High-power narrow-linewidth fiber laser based on ring cavity oscillator seed source

Abstract

The invention provides a high-power narrow-linewidth optical fiber laser based on an annular cavity oscillator seed source. The high-power narrow-linewidth optical fiber laser comprises the annular cavity oscillator seed source, a main laser amplifier and a main output end, and the annular cavity oscillator seed source, the main laser amplifier and the main output end are connected in sequence; and the annular cavity oscillator seed source comprises a filter device, a laser output module and a pre-laser amplifier, the filter device, the laser output module and the pre-laser amplifier are sequentially connected to form an annular structure, and the annular cavity oscillator seed source is connected with the main laser amplifier through one output end of the laser output module. The laser provided by the invention only needs one-stage amplification, is simple in structure and reliable in performance, can reduce the complexity of a high-power narrow-linewidth fiber laser system, enables the power to be further amplified without being inhibited by a nonlinear effect, is more stable in output laser time sequence, and can improve the inhibition capability of stimulated Raman scattering in the power amplification process.

Description

technical field [0001] The invention belongs to the field of fiber laser equipment, in particular to a high-power narrow-linewidth fiber laser based on a seed source of a ring cavity oscillator. Background technique [0002] High-power narrow-linewidth fiber laser is an important unit for spectral synthesis and coherent synthesis. The popular high-power narrow-linewidth fiber lasers can be divided into three types according to the type of seed source, namely, single-frequency phase-modulated laser, narrow-linewidth oscillator, and superfluorescent or random laser filter seed source. [0003] Single-frequency phase-modulated lasers need to suppress the stimulated Brillouin scattering effect in the power amplification process because the single-frequency laser linewidth is too narrow, and require an expensive and accurate phase modulation system to apply white noise or sinusoidal signal phase modulation to make its spectrum Broadening; due to the low output power of single-fr...

AI Technical Summary

Problems solved by technology

However, the nonlinear effect of self-phase modulation, cross-phase modulation and four-wave mixing caused by multiple longitudinal modes in the oscillator and the spatial hole-burning effect caused by the standing wave field structure will bring about spectral broadening, which limits the linewidth at high power. control makes it difficult

In addition, the relaxation-like oscillation pulse and self-mode-locked pulse in the oscillator will cause the output laser timing to be unstable, and stimulated Raman scattering will appear during the amplification process, which inhibits the further increase of power

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