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Ultra narrow linewidth low noise high power single frequency fiber laser

A fiber laser, ultra-narrow linewidth technology, used in lasers, phonon exciters, laser parts, etc., to solve the effect of hole burning effect, not easy mode hopping phenomenon, and improve noise characteristics

Inactive Publication Date: 2012-01-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The narrow-linewidth single-frequency fiber laser provided by the above documents and invention patents has a spatial hole-burning effect in the gain fiber, and can only achieve a linewidth output of the kHz order.

Method used

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  • Ultra narrow linewidth low noise high power single frequency fiber laser
  • Ultra narrow linewidth low noise high power single frequency fiber laser
  • Ultra narrow linewidth low noise high power single frequency fiber laser

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The high-gain fiber 6 is a rare-earth-doped phosphate glass single-mode fiber, which is used as the gain medium of the fiber laser. The length can be selected according to the laser output power of the device and the reflection spectrum width of the coupling output polarization-maintaining fiber grating 3. In this example, it is 1.0 cm, generally 0.5~10 cm. The high-concentration luminescent ions doped in the core of the high-gain fiber 6 are erbium and ytterbium, and the doping concentrations of erbium and ytterbium rare earth ions are 2.5×10 20 ions / cm 3 , 5.0×10 20 ions / cm 3 , generally greater than 1×10 19 ions / cm 3 . The fiber core diameter is 3-10 μm, which is 6.0 μm in this example. The core matrix composition of high-gain optical fiber 6 is phosphate glass, and its composition is: 70P 2 o 5 -8Al 2 o 3 -15BaO-4La 2 o 3 -3Nd 2 o 3 . Rare earth ions are uniformly doped at a high concentration in its core. High-gain optical fiber 6 is made of preform...

Embodiment 2

[0030] The high-gain fiber 6 is a rare-earth-doped phosphate glass single-mode polarization-maintaining fiber, which is used as the gain medium of the fiber laser. The length can be selected according to the laser output power of the device and the reflection spectrum width of the coupled output polarization-maintaining fiber grating 3. In this example 1.0cm, generally 0.5~10cm. The uniformly doped high-concentration luminescent ion of the high-gain fiber 6 core is ytterbium, and the doping concentration of ytterbium ions is 7.5×10 20 ions / cm 3 , generally greater than 1×10 19 ions / cm 3 . The core diameter of the high-gain fiber 6 is 8 μm, generally 1-10 μm. The polarization characteristics of the panda-eye structure are designed. The two panda eyes are arranged symmetrically and have the same size. The warp size is 16 μm, generally 10-20 μm is acceptable, and the cladding diameter is 125 μm, generally 125-400 μm is acceptable. The core matrix composition of high-gain opt...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/16H01S3/081H01S3/10
Inventor 徐善辉杨中民张伟南张勤远邱建荣
Owner SOUTH CHINA UNIV OF TECH
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