A Device Using Double Gratings to Realize Spectral Beam Combination of Semiconductor Lasers

Abstract

Disclosed is an apparatus for realizing semiconductor laser spectrum beam combination by utilizing double gratings. The apparatus comprises a semiconductor laser light source, a conversion lens, a first diffraction grating, a second diffraction grating and an output coupling mirror, wherein the semiconductor laser light source emits multiple bunches of parallel light; the light beams are subjected to secondary chromatic dispersion through a diffraction effect of the double gratings; and after the light beams are fed back by the output coupling mirror, the laser of each unit is locked in different wavelengths correspondingly to overlay the respective light beams so as to realize high-power and high-luminance single-beam laser output. By taking the double gratings as a diffraction element, the dispersive power is doubled; when the apparatus is applied to laser spectrum beam combination of the semiconductor laser, the spectrum expansion width can be reduced; by adding more beam combination units to a gain curve of a semiconductor laser gain material, the output power can be improved; and meanwhile, by compressing the length of a resonant cavity, the laser can be compact in structure and the stability can be improved.

Description

technical field [0001] The present invention relates to the technical field of semiconductor lasers, and in particular to a semiconductor laser spectral beam combining method that utilizes double gratings to realize beam combining of multiple semiconductor laser units into high-power and high-brightness laser output through external cavity feedback. device. Background technique [0002] Semiconductor lasers have the advantages of low cost, long life, small size, and high reliability. They have broad application prospects in industrial processing, pumping, medical treatment, and communications. Whether the brightness of semiconductor lasers can be further improved is an important factor restricting the future development of semiconductor lasers. The brightness of the laser beam is determined by the output power and beam quality. The higher the power, the better the beam quality and the higher the brightness. The application fields of semiconductor lasers are also wider. [...

AI Technical Summary

Problems solved by technology

In the traditional spectral beam combining technology, there are two ways to compress the spectral broadening: first, reduce the period of the grating, but in order to ensure the diffraction effect of the grating, the minimum period of the grating must be greater than one-half of the light wavelength, which improves the compressed spectrum Limited; second, increase the focal length of the positive lens, but increasing the focal length of the positive lens will increase the cavity length of the beam combining system, multiply the adjustment accuracy and difficulty, and at the same time, the structural size is too large and the stability of the system will be reduced

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