Dispersion of third-order nonlinear optical constants in high-refractive-index glasses associated with two-photon absorption

Akihiro Mito; Hiroki Moriwaki

doi:10.1117/12.349234

26 May 1999 Dispersion of third-order nonlinear optical constants in high-refractive-index glasses associated with two-photon absorption

Akihiro Mito, Hiroki Moriwaki

Author Affiliations +

Proceedings Volume 3610, Laser Material Crystal Growth and Nonlinear Materials and Devices; (1999) https://doi.org/10.1117/12.349234
Event: Optoelectronics '99 - Integrated Optoelectronic Devices, 1999, San Jose, CA, United States

Abstract

The nonlinear optical properties were measured for two high- refractive-index glasses to obtain a general description of the n₂ dispersion for wide-bandgap dielectrics and to select a new reference material for CS₂ which shows pulse-width dependent n₂. We determined the n₂ values of the glasses by Z-scan method in visible region using femtosecond lasers and the values in near infrared region by THG method. We used the n₂ value of fused silica as a standard that was determined precisely from reliable second-order nonlinear constants through two- consecutive cascading process. Dispersions of n₂ were found dominated by two-photon absorption (TPA) and fitted with the empirical equation obtained for semiconductor materials in the longer wavelength region above TPA edge. For shorter wavelength region, discrepancy was observed between calculated and measured values. We also measured the n₂ values using THG, DFWM, Z-scan, and Kerr-shutter methods with different pulse widths and repetition rates. It was found the values coincided well among the methods while CS₂ showed strong dependence.

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Akihiro Mito and Hiroki Moriwaki "Dispersion of third-order nonlinear optical constants in high-refractive-index glasses associated with two-photon absorption", Proc. SPIE 3610, Laser Material Crystal Growth and Nonlinear Materials and Devices, (26 May 1999); https://doi.org/10.1117/12.349234

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