Adaptive optical fiber coupling and output collimation device for variable light beam quality laser

Abstract

The invention provides an adaptive optical fiber coupling and output collimation device for a variable light beam quality laser. The adaptive optical fiber coupling and output collimation device mainly comprises a beam expander 1, a focusing lens 2, an optical fiber transmission system 3, a collimating lens 4, a detection unit 5, a processing unit 6, a controller 7, a one-dimensional micro-motion platform 8, an optical adjustment frame 9 and the like, wherein a laser beam is subjected to beam expansion and collimation through a Galilean telescope system 1; the light beam subjected to beam expansion and collimation is coupled to the front end face of the optical fiber transmission system 3 through the focusing lens 2 and is transmitted in the optical fiber transmission system 3; an emergent light beam of the optical fiber transmission system 3 is collimated through the collimating lens 4; the collimating lens 4 reflects a small quantity of light due to incomplete transmission; the light reflected by the collimating lens 4 is received by the detection unit 5; the detection unit 5 converts received light signals into electric signals; the processing unit 6 sums the electric signals received by the detection unit 5; and the controller 7 controls the one-dimensional micro-motion platform 8 to do one-dimensional motion along an axial direction in a binary search mode according to a processing result acquired by the processing unit 6 so as to drive the optical adjustment frame 9 and the focusing lens 2 to move. The problem of coupling focusing light spot drift of the variable light beam quality laser is solved by an automatic compensation method; and by the method, damage to the optical fiber end face caused by the focusing light spot drift and reduction of coupling efficiency are effectively avoided.

Description

technical field [0001] The patent of the present invention relates to a variable beam quality laser beam adaptive fiber coupling and output collimation device. Background technique [0002] The use of optical fiber to transmit high-power laser improves the intelligence and flexibility of the laser system, and has become the mainstream of laser transmission technology. How to improve the efficiency of optical fiber coupling is one of the key issues in optical fiber transmission technology, and it is also a bottleneck problem restricting high-power laser optical fiber transmission technology. [0003] Researchers have proposed many high-power laser fiber coupling methods, such as patent 1: [02104969.6] "laser fiber coupler", which provides a random compensation transmission fiber coupler, but the lasers suitable for this device are limited, And must rely on human observation, poor security; Patent 2: [200510020098.8] "optical fiber coupling device" provides a high-accuracy, p...

AI Technical Summary

Problems solved by technology

[0005] The variable beam quality laser beam adaptive fiber coupling and output collimation device of the present invention adopts automatic compensation to solve the problem of coupling focus spot drift of the variable beam quality laser

Images