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  • Vol. 24, Iss. 14 — Jul. 15, 1999
  • pp: 990–992

Probing nonequilibrium electron distributions in gold by use of second-harmonic generation

K. L. Moore and T. D. Donnelly  »View Author Affiliations


Optics Letters, Vol. 24, Issue 14, pp. 990-992 (1999)
http://dx.doi.org/10.1364/OL.24.000990


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Abstract

Second-harmonic radiation is generated at a gold surface by use of a laser pulse that is varied in duration from 14 to 29 fs and in intensity from 109 to 1011W/cm2 . At laser intensities below 1010W/cm2 , the second-harmonic signal has the expected quadratic dependence on pump-laser intensity; however, at higher intensities, the dependence is supraquadratic. This difference arises because the leading edge of the laser pulse interacts significantly with the gold electrons to create a nonequilibrium, photoexcited distribution. The second-harmonic generation process occurs before electron–electron or electron–phonon collisions can equilibrate the distribution and therefore serves as a probe of the nonequilibrium distribution.

© 1999 Optical Society of America

OCIS Codes
(160.3900) Materials : Metals
(190.4350) Nonlinear optics : Nonlinear optics at surfaces
(320.2250) Ultrafast optics : Femtosecond phenomena

Citation
K. L. Moore and T. D. Donnelly, "Probing nonequilibrium electron distributions in gold by use of second-harmonic generation," Opt. Lett. 24, 990-992 (1999)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-24-14-990


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