Third-order optical nonlinearities of sol-gel silica coating films containing J-like aggregates of a cyanine dye, NK-1967

Zhao-hui Jin; Zhongyu Li; Kazuo Kasatani

doi:10.1117/12.667324

29 December 2005 Third-order optical nonlinearities of sol-gel silica coating films containing J-like aggregates of a cyanine dye, NK-1967

Zhao-hui Jin, Zhongyu Li, Kazuo Kasatani

Author Affiliations +

Proceedings Volume 6028, ICO20: Lasers and Laser Technologies; 60281S (2005) https://doi.org/10.1117/12.667324
Event: ICO20:Optical Devices and Instruments, 2005, Changchun, China

Abstract

The third-order optical nonlinearities and responses of sol-gel silica coating films containing J-like aggregates of a cyanine dye, NK-1967, were measured by the femtosecond degenerate four-wave mixing (DFWM) technique under resonant conditions. While NK-1967 in aqueous solution showed an absorption maximum at 742 nm, J-like aggregates of NK-1967 in sol-gel silica coating films showed that at 877 nm. Though the sol-gel silica coating films were stable at room temperature, they began to decompose after 10 minute irradiation at a laser power of 5 GW / cm². The temporal profiles of the DFWM signal were measured with a time resolution of 0.3 ps, and were found to be almost same as that of CCl₄, i.e., the coherent instantaneous nonlinear response was dominant. The contribution of slow response with decay time constants of ca. 1 ps was very small. The electronic component of the effective third-order optical nonlinear susceptibility of one of the films had a value of ca. 2.0 x 10^-8 esu at 850 nm. The present value for the sol-gel silica coating film containing the J-like aggregates of NK-1967 is four orders of magnitude greater than that of CS₂.

Citation Download Citation

Zhao-hui Jin, Zhongyu Li, and Kazuo Kasatani "Third-order optical nonlinearities of sol-gel silica coating films containing J-like aggregates of a cyanine dye, NK-1967", Proc. SPIE 6028, ICO20: Lasers and Laser Technologies, 60281S (29 December 2005); https://doi.org/10.1117/12.667324

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