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Littrow prism definition

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used in laser cavities to select oscillation at a particular frequency.  For a particular wavelength the refracted ray on entering the prism travels normally to the exit face.  The exit face is reflectively coated so that this beam travels back along the original path.

See also:

Lock-in amplifier definition
manual override definition
Mach-Zender interferometer definition
LPD definition
magnesia definition