Characterization of the third-order nonlinearity of [(CH3-TXP)Cd]Cl

Wenfang Sun; Clare C. Byeon; Michael M. McKerns; Christopher M. Lawson; Shiming Dong; Duo-Yuan Wang; Gary M. Gray

doi:10.1117/12.363869

4 October 1999 Characterization of the third-order nonlinearity of [(CH₃-TXP)Cd]Cl

Wenfang Sun, Clare C. Byeon, Michael M. McKerns, Christopher M. Lawson, Shiming Dong, Duo-Yuan Wang, Gary M. Gray

Proceedings Volume 3798, Power-Limiting Materials and Devices; (1999) https://doi.org/10.1117/12.363869
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

The third-order nonlinear optical properties of a methyl substituted Texaphyrin, [(CH₃-TXP)Cd]Cl, were studied by degenerate four wave mixing and Z-scan techniques using 40 ps laser pulses at 532 nm. The molecular second- order hyperpolarizability ((gamma) ), the excited-state absorption cross section ((sigma) _ex), the nonlinear refractive cross section ((sigma) _t), and the optical limiting performances at both nanosecond and picosecond time scales have been determined. We have also studied the third- order nonlinearity of SiNc, one of the most promising optical limiting materials in literature, for comparison. The (gamma) value for [(CH₃-TXP)Cd]Cl is 6.9 X 10^-31 esu, which is 4 times as larger as that of SiNc. The nonlinearity of [(CH₃-TXP)Cd]Cl is predominantly electronic in origin with picosecond laser pulses. The excited-state absorption cross section ((sigma) _ex) and the nonlinear refractive cross section ((sigma) _t) obtained from the theoretical simulation and calculation of Z-scan results are 7.0 X 10^-17 cm² and 1.7 X 10^-17 cm², respectively. The complex shows strong optical limiting performance via reverse saturable absorption for 5 ns laser pulses. The nonlinear absorption of this molecule for 40 ps laser pulses exhibits a transition from reverse saturable absorption to saturable absorption when the fluence is higher than 0.3 J/cm². These data suggest that this complex and related complexes are a promising class of nonlinear optical materials.

Citation Download Citation

Wenfang Sun, Clare C. Byeon, Michael M. McKerns, Christopher M. Lawson, Shiming Dong, Duo-Yuan Wang, and Gary M. Gray "Characterization of the third-order nonlinearity of [(CH₃-TXP)Cd]Cl", Proc. SPIE 3798, Power-Limiting Materials and Devices, (4 October 1999); https://doi.org/10.1117/12.363869

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