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Single-longitudinal-mode operation of a TEA CO2 laser with a modified Fabry-Perot interferometer

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Abstract

A modified Fabry-Perot interferometer has recently1 been used to obtain single-longitudinal-mode (SLM) operation of a TEA CO2 laser. The interferometer consisted of a ZnSe prism positioned between two high-reflectivity metallic mirrors. The reflectivity of such a multipass interferometer has the same spectral behavior as the transmittivity of a conventional Fabry-Perot interferometer. However, the resonant reflectivity of the interferometer1 was only 35%, while theory predicted a reflectivity above 80%; the disagreement was attributed to beam mismatch.

© 1985 Optical Society of America

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