Wavelength tunable coherent laser combined beam system based on double gratings

Abstract

The utility model discloses a wavelength tunable coherent laser beam system based on double gratings and belongs to the field of laser combined beams. The system comprises a semiconductor laser array, a first lens, a dammam grating, a second lens, a diaphragm, a third lens, a blazed grating and a grating rotary device. The second lens, the diaphragm and the third lens form a space filter. The blazed grating is fixed on the grating rotary device. A group of parallel laser beams emitted by the semiconductor laser array converge to reach the dammam grating, and the dammam grating combines the laser beams. The space filter filters zero order light in the combined laser beams, and the filtered zero order light is used as first grade incident light to form a Littrow structure with the blazed grating. First grade direction reflection light is fed back to the dammam grating along an original light path. The beams are divided after reaching the damman grating, are injected into various light-emitting units of the semiconductor laser array and jointly lock the wavelength and phase positions so as to realize coherent combined beams. The wavelength tunable coherent laser beam system combines a plurality of laser beams into a beam of high-power laser, and has the advantages of being high in reliability and good in laser beam quality, working in a single wavelength mode, and the like.

Description

technical field [0001] The invention relates to the technical field of laser beam combining, in particular to a wavelength tunable laser coherent beam combining system based on a double grating. Background technique [0002] Improving the average brightness of the laser light source is an important goal in the field of laser technology, and an important means to achieve an increase in the average brightness is to increase the output power of the laser. Due to the efficiency of the laser, increasing the laser output power will inevitably generate a lot of heat, and various thermal effects caused by the multiplied heat limit the beam quality and reduce the average brightness. Another important means is to improve the quality of the beam. Therefore, after the generation of adaptive optics, many technologies to improve the quality of the beam, such as adaptive resonator, beam purification, phase conjugation and adaptive compensation for atmospheric effects, etc. have improved th...

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Problems solved by technology

[0006] In order to solve the technical problems existing in the prior art such as the small number of combined beams of polarization combined beams, the loss of linear polarization characteristics of the outgoing light, and the multi-wavelength work of the spectral beam combining system, the present invention provides a wavelength-tunable laser coherent beam combining based on dual gratings system

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