Picosecond-continuum measurements of ultrafast dynamic refractive nonlinearities in a ZnSe interference filter

J. A. Bolger, A. K. Kar, P. Meredith, B. S. Wherrett

Research output: Contribution to journalArticle

Abstract

A powerful technique for studying the excitation dynamics of thin-film condensed matter is demonstrated. The field-enhancement within a Fabry-Pérot etalon, and the sensitivity of such a structure to the optical coefficients of the spacer layer material, is combined with the time and spectral resolution afforded by use of time-delayed picosecond-continuum monitoring. Applied to ZnSe interference-filter material the optoelectronic refractive nonlinearity is identified, however rapid lattice heating is observed leading to dominance of the optothermal nonlinearity (of opposite sign) within 3 ps after photoexcitation. © 1994.

Original languageEnglish
Pages (from-to)111-115
Number of pages5
JournalOptics Communications
Volume111
Issue number1-2
Publication statusPublished - 15 Sep 1994

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