Super-narrow-linewidth single-frequency Q-switched pulse fiber laser

A fiber laser, ultra-narrow linewidth technology, applied in lasers, laser parts, phonon exciters, etc., can solve the problems affecting laser stability, uneven heat distribution of gain medium, etc., and achieve active intra-cavity Q-switching Effect

Inactive Publication Date: 2014-10-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
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Problems solved by technology

However, limited by the technical noise caused by the spatial hole-burning effect in the cavity, the linewidth of short straight-cavity single-frequency fiber lasers is generally on the order of kilohertz
In addition, the spatial hole-burning effect also makes the heat distribution in the gain medium uneven, and finally affects the stability of the laser during free operation.

Method used

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  • Super-narrow-linewidth single-frequency Q-switched pulse fiber laser
  • Super-narrow-linewidth single-frequency Q-switched pulse fiber laser

Examples

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Effect test

Embodiment 1

[0030] The central reflection wavelength of the slow axis (fast axis) of the polarization-maintaining narrow-band fiber filter 4 coupling output grating in this example is the laser output wavelength of 1549.92 nm, and its wavelength can be selected within the range of 1525-1650 nm. The wavelength reflectance is 10-95%, and the central wavelength reflectance of this example is 55%. The central reflection wavelength of the fast axis (slow axis) of the high-reflection grating in the polarization-maintaining narrow-band fiber filter 4 is the laser output wavelength of 1549.92 nm, and its wavelength can be selected within the range of 1525-1650 nm. The central wavelength reflectivity is greater than 99.95%. The dichromatic mirror 6 is coated with a thin film on the surface of the cavity mirror, and its material is generally MgO. The reflectance of the thin film to the laser signal wavelength of 1549.92 nm is greater than 95%, and the transmittance to the pump wavelength of 980 nm ...

Embodiment 2

[0034] The central reflection wavelength of the slow axis (fast axis) of the polarization-maintaining narrow-band fiber filter 4 coupling output grating in this example is the laser output wavelength of 1063.92 nm, and its wavelength can be selected within the range of 1000-1120 nm. The central wavelength reflectance is 10 to 95%, and the central wavelength reflectance in this example is 65%. The central reflection wavelength of the fast axis (slow axis) of the high-reflection grating in the polarization-maintaining narrow-band fiber filter 4 is the laser output wavelength of 1063.92 nm, and its wavelength can be selected within the range of 1000-1120 nm. Example central wavelength reflectance greater than 99.95%. The dichroic mirror 6 is coated with a film on the surface of the cavity mirror, and its material is generally MgO. The reflectance of the film to the laser signal wavelength of 1063.92 nm is greater than 95%, and the transmittance to the pump wavelength of 980 nm is...

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Abstract

The invention discloses a super-narrow-linewidth single-frequency Q-switched pulse fiber laser. The super-narrow-linewidth single-frequency Q-switched pulse fiber laser comprises a single-mode semiconductor pump laser, a polarization-maintaining narrow-band optical fiber filter, a piezoelectric actuator, a full-fabric wave plate, a high-gain optical fiber and a dichroic mirror, wherein the high-gain optical fiber is a rare-earth-doped phosphate single-mode glass optical fiber, output laser light generated by the single-mode semiconductor pump laser serves as a pump light source, the polarization state of signal light in a cavity is controlled through the full-fabric wave plate, homogenization of strong light in the gain optical fiber is achieved through coupling and superposition of opposite polarization states, and selection of a single longitudinal mode of the laser light is achieved through the polarization-maintaining narrow-band optical fiber filter and the dichroic mirror. According to the super-narrow-linewidth single-frequency Q-switched pulse fiber laser, the length of the full-fabric wave plate is changed through the piezoelectric actuator, transmission loss of the laser light in the cavity can be controlled, and output of single-frequency Q-switched pulse laser light is achieved.

Description

technical field [0001] The invention relates to a fiber laser, in particular to an ultra-narrow linewidth single-frequency Q-switched pulse fiber laser. [0002] Background technique [0003] Narrow linewidth single-frequency pulsed lasers have broad application prospects in ultra-high-precision cutting-edge fields such as nonlinear frequency conversion, lidar and remote sensing. There are many schemes to realize narrow-linewidth single-frequency pulse laser, including using an acousto-optic / electro-optic modulator to modulate the intensity of the single-frequency laser signal outside the cavity, or using a short straight cavity Q-switched structure. The energy loss of the former method is very large, so the single-frequency Q-switched pulsed fiber laser with short straight cavity structure has been considered the most promising type. The single-frequency fiber laser with short straight cavity structure has low noise, narrow linewidth, compact structure and easy integratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/11H01S3/115
Inventor 冯洲明徐善辉莫树培杨中民
Owner SOUTH CHINA UNIV OF TECH
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