Abstract

An IR laser of 940โ€‰nm 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 940โ€‰nm photons and emitted a 550โ€‰nm 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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