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Abstract

A device for separating a shorter-wavelength component of a combination-wavelength beam from an orthoganally polarized, longer wavelength component. A combination beam generator produces such a beam which is directed into a positive uniaxial crystal having an input face, an output face, and a pair of parallel faces. Each of the faces is parallel to the crystal axis. The beam enters the crystal through the input face in a predetermined orientation and impinges on the pair of parallel faces at angles greater than the critical angle of the shorter component wavelength and less than the critical angle of the longer component wavelength. The shorter wavelength component is internally reflected on the pair of parallel faces until it exits from the output face. The longer wavelength component is partially externally transmitted at each point of reflection of the shorter wavelength components.

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