Cascaded pumping module and laser of a kind of resonant cavity

Abstract

The invention discloses a resonant cavity shared cascading pump module and a laser. The pump module comprises a disc laser, a beam splitting system, a coupling system (7), a gain material and a reflection system (8) which are arranged in sequence along a direction of a light path. The disc laser comprises a pump light source, a cavity mirror (2) and an active gain mirror (1). The pump light source is used for pumping the active gain mirror (1), thereby generating laser. The laser is reflected by the beam splitting system, is coupled into the gain material through focusing of the coupling system and is reflected by the reflection system (8). The laser is returned according to the original light path. The beam splitting system is used for transmitting required laser and reflecting undesired laser. The invention also discloses the laser with the pump module. According to the resonant cavity shared cascading pump module, the laser generated in the cavity of the disc laser passes through a gain optical fiber repeatedly, so the pump light absorbed by the optical fiber is increased, and the light conversion efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of optoelectronics, and more specifically relates to a cascaded pumping module of a resonant cavity and a laser. Background technique [0002] Same-band pumping, also known as resonant pumping, is a pumping method that can greatly increase the pumping power, reduce the quantum deficit of the laser system, and reduce the thermal effect. At present, the 10kw fundamental mode fiber laser produced by IPG adopts the same-band pumping scheme. [0003] The biggest problem of the existing in-band pumping scheme is that the pump wavelength is not on the absorption peak of the gain material, resulting in a very low absorption coefficient of the gain material for the pump light. For fiber lasers, the current solutions to this problem are: (1) increase the doping concentration; (2) increase the core area; (3) reduce the inner cladding area. But the ensuing problem is that increasing the doping concentration will easil...

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Problems solved by technology

[0005] (1) After the pump light passes through the optical fiber, the spherical reflector is reflected and returns to the optical fiber again; when the pump light emerges from the optical fiber, it is in a ring shape, and some light will be missed through the spherical reflector, causing loss;

[0006] (2) The pump source uses semiconductor pumping, the beam quality is very poor, the brightness is very low, there is no way to let more pump light enter the fiber, so that its output power has an upper limit

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