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Optics Letters

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  • Vol. 21, Iss. 3 — Feb. 1, 1996
  • pp: 180–182

Femtosecond time-resolved Z-scan investigations of optical nonlinearities in ZnSe

K. Y. Tseng, K. S. Wong, and G. K. L. Wong  »View Author Affiliations


Optics Letters, Vol. 21, Issue 3, pp. 180-182 (1996)
http://dx.doi.org/10.1364/OL.21.000180


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Abstract

Degenerate (single-color) and nondegenerate (two-color) time-resolved Z-scan techniques, with femtosecond time resolution, have been implemented to measure the magnitude and dynamical processes of the optical nonlinearities of ZnSe. In the time-resolved Z-scan spectra a reversal of sign in the refractive-index change Δn as a function of time delay was observed. A bound electronic contribution with a resolution limited response (~200 fs) gave rise to a positive Δn at zero time delay, whereas a free-carrier contribution resulted in a negative Δn at longer time delays. The free-carrier contribution to Δn has two initial rapid relaxation components with time constants of a few picoseconds and a few tens of picoseconds, respectively. The long-lived carriers also contributed to a slow relaxation component in Δn on a nanosecond time scale.

© 1996 Optical Society of America

History
Original Manuscript: June 28, 1995
Published: February 1, 1996

Citation
K. Y. Tseng, K. S. Wong, and G. K. L. Wong, "Femtosecond time-resolved Z-scan investigations of optical nonlinearities in ZnSe," Opt. Lett. 21, 180-182 (1996)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-21-3-180


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