Wide-range high-precision narrow-linewidth optical fiber laser with adjustable linewidth

Abstract

The invention discloses a wide-range high-precision narrow-linewidth optical fiber laser with an adjustable linewidth, which comprises two laser emitting devices, a wave combiner, a polarization controller and a nonlinear optical fiber. A tunable single-frequency laser seed source generates single-frequency optical fiber laser, an optical fiber amplifier amplifies the power of the single-frequencyoptical fiber laser, the wave combiner combines the two single-frequency optical fiber laser beams subjected to power amplification into one laser beam, the polarization controller adjusts the polarization state of the combined laser beam, and the nonlinear optical fiber is used for controlling the linewidth of the output laser. The power ratio of the two paths of laser beams injected into the nonlinear optical fiber is adjusted, and therefore, the gain in the nonlinear optical fiber is changed, the output laser linewidth is further controllable, the narrow-linewidth optical fiber laser finally has the advantages of being flexible and controllable in linewidth, large in adjusting range, high in linewidth adjusting precision and the like, and the narrow-linewidth optical fiber laser can beapplied to the aspects of an optical wavelength division multiplexing system, coherent combination, spectrum combination, gravitational wave detection and the like.

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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