Beam combining optical device

Abstract

A beam combining optical device disclosed by the present invention comprises an optical medium body which comprises an input surface used for guiding the light beams to irradiate to a grating layer; afirst reflecting surface and a second reflecting surface which are positioned at the two sides of the grating layer and are used for enabling the incident light beams with different wavelengths to bepropagated back and forth between the first reflecting surface and the second reflecting surface to guide each light beam to propagate along the length direction of the grating layer. Each light beamis diffracted through the grating layer in the path that each light beam propagates from the first reflecting surface to the second reflecting surface or propagates from the second reflecting surfaceto the first reflecting surface each time, the grating layer is used for diffracting the light beams of different wavelengths which are incident to the grating layer at each time, so that the spacingdistance of the light beams is reduced, and the included angle of the propagation direction is reduced. The light beams are converged into one beam after being diffracted for multiple times and are outputted by the output surface. The beam combining optical device can compress the wavelength interval of the combined unit beams, increase the number of the combined unit beams, and facilitate the improvement of the beam combining power and brightness.

Description

Technical field [0001] The invention relates to the technical field of spectral beam combining, in particular to a beam combining optical device. Background technique [0002] Laser beam combining is to couple multiple unit laser beams into a single laser, which is the key to increasing laser power and increasing laser brightness. According to the principle of beam combining, it can be divided into coherent beam combining and incoherent beam combining. Coherent beam combining is mainly in the research stage due to the difficulty of technical realization. Incoherent beam combining is currently widely used in the laser field. [0003] Incoherent beam combining is based on the optical field, polarization or spectral characteristics of the laser. It is specifically divided into spatial combining, polarization combining and wavelength combining. Spatial combining can effectively increase the laser power, but at the same time deteriorate the beam quality and reduce the laser Brightness;...

AI Technical Summary

Problems solved by technology

However, the current spectral beam combining structure is mainly based on the single diffraction of a single-piece diffraction grating. Due to the limitation of the grating's dispersion capability, it is difficult to further compress the wavelength interval of the beam combining, and the beam combining power and brightness improvement are limited.

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