Efficient residual pumping light attenuation method

A pumping light and pumping technology, which is applied in the coupling of lasers, laser components, and optical waveguides, can solve the problems of easily damaged absorbing materials and long absorption lengths, and achieve the effect of meeting blocking requirements and short attenuation lengths

Inactive Publication Date: 2011-10-05
伍峰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main problem with this method is that it requires a long absorption length, and it is easy to damage the absorbing material when the power of the remaining pump light is high

Method used

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  • Efficient residual pumping light attenuation method
  • Efficient residual pumping light attenuation method
  • Efficient residual pumping light attenuation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0011] Remove the outer cladding 2 with a length L of 5 mm to 50 mm at the pump end of the double-clad fiber 1 where the remaining pumping needs to be leaked, and fabricate a long-period fiber grating 3 with a length L1 in the middle of the fiber section from which the outer cladding is removed. The value should be such that the distance between the two ends of the grating 3 and the outer cladding 2 is not less than 2mm, and at the same time, the attenuation value of the grating 3 meets the requirements of the remaining pump leakage, and its value is between 5dB~30dB. 5 Matches the pump spectrum curve 6 and does not attenuate the signal light 7 of the fiber laser. In order to prevent the leaked remaining pump light from damaging other components, the outer cladding fiber section is removed, and the surface with light absorption and heat dissipation is blackened. The metal sleeve 4 shields the leakage of the remaining pump light.

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PUM

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Abstract

The invention discloses an efficient residual pumping light attenuation method, relating to a method for leakage of optical fiber laser residual pumping light. The method is characterized by comprising the following steps of: removing a cladding layer from the position needing pumping attenuation on an optical fiber; then, manufacturing a long-period optical fiber grating at the middle part of an optical fiber section with the cladding layer being removed so that a bandstop spectral curve of the grating is matched with a pumping spectrum to form attenuation on residual pumping light but not to attenuate a signal light of the optical fiber laser. In order to prevent the leaked residual pumping light from damaging other elements, a metal sleeve which is used for absorbing the leaked pumping light and has favorable heat radiation capability can be sleeved for shielding the pumping light.

Description

technical field [0001] The invention relates to a method for attenuating residual pumping light of a fiber laser. Background technique [0002] High-power fiber lasers are all made of double-clad fibers. The pump light is mainly transmitted in the inner cladding, and is coupled to the core during transmission to be absorbed and form a new laser in the core. The attenuation of the pump light in the optical fiber of this pump mode is an exponential mode. When the pump light attenuates to a certain extent, increasing the fiber length not only cannot effectively improve the output power of the fiber laser, but also increases the cost. Therefore, There is an optimal value in the selection of the length of the active fiber. The limited length of the active fiber means that part of the pump light cannot be absorbed and becomes useless light. This part of useless pump light continues to propagate in the fiber and will often cause damage to subsequent devices. , and then become harm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/091H01S3/067G02B6/34
Inventor 伍峰
Owner 伍峰
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