A critical review of laser induced nonlinear index changing mechanisms in liquid crystals is presented. In some azo-compound doped nematic films, we have observed nonlinear index coefficient ≫ 1 cm2/W. The supra optical nonlinearities are attributed to photorefractivity, order parameter modification and dopant-nematic intermolecular torques. Using these nematic films, we show that it is possible to perform image processing with μW/cm2 optical intensity, and optical limiting with μW power lasers.
|Original language||English (US)|
|Number of pages||9|
|Journal||Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals|
|State||Published - Jan 1 2001|
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics