Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/97854
Title: Saturable and reverse saturable absorption of Rhodamine B in methanol and water
Authors: Srinivas, N.K.M.N.
Rao, S.V. 
Rao, D.N.
Issue Date: Dec-2003
Source: Srinivas, N.K.M.N.,Rao, S.V.,Rao, D.N. (2003-12). Saturable and reverse saturable absorption of Rhodamine B in methanol and water. Journal of the Optical Society of America B: Optical Physics 20 (12) : 2470-2479. ScholarBank@NUS Repository.
Abstract: We have investigated nonlinear absorption of Rhodamine B dye in methanol and water near resonance (532 nm) on the higher-energy (435 nm) and lower-energy (600 nm) sides of the absorption band, using an open-aperture Z-scan technique with nanosecond pulses. We observed reverse saturable absorption (RSA) at 435 nm in both of the solvents, and a transition from saturable absorption (SA) to RSA with an increase in either intensity or concentration at 600 nm in methanol. A transition from RSA to SA with an increase in concentration at 600 nm was observed with water as the solvent. We used theoretical analysis based on rate equations to determine the two-photon and excited-state absorption coefficients from the experimental results.
Source Title: Journal of the Optical Society of America B: Optical Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/97854
ISSN: 07403224
Appears in Collections:Staff Publications

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