Beam combining device and beam combining method for Bragg grating external cavity laser module

Abstract

The invention relates to a beam combining device and a beam combining method for a Bragg grating external cavity laser module. The beam combining device comprises a plurality of light emitting moduleswhich are arranged side by side; wavelength locking is carried out by adopting a Bragg grating; output light is transmitted to a beam combining element for beam combining after passing through a focusing optical element; under the action of a light splitting element, one part of the beam combining light is reflected, one part of the beam combining light is transmitted, and one part of the beam combining light is incident on a dispersion element by a diffraction angle of the dispersion element, and parallel light is formed under the action of a conversion optical element; finally image blocksof light beams corresponding to the light-emitting modules in wavelength are formed on an image acquisition mechanism; whether the wavelengths of the corresponding light-emitting modules are locked ornot is judged through whether deviations exist between the image blocks formed by the light-emitting modules on the image acquisition mechanism and a preset image block or not, so that the problem that the light beam quality of the beam combining device is relatively low because an existing beam combining device with the light emitting modules cannot be used for judging and detecting wavelength locking is effectively solved; and the beam combining device is simple in structure, rapid in judgment and detection and convenient to adjust.

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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