Abstract

An IR laser of 940nm wavelength induced photochromic reaction in acrylate that contained both spirobenzopyran and rare-earth doped oxide (Gd2O2S:YbEr). The rare-earth elements were excited by two 940nm photons and emitted a 550nm photon, which caused photochromic isomerization of spirobenzopyran. This acrylate turned to its original orange color by either thermal relaxation or ultraviolet irradiation, and was bleached again by IR laser irradiation.

© 2008 Optical Society of America

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