Wavelength tunable coherent laser combined beam system based on double gratings
A technology of coherent beam combining and dual gratings, which is applied in laser devices, semiconductor laser devices, optics, etc., can solve the problems of multiple wavelengths in the spectral beam combining system, the number of combined beams is small, and the outgoing light loses linear polarization characteristics, etc., to achieve beam combining High efficiency and good beam quality
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[0021] The specific implementation process of the wavelength tunable laser coherent beam combining system based on the double grating of the present invention is as follows:
[0022] (1) Each light-emitting unit of the semiconductor laser bar array 1 is an F-P semiconductor laser, and is linearly arranged at equal intervals. Coherent beam combination requires that the polarization direction of each beam is the same, so the polarization direction of the linearly polarized light emitted by the semiconductor laser line array 1 should be along the epitaxial direction, or perpendicular to the epitaxial direction and add a half-wave plate to rotate the polarization direction by 90 degrees, so that The same polarization direction (TE polarization) is still maintained when converging on the Damman grating 3. The rear cavity surface of the semiconductor laser bar 1 is coated with a high reflection film, and the front cavity surface is coated with an anti-reflection film. A one-dimensi...
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