Journal
OPTICS COMMUNICATIONS
Volume 273, Issue 2, Pages 435-440Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2007.01.035
Keywords
birefringence; azopolymers; two-photon absorption
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In this paper we present optical anisotropy induced by 150-fs laser pulses operating at 775 nm in poly(methyl methacrylate) (PMMA) films doped with Disperse Red 13 (DR13). Two-photon absorption of DR13 induces reversible birefringence in the sample, a feature associated with the molecular orientation caused by isomerization of the azochromophores. No irreversible anisotropy, associated with photobleaching of the chromophore was observed. The slope of 2 obtained for the induced birefringence as a function of the excitation irradiance corroborates the two-photon nature of the process. (c) 2007 Elsevier B.V. All rights reserved.
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