A 0.633-μ m laser has been modulated at 964 GHz (311 μ m) and 891 GHz (337 μ m) by a novel phase-matched LiNbO3 electro-optic modulator driven by an HCN laser. The performance of the modulator agrees with calculations based on the radio-frequency electro-optic coefficient. Similar experiments with a CdS modulator were unsuccessful presumably because of the generation of photocarriers.
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Kaminow et al. (1970) studied this question.
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