Abstract

An IR laser of $940\mathrm{nm}$ wavelength induced photochromic reaction in acrylate that contained both spirobenzopyran and rare-earth doped oxide $({\mathrm{Gd}}_2{\mathrm{O}}_2\mathrm{S}:\mathrm{Yb}\mathrm{Er})$. The rare-earth elements were excited by two $940\mathrm{nm}$ photons and emitted a $550\mathrm{nm}$ 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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