High power dual-cladding fiber laser end-pumped method and device

Abstract

The invention discloses a high power double-clad fiber laser end face pump method, which is characterized in that: after coating layer and external layer are removed for the double-clad fiber, firstly, an internal clad layer and a fiber core part (naked fiber end face) are arranged at two focal points with a central hole and confocal concave mirror; secondly, pumping light from the laser is focused through the lens coupling system before incident through a central hole of a first concave mirror; focal spot is also arranged on a focal point of the confocal concave mirror; pumping light enters into the fiber from the fiber end face; when the focal spot is bigger than the end face of the internal clad layer in size, initial pump cannot directly enter the fiber but escaped pumping light oscillates and reflects backward and forward between two confocal concave mirrors and continually enters the fiber. The invention has the advantages of not shaping the pumping light, fully using pumping light escaping outside the fiber and enabling the light reenter the fiber, improving stability of the lens coupling system, easily operating and adapting to the coupling for normal multimode fiber or even single mode fiberwith low cost.

Description

technical field [0001] The invention belongs to the high-power fiber laser pumping technology, and specifically refers to a high-power double-clad fiber laser end-face pumping method and a device thereof. Background technique [0002] Due to its own characteristics of good beam quality, high efficiency, easy heat dissipation and easy realization of high power, high-power double-clad fiber lasers have developed rapidly in recent years, and have become an important part of high-precision laser processing, laser radar systems, high-speed optical communications and target indication. It is an important light source in the field of national defense and military, and has a wider application prospect in the field of national defense and military affairs. Therefore, high-power fiber lasers have been highly valued by governments, scientific circles, and business circles. [0003] To achieve high power output of double-clad fiber lasers, pumping technology is the k...

AI Technical Summary

Problems solved by technology

This requires high processing and assembly precision, and the price of the plastic coupling system is very expensive, which is not conducive to the commercialization of the product

On the other hand, the existing lens coupling method requires very high precision of the entire optical system, and the slight deviation of the coupling system (such as the change of the focal spot position due to vibration) can directly affect the pumping efficiency of the entire system, making the system not Stable, which brings difficulties to system integration

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