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Polarization dependence of the nonlinear refractive index in dye-doped liquid crystals

H. NEMATI1,* , E. MOHAJERANI1, M. M. DASHTABI1, M. BEHZADI RAD1, N. H. NATAJ1

Affiliation

  1. Laser and plasma Research Institute, Shahid Beheshti University G.C., Evin, Tehran, 1983963113, Iran

Abstract

We report on experimental study of the polarization dependence of nonlinear refractive index in a dye-doped liquid crystal medium. Our work is based on the assumption that a polarized laser beam propagated through a nonlinear medium modifies the optical refractive index inside the material and a probe beam can experience these changes. A mathematical expression has been obtained and solved numerically for Rayleigh-Sommerfeld integral which gives the spatial distribution of the pump laser within the material. The effect of these changes on the pattern of the probe beam with different polarization has been observed..

Keywords

Dye-doped liquid crystals, Polarization dependence, Nonlinear refractive index, Near field diffraction, Rayleigh- Sommerfeld diffraction.

Submitted at: Oct. 28, 2009
Accepted at: Nov. 19, 2009

Citation

H. NEMATI, E. MOHAJERANI, M. M. DASHTABI, M. BEHZADI RAD, N. H. NATAJ, Polarization dependence of the nonlinear refractive index in dye-doped liquid crystals, Journal of Optoelectronics and Advanced Materials Vol. 11, Iss. 11, pp. 1750-1753 (2009)