Multi-grating structure-based semiconductor laser beam combination device and beam combination method

Abstract

The invention discloses a multi-grating structure-based semiconductor laser beam combination device and beam combination method, relates to the field of semiconductor lasers and aims at solving the problem that existing device and method are poor in quality of semiconductor laser-combined beams. A semiconductor laser group in the device sends out combined beams which are the same in outgoing direction; the combined beams enter a volume Bragg grating group after the actions of a fast-axis collimating lens group and a slow-axis collimating lens group; one part of beams are reflected to corresponding semiconductor lasers to achieve locking of output wavelengths of the semiconductor laser group; the other part of beams enter corresponding reflectors, enter diffraction gratings for overlapping at different incident angles after being reflected through a reflector group, and are diffracted at the same diffraction angle; and outgoing beams of the semiconductor laser group are combined into one beam for outputting, and are coupled to a multi-mode optical fiber through a focus lens. A feedback resonant cavity is short in length; the structural stability is relatively high; assembly and adjustment are simple; and output powers of the semiconductor lasers are greatly improved under the premise of keeping relatively good beam quality.

Description

technical field [0001] The invention relates to the technical field of semiconductor lasers, in particular to a semiconductor laser beam combining device and a beam combining method based on a multi-grating structure. Background technique [0002] Semiconductor lasers have the advantages of small size, light weight, and high efficiency. They have been widely used in laser medical treatment, fiber laser pumping, laser cladding, and laser welding. However, the unit power of the semiconductor laser is small (less than 10 watts), the beam quality is poor (the fast axis is 30 degrees, the slow axis is 10 degrees), and the power density is low (kW / cm2). Watt-level direct light sources are used in laser processing, national defense and other fields. [0003] The existing geometrical optics beam combining method is to combine the space, polarization and wavelength of semiconductor lasers to achieve high power output. The beams emitted by multiple semiconductor lasers are combined ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of poor quality of semiconductor laser beam combining existing in existing beam combining devices and beam combi

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