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Photodarkening and partial photobleaching: application to dichromated gelatin

Serge Caron, Roger A. Lessard, and Pierre C. Roberge

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Abstract

Photodarkening or partial photobleaching of photochromic solid media is described by means of an approximated analytical equation. The equation shows that the effective rate of the photochemical reaction is proportional to the square root of the final transmittance of the illuminated layer. The model is applied to describe the photodarkening of dichromated gelatin at 488 nm.

© 2001 Optical Society of America

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