An optical fiber precision focusing coupling device and its installation method

Abstract

The invention discloses an optical fiber precision focusing coupling device, which comprises a reference platform and a 2-second autocollimator located on the upper end of the 2-second autocollimator. There is a horizontal angle fine-tuning knob on the instrument; the front end of the 2-second autocollimator is equipped with a fiber coupling group connected to the light source control box. The fiber coupling group includes the fiber The base of the mirror group, the base of the coupling mirror group is provided with a coupling lens mounting surface, the lens mounting surface is provided with a coupling lens, the front end of the coupling lens is provided with an optical fiber working end face and an optical fiber clamping group matched with the optical fiber working end face; the coupling mirror group and The optical fiber clamping group is respectively provided with a matched water-cooled refrigeration device 1 and a water-cooled refrigeration device 2. The beneficial effects of the present invention are: simple structure, easy realization of the assembly and adjustment method, and can eliminate the influence of mechanical part processing error, optical part error and assembly error on the actual focus position.

Description

technical field [0001] The invention relates to a laser coupling device, in particular to an optical fiber precision focusing coupling device and an assembly method. Background technique [0002] In the laser industry, the common problems and defects of the current fiber coupling technology are: [0003] 1. In laser fiber coupling technology, low power (several watts - tens of watts) optical fiber focusing coupling, the common technology can only perform non-quantitative visual manual focusing operation, and find the inflection point by recording the power output change, Feel the operation by experience; or use the spacer car to adjust the focus, and cannot perform high-precision fine quantitative focus. [0004] 2. The laser beams passed by the front group to be converged by the focusing lens are often multi-channel laser beams in fiber lasers, even as many as nearly 20 high-power laser beams, and the single-beam laser power is as high as 60W or higher. The total power of...

AI Technical Summary

Problems solved by technology

[0003] 1. In laser fiber coupling technology, low power (several watts - tens of watts) optical fiber focusing coupling, the common technology can only perform non-quantitative visual manual focusing operation, and find the inflection point by recording the power output change, Feel the operation by experience; or use the spacer car to adjust the focus, and cannot perform high-precision fine quantitative focus

[0004] 2. The laser beams passed by the front group to be converged by the focusing lens are often multi-channel laser beams in fiber lasers, even as many as nearly 20 high-power laser beams, and the single-beam laser power is as high as 60W or higher. The total power of the laser beam is as high as thousands of watts. After being focused on the working end face of the Φ0.4mm quartz fiber, the power density is extremely high, and the temperature near the focus is extremely high. The end face attitude of the laser can be coupled into the optical fiber for transmission, and a very small position error will cause the optical fiber to burn out; the traditional optical fiber focusing and coupling technology cannot effectively solve this technical problem, because the necessary focusing and coupling accuracy cannot be achieved. , it is easy to burn the optical fiber, damage the laser, and it is a relatively large quality accident

[0005] 3. The coupling efficiency of the traditional optical fiber focusing coupling technology is generally not high, the highest can reach 70%, and it is difficult to improve it, which is determined by the shortcomings of the traditional coupling method

[0006] 4. In actual operation, due to processing errors of mechanical parts, errors of optical parts, and assembly errors are inevitable, the actual focus position often deviates from the original theoretical design position, and the traditional optical fiber focusing coupling method cannot solve it well This problem, since the exact location of the actual focal point cannot be found, is often unsolvable

[0007] For the related problems in the prior art, no effective solution has been proposed yet

Images