Optical Review
Print ISSN : 1340-6000
ISSN-L : 1340-6000
Laser-Induced Diffraction Rings from an Absorbing Solution
Kazuhiko OGUSUYoshiaki KOHTANIHeng SHAO
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1996 年 3 巻 4 号 p. 232-234

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We observed multiple diffraction rings of a cw Ar+ laser beam from a nitrobenzene solution of saturable absorber BDN (bis-(4-dimethylaminodithiobenzil)-nickel) caused by the spatial self-phase modulation at low incident optical intensities. We obtained 37 rings for a 200-μm thick sample at an optical intensity of 38 W/mm2. The refractive-index change n and effective nonlinear refractive index n2 were determined from the number of observed rings and by the z-scan technique. We obtained large values of n~0.1 and n2=-2.9×10-5 cm2/W. This large nonlinearity is attributed to a thermal effect resulting from linear absorption.
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© 1996 by the Optical Society of Japan
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