The electro-optic effect in the crystal ammonium dihydrogen phosphate provides a high-speed light valve with ruggedness, long life, and ease of handling not possessed by the similar Kerr effect in liquids. In this paper the design of a practical sound reproduction unit for making variable density 35-mm tracks will be described. Frequency response of the light valve is flat to over 20 000 cycles, the over-all system being limited to about 10 000 by the slit-width film speed effect. Tests of distortion and sound quality in the sound tracks obtained are described.
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Robert O'B. Carpenter (1953) studied this question.