Abstract
The principles of use of gratings as laser wavelength-selective end reflectors are reviewed. A useful output beam can be derived from a grating's zeroth-order reflection. This beam moves when the grating is rotated to select various laser wavelengths, but can be made stationary by the addition of auxiliary mirrors. The grating-mirror combination has been applied to a CO(2) laser in the in and to a dye laser in the visible.
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