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Absorption of 10.6-μ pump radiation by photoinduced carriers has been found to seriously degrade the performance of Te as a frequency doubler for the CO2 laser. Simultaneous absorption of 5.3- and 10.6-μ photons is shown to be the most likely mechanism for carrier production. The effect limits the peak SHG efficiency to 15% and the average efficiency to 5% under the conditions of this experiment. The effect may also degrade the performance of proposed parametric oscillators using Te as the nonlinear element.
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Gandrud et al. (1970) studied this question.
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