Elsevier

Optics Communications

Volume 111, Issues 1–2, 15 September 1994, Pages 111-115
Optics Communications

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

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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.

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Cited by (0)

1

Center for Laser Science & Engineering, University of Iowa, Iowa 52242, USA.

2

Physics Department, Cavendish Laboratories, University of Cambridge, Madingley Road, Cambridge, UK.

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