26 May 1999 Dispersion of third-order nonlinear optical constants in high-refractive-index glasses associated with two-photon absorption
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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, Akihiro Mito, Hiroki Moriwaki, 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); doi: 10.1117/12.349234; https://doi.org/10.1117/12.349234
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