Holographic Mirrors for Laser Mode Control
We describe the fabrication of variable reflectivity gratings by an holographic technique and the use of such components as mode selectors in lasers. Gratings with a spatially variable reflectivity profile are produced by the interference of two Gaussian beams on a photoresist material deposited on glass. The gratings have been tested with a Nd: YAG laser and a broad-area semiconductor laser; the beam shape and the modal content of the lasers were improved when the gratings were used as output couplers.
KeywordsGaussian Beam Output Coupler Diffraction Efficiency External Cavity Reflectivity Profile
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