Measurement of ultrafast optical nonlinearities using a modified Sagnac interferometer
- 1 September 1991
- journal article
- Published by Optica Publishing Group in Optics Letters
- Vol. 16 (17) , 1334-1336
- https://doi.org/10.1364/ol.16.001334
Abstract
A method for the measurement of fast, intensity-dependent refractive-index changes with the use of a modified Sagnac ring interferometer is presented. The measurement is not degraded by slowly responding background index changes. Nonlinear refractive-index changes in an undoped silicon wafer, and in poly-bis toluene sulfonate polydiacetylene and dye-doped polymethyl methacrylate waveguides, were measured with the use of a cw mode-locked Nd:YAG laser.Keywords
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