Coupling device and method for narrow spectral high-power semiconductor laser

Abstract

The invention relates to a coupling device and method for a narrow spectral high-power semiconductor laser. The device is characterized by comprising a semiconductor laser system, a light beam backtrack feedback system, a focusing lens and output optical fiber; the semiconductor layer system consists of a plurality of semiconductor lasers which are provided with fast axis collimation lenses or a plurality of semiconductor lasers which are provided with fast axis and slow axis collimation lenses; the light beam backtrack feedback system comprises a reflective lens group which is arranged in sequence along the laser emission direction and a transmission-type volume bragg grating (VBG) of which position is adjustable; and the focusing lenses is arranged on the output end surface of the transmission-type volume bragg grating so as to focus the light transmitted and output by the transmission-type volume bragg grating, the optical fiber is arranged at the output end of the focusing lens so as to perform optical fiber coupling on the light which is output by the focusing lens. The device and the method provided by the invention have the advantage that the power is expandable.

Description

technical field [0001] The invention belongs to the field of high-power semiconductor lasers, and relates to a shaping device and method for high-power semiconductor lasers, in particular to a coupling method for multiple semiconductor lasers. Background technique [0002] At present, semiconductor lasers and their fiber coupling systems are developing towards high output power, and are being used more and more widely in industrial, medical, military and other fields. The coupling of multiple semiconductor lasers is a kind of integration of multiple semiconductor lasers, and after the optical system combines the beams, the output power can be further improved. Although the output power of multiple semiconductor lasers is improved after coupling, the output bandwidth is wider. In the application of pumping fiber lasers, too wide output bandwidth will greatly reduce the pumping efficiency. [0003] The usual method for single tube and single bar is to place a volume Bragg gr...

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Problems solved by technology

[0004] For a single-tube semiconductor laser or a single-bar laser to achieve a narrow spectral output, only the beam emitted by a single tube or a single bar can be incident on the VBG, and only a single single-tube laser can be fed back to the single channel along the original path of the outgoing light path. In the active area of ​​the tube laser, by adjusting the position and angle of the VBG, only a single tube chip or a single Bar chip can form an external cavity feedback laser with the VBG. The tube semiconductor lasers are fed back to the active regions of the respective single-tube lasers along the original path of the outgoing light path

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