Pulse fiber laser employing semiconductor laser seed source

Abstract

The invention is suitable for the technical field of laser, and provides a pulse fiber laser. The pulse fiber laser comprises a pulse laser transmitter, a front laser amplifier, a spectrum broadening line and a post laser amplifier, which are sequentially connected with one another; the front laser amplifier is used for amplifying an optical pulse output by the pulse laser transmitter; the amplified optical pulse generates the nonlinear effect comprising stimulated brillouin scattering and raman scattering at least in the spectrum broadening line, so that the spectrum of the optical pulse is broadened; frequency shift of the wavelength of the optical pulse towards the long wavelength direction is achieved; and the post laser amplifier is used for amplifying the optical pulse after spectrum broadening is achieved, so as to obtain a narrow pulse. The spectrum broadening line is arranged between the front laser amplifier and the post laser amplifier, so that spectrum broadening is achieved; the giant pulse and frequency hole burning are avoided; the amplified pulse is narrowed to form a narrow pulse with high peak power and high single-pulse energy; the cost can be reduced; the demands on the pulse laser transmitter can be reduced; and the reliability is improved.

Description

technical field [0001] The invention belongs to the technical field of lasers, in particular to a pulse fiber laser of a semiconductor laser seed source. Background technique [0002] Fiber lasers are widely used in industrial fields such as industrial welding, cutting, marking, and engraving, as well as medical, free-space transmission, military, and sensing. Especially in recent years, pulsed fiber lasers have been widely used and promoted. Pulsed fiber lasers with MOPA (Master Oscillator Power Amplification) structure are currently one of the mainstream products on the market. This kind of laser generally uses semiconductor lasers as laser seed sources, but due to the narrow linewidth of semiconductor lasers (usually several nanometers ), it is very easy to generate nonlinear effects such as stimulated Brillouin scattering (SBS) and stimulated Raman (SRS) in the latter amplifier, and the laser threshold for generating SBS is low, resulting in low laser power in the fiber...

AI Technical Summary

Problems solved by technology

MOPA pulsed lasers, which are common semiconductor laser seed sources on the market, generally solve the above problems by increasing the minimum repetition rate or reducing the average output power, but at the cost of reducing the average output power, it is still not an ideal solution.

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