From Event: SPIE LASE, 2018
A simple scheme for nonlinear refractive index measurement via FROG reconstruction is presented. Samples are measured in weakly focused beam of uJ-level 200 fs pulses. Computing intensity profile and temporal phase for a situation with and without the sample in the beam path yields SPM-induced phase contribution. Through fitting of that phase to intensity profile, n2 of a measured material can be directly calculated.
Different optical materials have been measured (fused silica, calcite, YVO4, BiBO, YAG, CaF2) and are shown to agree well with literature.
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Piotr Kabacinski, Tomasz Michal Kardas, Michal Wierzbicki, and Czeslaw Radzewicz, "Nonlinear refractive index measurement with temporal phase reconstruction (Conference Presentation)," Proc. SPIE 10516, Nonlinear Frequency Generation and Conversion: Materials and Devices XVII, 105160I (Presented at SPIE LASE: January 30, 2018; Published: 5 April 2018); https://doi.org/10.1117/12.2319104.5751425841001.