Abstract

A continuously tunable far-IR Raman laser has been used to measure the responsivity and the spectral response of uncoated LiTaO₃ pyroelectric detectors between 230 and 530 μm. A striking feature of the spectral response curves is a periodic sequence of maxima and minima, with a modulation factor of ≥75%. Calculations based on the theory of an absorbing Fabry-Perot etalon indicate that these variations correspond to interference fringes produced by multiple reflections at the surfaces of the LiTaO₃ crystal.

© 1989 Optical Society of America

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