Nonlinear optical investigation of Gaussian laser beam propagating in a dye-doped nematic liquid crystal

2010 ◽  
Vol 153 (2-3) ◽  
pp. 124-128 ◽  
Author(s):  
S.H. Mousavi ◽  
E. Koushki ◽  
H. Haratizadeh
Keyword(s):  
Liquid Crystal ◽  
Laser Beam ◽  
Nematic Liquid Crystal ◽  
Nonlinear Optical ◽  
Optical Investigation ◽  
Gaussian Laser Beam

CONVECTIVE MOTIONS IN NEMATIC LIQUID CRYSTAL HOMEOTROP AND PLANAR CELLS INDUCED BY GAUSSIAN LASER BEAM

2012 ◽  
Vol 15 ◽  
pp. 129-139 ◽  
Author(s):  
A.K. ALEKSANYAN ◽  
A.K. MINASYAN ◽  
R.S. HAKOBYAN
Keyword(s):  
Liquid Crystal ◽  
Laser Beam ◽  
Theoretical Calculations ◽  
Navier Stokes ◽  
Gaussian Laser Beam ◽  
Planar Cells ◽  
Thermal Origin ◽  
Convective Motions ◽  
Laser Beam Heating ◽  
First Time

Laser beam heating the medium induces instability in the liquid crystal (LC) cell. This instability in conjunction with influence of gravitational force results in convective motions in the cell. In this paper theoretical modeling for studying convection induced by Gaussian laser beam in nematic LC homeotrop and planar cells is presented for the first time. Velocity field and LC director distribution are obtained for various light powers and LC cell sizes by solving Navier-Stokes, heat transfer and director equations simultaneously. The modeling allows us to solve the problems of convections induced by Gaussian laser beam due to Rayleigh-Benard and Marangoni mechanisms as well. There is a good qualitative agreement between theoretical calculations and prior experimental results. The possibility of control and stability of convective motions are studied. Instabilities of the Benard cells are of thermal origin because the Prandtl number for the medium under study is considerably larger than unity.

Sign in / Sign up

Export Citation Format

Share Document