A narrow linewidth fiber laser with wide range and high precision linewidth adjustable

Abstract

The invention discloses a narrow-linewidth fiber laser with wide range and high-precision linewidth adjustable, including two laser emitting devices, a multiplexer, a polarization controller and a nonlinear optical fiber; the tunable single-frequency laser seed source generates a single-frequency For fiber laser, the fiber amplifier amplifies the power of the single-frequency fiber laser, and the combiner combines the power-amplified two beams of single-frequency fiber laser into one beam of laser light, and the polarization controller adjusts the polarization state of the combined laser beams. Linear fibers are used to control the linewidth of the output laser. By adjusting the power ratio of the two laser beams injected into the nonlinear fiber, the gain in the nonlinear fiber can be changed, and the output laser line width can be further controlled. The narrow line width fiber laser finally realized has flexible and controllable line width. , large adjustment range, high linewidth adjustment accuracy and other advantages, the narrow linewidth fiber laser provided by the present invention can be applied to optical wavelength division multiplexing systems, coherent synthesis, spectral synthesis, gravitational wave detection and other aspects.

Description

technical field [0001] The invention relates to the technical field of fiber lasers, in particular to a narrow linewidth fiber laser with a large linewidth adjustment range and high adjustment precision. Background technique [0002] High-power narrow-linewidth fiber lasers have unique advantages in terms of power level and linewidth characteristics, and have become a hot spot for research and application at home and abroad. Especially in applications such as lidar, coherent synthesis, spectral synthesis, gravitational wave detection, and nonlinear frequency conversion, narrow-linewidth fiber lasers are required to have characteristics such as high power or energy, specific operating wavelength, and linear polarization output. In order to solve the above problems, the main oscillation power amplification (MOPA) technology scheme of seed source is adopted, based on the low-power narrow-linewidth laser as the seed source, and the rare earth ion-doped fiber amplifier is used fo...

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Problems solved by technology

However, the patent (application) has low output laser coherence or uncontrollable line width

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