We study the effects of an intensity dependence in the nonlinear index change coefficient on transient and steady-state optical wave mixing and self-diffractions, using the temperature-dependent thermal index change of a nematic liquid crystal as a model material. We show that the nonsinusoidal index grating created by a sinusoidal optical intensity grating has significant influence on the phases and amplitudes of the multiwave mixing processes. Experimental results on the intensity distribution of the multiorder diffractions in a nematic liquid-crystal film near the phase transition temperature are also presented to illustrate the basic effects.
|Original language||English (US)|
|Number of pages||10|
|Journal||Journal of the Optical Society of America B: Optical Physics|
|State||Published - Apr 1997|
All Science Journal Classification (ASJC) codes
- Statistical and Nonlinear Physics
- Atomic and Molecular Physics, and Optics