The dynamic properties of dichromated gelatin plates are investigated during exposure by illuminating them first by a single plane wave and second by two interfering plane waves produced from an argon-ion laser at 514.5 nm. The grating recorded is shown to be a pure absorption grating. The experimental results obtained for the output beam intensities as a function of time are compared with the predictions of a theoretical model, and reasonable agreement is found. It is further shown that owing to the effect of a humid atmosphere, the recorded grating may self-develop into a phase grating of much higher efficiency.
© 1985 Optical Society of America
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