Abstract
A submillimeter wave of 0.34-mm wavelength with peak power of ∼10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-3</sup> watt has been generated in ZnTe by beating the R <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</inf> and R <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> lines of a <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q</tex> -switched ruby laser. As the detector <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">n</tex> -InSb cooled to 1.7°K was used. The dependence of the beat power upon the angle between incident electric fields and the crystallographic axis was in accordance with the <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">43m</tex> symmetry. The observed beat power was smaller, by three orders of magnitude, than the calculated one based on the assumption of collinear plane waves. A theory including the effect of input beam divergence inside the crystal gives a beat power fairly close to the measured value. Some results of auxiliary experiments supporting our viewpoint are also given.
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