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A germanium prism coupler has been used to couple a CO2 laser beam into thin AgBr films deposited on NaCl substrates. Thermographic phosphor screens and an infrared scanner were used to detect guided-wave propagation in the films. Measurement of the TE0 and TM0 coupling angles yielded the film index (2.14) and thicknesses. The latter were in excellent agreement with independent thickness measurements.
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McFee et al. (1972) studied this question.
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