Blue light beam combining device and blue light beam combining method based on double gratings

Abstract

The invention discloses a blue light beam combining device and a blue light beam combining method based on double gratings, and relates to the technical field of laser beam combining. The device comprises a blue-light semiconductor laser array, and a fast axis collimating mirror and a slow axis collimating mirror which are provided with preset corresponding parameters, a light beam turning compression element group, a trapezoidal light beam compression element, an inclined-strip-shaped light beam compression element, a light beam deflection element, a double-diffraction grating group and an output coupling mirror which are sequentially arranged along a light path. According to the invention, the quality of blue light beams can be improved, and more light beams can be subjected to spectral beam combination.

Description

technical field [0001] The invention belongs to the technical field of blue light semiconductor lasers, and more particularly, relates to a blue light semiconductor laser array beam combining device and method based on fast and slow axis beam collimation, beam compression and double diffraction grating group spectral combining. A blue light beam combining device with double gratings and a blue light beam combining method. technical background [0002] High-power blue semiconductor lasers have unique advantages in the processing of high-reflectivity materials such as battery electrodes that power automobiles, integrated electronic components, and copper-based components used in aerospace. Since the blue-band laser does not have the problems of difficult manufacturing and welding of pure copper and copper alloys caused by the high reflectivity of infrared lasers, the application of high-power blue semiconductor lasers in the industrial field will have higher efficiency in the ...

AI Technical Summary

Problems solved by technology

However, in the process of spectrally combining semiconductor lasers with a grating, when a laser beam with a certain linewidth is incident on the grating, the dispersion effect of the grating will produce a diffraction effect and increase the beam divergence angle, reducing the beam quality, and When the transmission lens is long, the intermodulation of a single laser beam is caused by the increase of the overall optical path. This diffraction effect will make the beam quality decline more obvious; , it is proposed to add a transmissive grating with the same grating lines on the basis of the previous single grating to form a grating pair. This method can effectively eliminate the beam quality degradation caused by the beam passing through only one grating and the feedback crosstalk between two adjacent laser beams, but this In this way, since the beams are not compressed to reduce the beam spacing, the number of laser light-emitting units that can participate in the beam combination is insufficient and the final output power is insufficient.

[0006] At present, there are few examples of spectral beam combining of blue light semiconductor laser arrays in China, so the current beam combining equipment and methods are still unable to output blue light lasers with high power and high beam quality at the same time.

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