Umklapp Optical Third-Harmonic Generation in Cholesteric Liquid Crystals

8 March 1971

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 26 (10) , 538-541
https://doi.org/10.1103/physrevlett.26.538

Abstract

We have observed, in cholesteric liquid crystals, optical umklapp processes with which the third-harmonic generation is phase matched. We show that phase-matched third-harmonic generation can be used to measure both the width and the asymmetry of ultrashort pulses.

Keywords

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