Femtosecond time-resolved interferometry for the determination of complex nonlinear susceptibility
- 1 November 1991
- journal article
- Published by Optica Publishing Group in Optics Letters
- Vol. 16 (21) , 1683-1685
- https://doi.org/10.1364/ol.16.001683
Abstract
We propose and demonstrate sensitive interferometry that permits the separation of the real and imaginary parts of the nonlinear susceptibility with a femtosecond time resolution by a single measurement. A special reference interferometer compensates for any fluctuations of the fringe and provides high sensitivity to detect a fringe shift as small as 0.025 rad (λ/250) by averaging only 100 shots with a low-repetition-rate laser. This method can be applied to materials with optical anisotropy and/or absorption with high sensitivity. We apply the method to two materials, CS2 and CdSxSe1−x microcrystallite-doped glass.Keywords
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