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Proceedings Paper

Optical limiting studies of disperse orange and disperse yellow in PMMA-MA matrix
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Paper Abstract

With the use of high power lasers in varied applications, search for optical limiting materials has become very important to protect the eyes and other sensors. These materials are based on the principle of reverse saturable absorption (RSA) when absorption cross-section for excited state becomes more than the ground state. In such cases transmittance goes down as we increase the intensity. In this paper, we report the experimental results on two dye doped polymer films - Disperse Orange-25 and Disperse Yellow-7 prepared using hot-press technique. For both the dyes Polymehtylmethacrylate-Methacrylic acid (PMMA-MA) has been chosen as a matrix because of its easy availability and easiness of processing. We have used Z-scan technique with CW laser @ 532 nm to study nonlinear optical properties of these materials. The closed aperture Z-scan shows positive nonlinear refraction for both the materials. While the open aperture Z-scan gives RSA at higher intensities for both the samples, making them candidates for optical limiting.

Paper Details

Date Published: 14 February 2003
PDF: 7 pages
Proc. SPIE 4797, Multiphoton Absorption and Nonlinear Transmission Processes: Materials, Theory, and Applications, (14 February 2003); doi: 10.1117/12.453540
Show Author Affiliations
Ravindra Prathap Singh, Physical Research Lab. (India)
P. Sreeramana Aithal, Physical Research Lab. (India)
Srinivas Institute of Advanced Sciences (India)
Narayana Rao, Univ. of Hyderabad (India)

Published in SPIE Proceedings Vol. 4797:
Multiphoton Absorption and Nonlinear Transmission Processes: Materials, Theory, and Applications
A. Todd Yeates; Christopher M. Lawson; Kevin D. Belfield; Stephen J. Caracci; Francois Kajzar; A. Todd Yeates; Kevin D. Belfield; Stephen J. Caracci, Editor(s)

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