Efficient residual pumping light attenuation method

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...

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