We report the observation of parametric amplification of far infrared radiation in a crystal of tellurium which was pumped at 10.6 μ by a CO2 laser. A gain of 3 dB was measured at 17.888-μ wavelength which was obtained from a far IR neon laser. Comparison between calculated and measured values of gain show reasonable agreement.
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C. K. N. Patel (1966) studied this question.
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