A lossless, passive technique which isolates the pump and the far-infrared cavities in an optically pumped far-infrared laser system has been applied successfully. The isolator consists of a polarizer and a quarter-wave plate. Pumping is accomplished with a circularly polarized beam, and the resulting circular polarization of the far-infrared output stability without sacrifice of either power or mode quality.
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Mansfield et al. (1980) studied this question.
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