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Proceedings Paper

Transient multiple diffraction rings induced by Ar+ laser from poly (methyl methacrylate)(PMMA) polymer doped with organic dyes
Author(s): Abdalla M. Darwish; Sergey S. Sarkisov; William Bryant; Putcha Venkateswarlu; Hossin Ahmed Abdeldayem; Donald O. Frazier
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Paper Abstract

The transient multiple diffraction rings associated with self-phase modulation is observed from PMMA doped with different dyes. The phenomenon is shown to be the result of laser-induced refractive-index change. The experiment is done on three different films fo PMMA doped with sulfrodamine, DCM, and Accriden yellow. The films were fabricated using the spin coating technique. The Ar+ laser at 514 nm was used as the exciting beam to the thin film. The transmitted laser formed interference fringes on a projection screen. It is observed that by increasing the thickness of the film, the number of rings increased. The relation between the thickness of the thin film and the number of rings was found to be different for the three films. This could be explained as the induced thermal refractive index coefficient in each of the samples depending on the strength of absorption of the 541 nm line by each material. It is also found that the third order nonlinear susceptibility enhanced with increasing the thickness of PMMA doped with Accriden yellow. The results also indicate the sensitivity of the transport phenomena in PMMA by changing the guest/host combination and the polymer doped with dye could be optimized for certain applications.

Paper Details

Date Published: 5 October 1995
PDF: 10 pages
Proc. SPIE 2527, Nonlinear Optical Properties of Organic Materials VIII, (5 October 1995); doi: 10.1117/12.222798
Show Author Affiliations
Abdalla M. Darwish, Alabama A&M Univ. (United States)
Sergey S. Sarkisov, Alabama A&M Univ. (United States)
William Bryant, Alabama A&M Univ. (United States)
Putcha Venkateswarlu, Alabama A&M Univ. (United States)
Hossin Ahmed Abdeldayem, Alabama A&M Univ. (United States)
Donald O. Frazier, NASA Marshall Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 2527:
Nonlinear Optical Properties of Organic Materials VIII
Gustaaf R. Moehlmann, Editor(s)

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