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Please use this identifier to cite or link to this item: http://dyuthi.cusat.ac.in/purl/2461

Title: Photoacoustic signal saturation and optical limiting in C70-toluene solution
Authors: Riju, C Issac
Harilal, S S
Geetha K, Varier
Bindhu, C V
Nampoori, V P N
Vallabhan, C P G
Technology
Keywords: photoacoustic and photothermal science and engineering
pulsed photoacoustics
fullerenes
optical limiting.
Issue Date: Feb-1997
Publisher: Society of Photo-Optical Instrumentation Engineers
Abstract: Pulsed photoacoustic studies in solutions of C70 in toluene are made using the 532-nm radiation from a frequency-doubled Nd:YAG laser. It is found that contrary to expectation, there is no photoacoustic (PA) signal enhancement in the power-limiting range of laser fluences. Instead, the PA signal tends to saturate during optical power-limiting phenomenon. This could be due to the enhanced optical absorption from the photoexcited state and hence the depletion of the ground-state population. PA measurements also ruled out the possibility of multiphoton absorption in the C70 solution. We demonstrate that the nonlinear absorption leading to optical limiting is mainly due to reverse saturable absorption.
URI: http://dyuthi.cusat.ac.in/purl/2461
Appears in Collections:Dr.C P Girijavallabhan

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