A class of organic molecules which will photoisomerize when irradiated into resonances in the 2.7-3.4 micron region is described. These are single photon reactions which can have a high quantum efficiency and which can lead to optical nonlinearities. The optical properties of host-guest materials containing such photoisomerizable compounds are discussed.
James S. Shirk,
"Infrared Nonlinear Optical Materials Based On Molecular Photoisomerization", Proc. SPIE 0878, Multifunctional Materials, (3 May 1988); doi: 10.1117/12.943957; https://doi.org/10.1117/12.943957