Abstract
We studied the optical nonlinearities of modified 3,3’ -diethylthiadicarbocyanine iodides (X-DTDCI) in dimethyl sulfoxide (DMSO) solutions (X = H, Cl, Br at meso position) by a pump-probe technique with crossed polarized chirped laser pulses at room temperature. Reverse-saturable-absorption (RSA) with monoexponential lifetimes is observed at 532 nm in all the samples studied. We determined the effective excited-state absorption cross-sections and their lifetimes for all the samples investigated and found that they clearly correlate to the substituent X at the meso position. Empowered by the chirped pulses, a much faster nonlinearity with a decay time of ≈3.1 ps that is much shorter than the laser pulses used, is unveiled in Cl-DTDCI. We expressed both the absorptive and the refractive part of this fast nonlinearity as the equivalent molecular hyperpolarizability lj1212 and found lj1212 = (8.1 + i9.8) × 10-32erg-1.
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Acknowledgement
This work was performed while N. Tang held a National Research Council-Wright Laboratory Research Associateship. The work of D. G. McLean, D. M. Brandelik, and R. L. Sutherland was supported by the Materials Directorate at Wright Lahoratory under Contract F33615-95-C-5423.
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Tang, N., Su, W., Cooper, T.M. et al. Nonlinear Optical Properties of Modified Carbocyanines. MRS Online Proceedings Library 479, 17–22 (1997). https://doi.org/10.1557/PROC-479-17
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DOI: https://doi.org/10.1557/PROC-479-17