Equations that describe the photobleaching of photochromic layers illuminated by Gaussian laser beams are given. The photochromic samples are made of thionine, triethanolamine, and polyvinyl alcohol and follow simple kinetics law. Spatial absorbance and time-dependent power transmittance are well described by the developed equations. The model is used to calculate the Gaussian dimension of helium-neon laser beams from kinetics data.
© 2002 Optical Society of America
Original Manuscript: March 27, 2001
Revised Manuscript: October 26, 2001
Published: May 20, 2002
Serge Caron, Roger A. Lessard, and Pierre C. Roberge, "Photobleaching of a solid photochromic medium by a Gaussian laser beam," Appl. Opt. 41, 2907-2913 (2002)