A Bragg grating external cavity laser module beam combining device and beam combining method

Abstract

The invention relates to a beam combining device and a beam combining method of a Bragg grating external cavity laser module. Among them, the beam combining device includes a plurality of light-emitting modules arranged side by side, using Bragg gratings for wavelength locking; the output light is incident on the beam combining element after the focusing optical element for beam combining, part of the beam combining light is reflected by the beam splitting element, and part of it is transmitted , a part of which is incident on the dispersion element at the diffraction angle of the dispersion element, and forms parallel light under the action of the transformation optical element; finally forms a block of light beams with a wavelength corresponding to the light-emitting module on the image acquisition mechanism; through the light emission on the image acquisition mechanism Whether there is a deviation between the block formed by the module and the preset block is used to judge whether the wavelength of the corresponding light-emitting module is locked, which effectively solves the combination problem caused by the inability of the existing multi-light-emitting module beam combining device to judge and detect the locked wavelength. The problem of low beam quality of the beam device, the structure of the beam combining device is simple, the judgment and detection are fast, and the adjustment is convenient.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a beam combining device and a beam combining method for a Bragg grating external cavity laser module. Background technique [0002] High-power laser chips are often used as pump sources for solid-state lasers (such as thin-film, fiber and slab lasers), so their efficiency, spatial and spectral characteristics of laser emission determine the performance of solid-state lasers. High-power laser chips are also used in industrial fields such as direct material processing (such as surface treatment, welding, additive manufacturing, cutting), and show the potential to replace solid-state and fiber lasers. The increase in output power and brightness is the main driving force for the expansion of the application range of direct high-power laser chips. High-power, high-brightness laser output is usually obtained through beam combining technology. [0003] Laser beam combining technology i...

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Problems solved by technology

[0006] However, in the actual use of the above-mentioned VBG grating external cavity laser module beam combination device, due to the deviation between the laser wavelength actually locked by the Bragg grating of each light-emitting module and the preset locked laser wavelength, the combined output of the transmission grating There is a deviation between the laser wavelength contained in the beam light and the laser wavelength contained in the theoretical combined beam light, resulting in a decrease in the quality and power of the combined beam light, but it is difficult to detect or judge the beam combining device of the VBG grating external cavity laser module in the prior art Find out which wavelengths of laser light in the combined beam deviate from the theoretical wavelength laser

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