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Method for cooling non-quartz fiber laser device

A technology of quartz fiber and cooling method, applied in lasers, laser parts, phonon exciters, etc., can solve the problems affecting the efficiency and stability of the laser, the heat accumulation at the pump end, and the complexity of the system, so as to reduce the heat accumulation, The effect of improving the coupling efficiency and increasing the damage threshold

Inactive Publication Date: 2011-11-16
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

When cooling non-quartz fiber lasers, non-fusion coupling will cause serious heat accumulation at the pump end, seriously affecting the efficiency and stability of the laser
The system using a sealed liquid chamber is more complicated and difficult to be practical

Method used

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  • Method for cooling non-quartz fiber laser device
  • Method for cooling non-quartz fiber laser device
  • Method for cooling non-quartz fiber laser device

Examples

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Embodiment 1

[0023] A 20 cm long Nd-doped phosphate single-mode fiber is used as the laser gain medium. The structure diagram is as follows figure 1 . The structural parameters of the gain fiber are as follows: outer diameter 130 microns, inner cladding 90 microns, core diameter 5.3 microns, inner cladding numerical aperture 0.32, core numerical aperture 0.15, fiber length 21 cm. The gain fiber is pumped by the aperture coupling method, and the coupling lens The numerical aperture of 0.3, such as figure 1 Shown. The laser cavity is composed of a dichroic mirror 2 (808AR1053HR) at the pump end and a Fresnel reflection at the output end of the gain fiber 1 (R~5%). Considering the repeatability of the experiment, the sealing liquid is a water drop. image 3 To seal the change of the pump light power at the end of the gain fiber before and after the coupling point, it directly reflects the change of the coupling efficiency. It can be seen that the coupling coefficient is increased by 9.7% to 9...

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Abstract

The invention discloses a method for cooling a non-quartz fiber laser device; a liquid matched with a gain fiber in refractive index is used for sealing a contact point between a coupling end of the gain fiber and an endoscope or the end surface of a pumping fiber. The method for cooling the non-quartz fiber laser device can be used for effectively weakening F-P (Fabry-Perot) effect of a coupling point, effectively reducing diffraction losses, restraining the thermal effect of the coupling end and improving luminescent efficiency and stability of the fiber laser device, and has the features of simpleness and convenience.

Description

Technical field [0001] The invention relates to a fiber laser, in particular to a cooling method of a non-silica fiber laser. Background technique [0002] As one of the important members of fiber lasers, non-silica fiber lasers have a wide range of uses. At present, most commercial high-power laser diodes (LDs) use quartz fiber tails to output pump lasers. The thermal performance of quartz fibers and most non-silica fibers are greatly different, which makes the fiber laser system with non-silica fibers as the gain medium fully fiberized. Brings difficulties. Therefore, non-silica fiber laser systems usually use coupling lenses or fiber-fiber collimation to couple pump light. [0003] Due to the characteristics of the material and the limitation of the manufacturing process, the transmission loss of non-silica fiber is usually much larger than that of silica fiber. The heat accumulation problem of gain fiber is one of the main obstacles to obtain high-efficiency and high-power la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/042H01S3/05H01S3/17
Inventor 张光王孟于春雷周秦岭陈丹平
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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