Through the reversible isomerization of trans-cis-trans under the linear polarization light, the molecules of azo materials have the same tropism which is vertical to the polarization of light. This means that azo materials have photo-induced birefringence which is related to optical power and polarization angle of the light. Based on the photo-induced birefringence of azo materials, we design a new type of optically pumped semiconductor vertical external cavity surface emitting laser (OPS-VECSEL) which can control the polarization and frequency of the ejection laser. The functional molecules of azo materials are [3-azo-(4'nitro)]-(9-ethyl)-carbazole (ANECz).
© 2008 Chinese Optics Letters
Yuqi Zhou, Dapeng Zhao, Yajuan Li, and Qingxin Yang, "Design and analysis of optically pumped semiconductor VECSEL with ANECz optical control layer," Chin. Opt. Lett. 6, 855-857 (2008)