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Proceedings Paper

Adaptive grating optical limiting with organic photonic materials
Author(s): Hua-Kuang Liu; Luogen Deng; Ruibo Wang; Chunfei Li
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Paper Abstract

The purpose of this paper is to present a grating-assisted nonlinear limiting method based on the principle of index mismatching and grating diffraction. In addition, various nonlinear organic materials have been tested in the optical limiting system. A few examples with experimental results are presented. Using a YAG nanosecond pulse laser at 532 nm as a simulated threat laser source, we tested the optical limiting characteristics of the methyl-red doped nematic liquid crystal films. In the meantime, we observed some quite interesting optical phenomena, such as self-defocusing diffraction rings, dark spots in the far-field behind the cell. Our experimental results presented in the paper show that the methyl-red doped nematic liquid crystal films posses a good optical limiting performance. When the input energy focused on the cell increases from approximately zero micro Joule to approximately 200 micro Joule, the output energy on the far-field exit plane is kept under 1 micro Joule. We will describe a completed optical limiting system with Q-switched frequency-doubled 12- ns Nd:YAG laser, dual-channel detectors, and computer processing units based on Lab-view software and its design considerations.

Paper Details

Date Published: 15 June 2001
PDF: 11 pages
Proc. SPIE 4279, Organic Photonic Materials and Devices III, (15 June 2001); doi: 10.1117/12.429370
Show Author Affiliations
Hua-Kuang Liu, Lumin, Inc. and Oak Ridge National Lab. (United States)
Luogen Deng, Lumin, Inc. and Beijing Institute of Technology (China)
Ruibo Wang, Univ. of California/Santa Barbara (United States)
Chunfei Li, Lumin, Inc. and Harbin Institute of Technology (China)

Published in SPIE Proceedings Vol. 4279:
Organic Photonic Materials and Devices III
Bernard Kippelen; Donal D. C. Bradley, Editor(s)

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