Paper Information

Journal:   JOURNAL OF THEORETICAL AND APPLIED PHYSICS (IRANIAN PHYSICAL JOURNAL)   SEPTEMBER 2009 , Volume 3 , Number 2; Page(s) 6 To 11.
 
Paper: 

INVESTIGATION OF THICKNESS AND CONCENTRATION EFFECTS ON THE NONLINEAR OPTICAL PROPERTIES OF YELLOW DISPERSE DOPED PMMA

 
 
Author(s):  DORRANIAN D.*, GOLIAN Y., SHAHBAZ TAHMASEBI F., RASHIDIAN M.
 
* LASER LAB., PLASMA PHYSICS RESEARCH CENTER, SCIENCE AND RESEARCH BRANCH, ISLAMIC AZAD UNIVERSITY, TEHRAN, IRAN
 
Abstract: 

Nonlinear optical properties of yellow disperse 211 doped polymethyl-methacrylate (PMMA) solutions in acetone is studied experimentally employing different optical techniques. The effects of thickness of sample as well as its concentration effects are investigated in detail. Experiments are performed using the second harmonic of a continuous Nd-Yag laser beam at 532 nm wavelength and 20 mW power. The effect of nonlinear refractive index of liquid films is obtained by measuring the profile of propagated beam through the samples and their nonlinear refractive index is found to be negative. The optical limiting behavior of samples is investigated by measuring the samples transmission. The third order nonlinearity c3 is measured using Z-scan data. The nonlinear absorption coefficient is calculated using open aperture Z-scan data while its nonlinear refractive index is measured using the closed aperture Zscan data. Real and imaginary parts of the third-order nonlinear optical susceptibility c3 are changed significantly with thickness and concentration.

 
Keyword(s): NONLINEAR OPTICS, REFRACTIVE INDEX, NONLINEAR ABSORPTION, Z-SCAN, BEAM BROADENING, TWO PHOTON ABSORPTION, SATURATION ABSORPTION, SELF FOCUSING, OPTICAL LIMITING
 
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