Device and method for realizing welding of array optical fiber and large-size quartz end cap

Abstract

The invention discloses a device for realizing welding of an array optical fiber and a large-size quartz end cap. The device comprises a carbon dioxide laser, a spectroscope, a beam shaper, a high-reflectivity mirror, an image detection module, the array optical fiber and a carrier thereof, the large-size quartz end cap and a carrier thereof, a stepping motor, a thermodetector and a computer, a laser beam emitted by a carbon dioxide laser is divided into two beams of light through a spectroscope, the two beams of light are shaped into two beams of strip-shaped light spots with uniform power density to heat a welding surface of the large-size quartz end cap after respectively passing through a beam shaper and a high-reflectivity mirror, and a uniform temperature field of a target welding area is realized through indirect heating and heat conduction; and when the temperature of the welding area reaches the preset temperature, the stepping motor is driven to make the array optical fiber translate to the welding area at a constant speed to be fused and overlapped with the end cap, and one-time welding of the array optical fiber can be achieved. The array optical fiber end cap formed by welding the array optical fiber and the large-size quartz end cap is favorable for optimizing the light beam quality of synthesized light of a spectrum synthesis system and realizing compactness and light weight of a beam combining device.

Description

technical field [0001] The invention belongs to the field of fusion splicing of optical fiber end caps, and in particular relates to a fusion splicing device and method for an array optical fiber and a large-size quartz end cap. Background technique [0002] High-brightness fiber lasers have broad application prospects in industrial, medical, national defense and other fields. Limited by nonlinear effects, mode instability effects, and material damage characteristics, there is a theoretical limit to the output power of a single-channel single-mode fiber laser. Multi-beam combining technology is an important technical way to achieve high-power and high-beam-quality laser output. Through a specific beam combining method, not only can the output laser power be increased, but also the output laser can be guaranteed to have excellent beam quality. Among them, the spectral synthesis technology has the advantages of good output beam quality, no requirement for the sub-beam phase, ...

AI Technical Summary

Problems solved by technology

However, in the actual synthesis system, the beam quality of the synthesized light is worse than that of a single fiber input laser, which is mainly affected by factors such as the disturbance of the laser array, the aberration of the conversion lens, the thermal distortion of the diffraction grating, and the line width of the array light source. Impact

[0003] Since the single fiber output head needs to be mechanically clamped and water-cooled in the spectral beam combining device, the distance Δx between adjacent fibers cannot be reduced without limit, and the beam combining device cannot be made compact and lightweight, which limits high-brightness fiber lasers Applications on motorized platforms

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