Ultra narrow linewidth low noise high power single frequency fiber laser

Abstract

The invention discloses an ultra narrow linewidth low noise high power single frequency fiber laser which comprises a single mode semiconductor laser pumped source, a polarization-maintaining wavelength division multiplexing device, a coupling output polarization maintaining fiber raster, a high reflection polarization maintaining fiber raster, a wave plate, a high gain fiber, a low reflection narrow linewidth fiber grating, a dichroscope, a heat sink, a sealed air chamber and a fiber clamp and polarization maintaining fiber isolator. A common end of the polarization-maintaining wavelength division multiplexing device connects with the coupling output polarization maintaining fiber raster. The coupling output polarization maintaining fiber raster and the high reflection polarization maintaining fiber raster are etched on a same polarization maintaining fiber or respectively etched on two strips of polarization maintaining fibers with consistent fast and slow shaft directions in connection, the high reflection polarization maintaining fiber raster connects with the high gain fiber through the wave plate, the high gain fiber connects with the low reflection narrow linewidth fiber grating, and the dichroscope in order. According to the invention, a folding composite chamber and a double virtual annular chamber are constructed in a short straight chamber structure, and a single frequency fiber laser with ultra narrow linewidth and polarization-maintaining output is generated.

Description

technical field

[0001] The invention relates to a fiber laser, in particular to a single-frequency fiber laser with ultra-narrow line width, low noise and high power. The line width of the laser is less than hundreds of Hz, and the output power is as high as hundreds of mW. Background technique

[0002] Ultra-low-noise single-frequency lasers have broad application prospects in ultra-high-precision cutting-edge fields such as coherent optical communications, optical atomic clocks, gravitational wave detection, and quantum secure communications because of their narrow spectral linewidth and excellent laser coherence characteristics. To improve the detection distance or accuracy of fiber laser, it is necessary to use laser with high coherence performance, so the laser is required to have an ultra-narrow linewidth, such as a single-frequency fiber laser with a linewidth of several hundred Hz and a mW level is required as a seed source. Generally, it is difficult to achieve high...

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