Optical fiber precision focusing coupling device and adjustment method

Abstract

The invention discloses an optical fiber precision focusing coupling device, which comprises a reference platform and a 2-second autocollimator located at the upper end of the reference platform, and is characterized in that the front end and the rear end of the 2-second autocollimator are provided with an objective lens and an eyepiece respectively, and the 2-second autocollimator is provided with a horizontal angle micro fine tuning knob; the front end of the 2-second autocollimator is provided with an optical fiber coupling group connected to a light source control box, the optical fiber coupling group comprises an optical fiber coupling group base plate and a coupling lens group located at the upper end, the coupling lens group comprises a coupling lens group base, the coupling lens group base is provided with a coupling lens mounting surface, the lens mounting surface is provided with a coupling lens, and 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; and the coupling lens group and the optical fiber clamping group are provided with a matched water-cooling refrigeration device I and a matched water-cooling refrigeration device II respectively. The optical fiber precision focusing coupling device has the beneficial effects that the structure is simple, the adjustment method is easy to implement, and influences imposed on the actual focus position by a mechanical piece machining error, an optical piece error and an assembling error can be eliminated.

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, Operate by experience; or use a spacer car to adjust the focus, and cannot perform high-precision fine quantitative focusing. [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 converging power o...

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, Operate by experience; or use a 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 converging 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

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