Tens-of-megahertz high-repetition-frequency nanosecond all-optical fiber laser amplifier

Abstract

The invention discloses a tens-of-megahertz high-repetition-frequency nanosecond all-optical fiber laser amplifier. The amplifier comprises a single-mode optical fiber seed source, an optical fiber stretcher, an optical fiber power amplifier and a signal light output system; the single-mode optical fiber seed source is a high-repetition-frequency picosecond pulse laser for realizing passive mode locking based on a semiconductor saturable absorber; the optical fiber stretcher is composed of a chromatic dispersion device and an optical fiber communication device used in cooperation with the chromatic dispersion device, and is used for stretching a front-stage picosecond pulse to an order of a few nanoseconds; and the optical fiber power amplifier is a main oscillation power amplifier which is formed by cascading multistage optical fiber amplifiers. Parameters of a resonant cavity are optimized, and an obtained tens-of-megahertz high-repetition-frequency mode-locking picosecond pulse is injected into the optical fiber stretcher, so that stable nanosecond high-repetition-frequency pulse output is achieved; then the pulse is subjected to multistage amplification by adopting a gain optical fiber; and finally high-repetition-frequency high-power nanosecond pulse output is realized. Moreover, the system realizes an all-optical fiber mode, and is stable in work and high in reliability.

Description

technical field [0001] The invention relates to the field of fiber lasers, in particular to a tens of megahertz high repetition frequency nanosecond all-fiber laser amplifier. Background technique [0002] Pulsed fiber lasers have the characteristics of compact structure, stable operation, convenient thermal management, high beam quality and high light-to-light conversion efficiency, etc., and are being widely developed and applied. Among them, nanosecond fiber lasers are an important branch in this field, especially tens of megahertz. Fiber lasers with repetition frequency, high average power, and nanosecond pulse width are becoming more and more valuable in the fields of laser ranging, lidar systems, and special material processing. [0003] The current signal light generation devices of nanosecond fiber lasers are usually: Q-switched solid-state lasers, Q-switched fiber lasers and pulse-modulated semiconductor lasers, which are limited by the Q-switch modulation frequency...

AI Technical Summary

Problems solved by technology

However, when the large core diameter fiber of this special structure is fused with other fibers in the system to achieve high-quality full-fiber fusion, a special fiber fusion splicer is required to optimize the fusion

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