High-power optical fiber laser amplifier system with high mode instable threshold value

Abstract

The invention relates to a high-power optical fiber laser amplifier system with a high mode instable threshold value. The high-power optical fiber laser amplifier system comprises a linear polarization main oscillator, a collimating lens group, a lambda / 4 slide, a lambda / 2 slide, a focusing lens group, a high-power main amplifier, a beam-expanding and collimating system, a high reflective mirror,a power receiver, a beam splitter, a photoelectric signal conversion and display module and an optical beam quality measuring instrument. A polarization regulation and control system is introduced into a high-power optical fiber laser amplifier, so that the high-order mode proportion of injection and transmission along the gain fiber longitudinal direction of the high-power optical fiber laser amplifier can be reduced, and the mode unstable effect of the high-power optical fiber laser amplifier can be inhibited. The system can effectively improve the mode unstable threshold value caused by non-linear effect and the traditional transverse mode interference, and provides reliable technical means for further power improvement and performance optimization of the high-power optical fiber laser.

Description

technical field [0001] The invention belongs to the technical field of strong lasers, in particular to a high-power fiber laser amplifier system with a high mode instability threshold. Background technique [0002] Compared with other types of lasers, fiber laser has many advantages such as high conversion efficiency, good beam quality, convenient thermal management, compact structure, and easy maintenance, and has attracted extensive attention from many research institutions at home and abroad. Since the first fiber laser came out in 1964, fiber laser has made remarkable development achievements in the past 50 years of development, and its application scope has also been expanded to laser cutting, laser welding, material forming, laser Drilling, laser rock breaking and many other fields. Driven by many application fields, fiber laser, as an important technical solution to realize high-power light source, has been widely favored by researchers at home and abroad. Since the...

AI Technical Summary

Problems solved by technology

Due to the mode instability effect, the output mode of the fiber laser will be severely degraded, which will lead to a sharp degradation of the output brightness and beam quality of the fiber amplifier, and eventually lead to the overall performance degradation of the fiber laser

[0005] So far, although researchers at home and abroad have proposed various suppression methods such as bending loss, special fiber design, and changing the wavelength of signal light / pump light, the mode instability effect is still the most important way to improve the power and brightness of high-power fiber laser amplifiers. important technical bottleneck

In addition, the latest research results show that nonlinear effects such as stimulated Raman scattering can lead to a significantly lower mode instability threshold

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