Paper Information

Journal:   JOURNAL OF THEORETICAL AND APPLIED PHYSICS (IRANIAN PHYSICAL JOURNAL)   SEPTEMBER 2010 , Volume 4 , Number 2; Page(s) 21 To 25.
 
Paper: 

NONLINEAR OPTICAL RESPONSE AND OPTICAL PROPERTIES MODIFICATION IN CROWN B270 GLASS SAMPLE WITH FS LASER PULSES

 
 
Author(s):  MOGHADDAM SARAY A.*, JAMSHIDI GHALEH K.
 
* DEPARTMENT OF PHYSICS, SCIENCE FACULTY, ISLAMIC AZAD UNIVERSITY, ISLAMSHAHR BRANCH, ISLAMSHAHR, IRAN
 
Abstract: 

In this paper, the nonlinear optical responses and the optical properties modification in crown B270 glass are studied under irradiations of the CPA Ti: Sapphire laser ( t = 200 ¦s, l = 800 nm and R = KHz). The single beam zscan method and هInput-output measurement are applied to study the nonlinearity. The nonlinear refraction and absorption coefficient of the sample are evaluated at three different 4, 5 and 6 ´ 102 GW/cm2 incident intensities. The pairs of {n2 (´10-7 cm2/GW), b (´10-3 cm/GW)} are measured to be {2.06, 4.33}, {2.33, 5.82} and {2.59, 7.21}, respectively. The intensity dependency of the nonlinear refraction and absorption coefficient indicates that the higher order nonlinear responses are also encountered. The Optical power limiting threshold of the sample is measured to be about 30 mJ. An erasable modification, called color centers, is observed in the sample after irradiation with 800 nm (IR) femtosecond laser pulses.

 
Keyword(s): NONLINEAR OPTIC, FEMTOSECOND LASER PULSES, OPTICAL PROPERTIES MODIFICATION: CROWN B270 GLASS
 
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