACN-122016248-A

Abstract

The invention discloses a test control method and device of a cladding light stripper, and relates to the technical field of fiber lasers, wherein the test control method of the cladding light stripper comprises the following steps of controlling a light source module to generate a cladding light beam, enabling the cladding light beam to sequentially pass through an object to be tested and a light splitting module to form a first light beam and a second light beam, acquiring and calculating the energy ratio of the light spot energy of a fiber core light to the light spot energy of the second light beam according to the light spot imaging information of the second light beam, acquiring and calculating the cladding light filtering efficiency of the object to be tested according to the power of the cladding light beam and the power of the first light beam and combining the energy ratio.

Inventors

ZHU YONGKANG
MAI YIFAN
Chun Qiulei
LIU JINXING
LENG ZHUOYAN
HUANG ZHONGYA
YAN DAPENG

Assignees

武汉锐科光纤激光技术股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260127

Claims (10)

1. The test control method of the cladding light stripper is characterized by comprising the following steps of: the light source module is controlled to generate a cladding light beam, so that the cladding light beam sequentially passes through the object to be detected and the light splitting module to form a first light beam and a second light beam; acquiring and calculating the energy ratio of the light spot energy of the fiber core to the light spot energy of the second light beam according to the light spot imaging information of the second light beam; and obtaining and calculating the cladding light filtering efficiency of the object to be detected according to the power of the cladding light beam and the power of the first light beam and the energy ratio.
2. The method of claim 1, wherein the step of obtaining and calculating an energy ratio of the core light spot energy to the second light beam spot energy based on the spot imaging information of the second light beam comprises the steps of: calculating the homogenization according to the light spot imaging information, and determining a relation curve of the homogenization and the radial size of the light spot; Calculating the radius of the optical spot of the fiber core according to the relation curve of the homogenization and the radial size of the light spot, and calculating the radius of the second light beam light spot according to the relation curve of the homogenization and the radial size of the light spot; and calculating the energy ratio of the energy of the fiber core light spot to the energy of the second light beam spot according to the radius of the fiber core light spot and the radius of the second light beam spot.
3. The method of testing and controlling a clad light stripper according to claim 2, wherein the calculating the radius of the core light spot according to the relationship between the uniformity and the radial dimension of the light spot and the calculating the radius of the second light beam spot according to the relationship between the uniformity and the radial dimension of the light spot comprises the steps of: Obtaining two sections of first homogenization degree line segments according to the relation curve of the homogenization degree and the radial dimension of the light spot; Calculating the radius of the optical spot of the fiber core according to the radial size of the minimum light spot between the two sections of the first uniformity line segments; And calculating the second light beam spot radius according to the maximum light spot radial size between the two sections of the first uniformity line segments.
4. The method for controlling the test of the clad light stripper according to claim 2, wherein the step of calculating the uniformity from the spot imaging information and determining the relationship between the uniformity and the radial dimension of the spot comprises the steps of: calculating homogenization according to the light spot imaging information, and determining a relation curve of the homogenization and the radial size of the light spot along a first direction and a second direction respectively; Calculating the radius of the optical spot of the fiber core according to the relation curve of the homogenization degree and the radial dimension of the optical spot, and the method comprises the following steps: and obtaining a first radius and a second radius of the fiber core light spot according to the relation curves of the two homogenization degrees and the radial dimension of the light spot, and taking the larger one of the first radius and the second radius as the radius of the fiber core light spot.
5. The method of testing and controlling a clad light stripper according to claim 4, wherein the first direction and the second direction are perpendicular to each other.
6. The test control method of the clad light stripper according to claim 2, wherein the spot imaging information includes intensity of a spot; the calculating the energy ratio of the energy of the fiber core light spot to the energy of the second light beam spot according to the radius of the fiber core light spot and the radius of the second light beam spot comprises the following steps: and obtaining and according to the intensity of the light spot, combining the light spot radius of the fiber core and the light spot radius of the second light beam, and calculating to obtain the energy ratio of the light spot energy of the fiber core to the light spot energy of the second light beam.
7. The test control method of the clad light stripper according to claim 2, wherein the step of calculating the uniformity from the spot imaging information comprises the steps of: Obtaining the highest light intensity and the lowest light intensity of the second light beam facula on the unit pixel area; and calculating the homogenization according to the ratio of the difference value of the highest light intensity and the lowest light intensity to the highest light intensity.
8. The method for controlling the clad light stripper according to claim 1, wherein the step of obtaining and calculating the clad light filtering efficiency of the object to be measured according to the power of the clad light beam and the power of the first light beam and in combination with the energy ratio comprises the following steps: Acquiring and calculating residual cladding light power passing through an object to be detected according to the light splitting ratio of the light splitting module and the power of the first light beam; and obtaining the power of the cladding light beam, and calculating the cladding light filtering efficiency of the object to be detected according to the power of the cladding light beam, the residual cladding light power and the energy ratio.
9. The method of claim 1, wherein the power of the cladding beam generated by the light source module is set to be P0, and the power of the first beam is set to be P1, such that P1 is equal to or greater than 0.99P0.
10. A test apparatus for a clad light stripper, comprising: A light source module for generating a cladding beam; A beam splitting module for splitting the residual cladding beam passing through the object to be measured into a first beam and a second beam; The power testing module is used for testing the power of the first light beam; An imaging module for acquiring spot imaging information of the second light beam, and The controller is used for electrically connecting the light source module, the power test module and the imaging module; Wherein the controller comprises a memory, a processor and a test control program of the clad light stripper stored on the memory and operable on the processor, the test control program of the clad light stripper, when executed by the processor, implementing the steps of the test control method of the clad light stripper according to any one of claims 1 to 9.

Description

Test control method and device for cladding light stripper Technical Field The invention relates to the technical field of fiber lasers, in particular to a test control method and device of a cladding light stripper. Background In laser designs, such as double-clad fiber lasers, the cladding region of the fiber accumulates a significant amount of light due to certain unavoidable factors. If these rays are not processed and output directly with the laser, they not only degrade the quality of the output beam, but can also cause overheating of the fiber and even damage to the fiber assembly. Thus, a Cladding Light Stripper (CLS) plays a vital role in a fiber laser, which optimizes the beam quality by removing light in the cladding, ensuring stable operation of the laser. The working mechanism is to break the total reflection condition of the light in the optical fiber cladding, so that the light in the cladding is separated. Therefore, it is important how reliably the amount of cladding light removed from the system is evaluated. Since a portion of the cladding light having a lower numerical aperture is coupled into the core region of the cladding light stripper, this portion of the light is often misinterpreted as core light when using a conventional test method, resulting in a decrease in test accuracy. Disclosure of Invention The invention mainly aims to provide a test control method and device for a cladding light stripper, and aims to improve the test precision of the cladding light stripper. In order to achieve the above purpose, the test control method of the cladding light stripper provided by the invention comprises the following steps: the light source module is controlled to generate a cladding light beam, so that the cladding light beam sequentially passes through the object to be detected and the light splitting module to form a first light beam and a second light beam; acquiring and calculating the energy ratio of the light spot energy of the fiber core to the light spot energy of the second light beam according to the light spot imaging information of the second light beam; And obtaining and calculating the cladding light filtering efficiency of the object to be detected according to the power of the cladding light beam and the power of the first light beam and the energy ratio. In an embodiment, the obtaining and calculating the energy ratio of the core light spot energy to the second light beam spot energy according to the spot imaging information of the second light beam includes the following steps: calculating the homogenization according to the light spot imaging information, and determining a relation curve of the homogenization and the radial size of the light spot; Calculating the radius of the optical spot of the fiber core according to the relation curve of the homogenization and the radial size of the light spot, and calculating the radius of the second light beam light spot according to the relation curve of the homogenization and the radial size of the light spot; and calculating the energy ratio of the energy of the fiber core light spot to the energy of the second light beam spot according to the radius of the fiber core light spot and the radius of the second light beam spot. In an embodiment, the calculating the radius of the optical spot of the fiber core according to the relationship between the uniformity and the radial dimension of the spot, and the calculating the radius of the second beam spot according to the relationship between the uniformity and the radial dimension of the spot, includes the following steps: Obtaining two sections of first homogenization degree line segments according to the relation curve of the homogenization degree and the radial dimension of the light spot; Calculating the radius of the optical spot of the fiber core according to the radial size of the minimum light spot between the two sections of the first uniformity line segments; And calculating the second light beam spot radius according to the maximum light spot radial size between the two sections of the first uniformity line segments. In one embodiment, the calculating the uniformity according to the spot imaging information, determining the relationship curve between the uniformity and the radial dimension of the spot, includes the following steps: calculating homogenization according to the light spot imaging information, and determining a relation curve of the homogenization and the radial size of the light spot along a first direction and a second direction respectively; Calculating the radius of the optical spot of the fiber core according to the relation curve of the homogenization degree and the radial dimension of the optical spot, and the method comprises the following steps: and obtaining a first radius and a second radius of the fiber core light spot according to the relation curves of the two homogenization degrees and the radial dimension of the light spot, and taking the larg