Transient reflectivity of gallium films induced by femtosecond laser

E. G. Gamaly; A. V. Rode; O. Uteza; M. Samoc; B. Luther-Davies

doi:10.1016/S0169-4332(02)00401-4

Transient reflectivity of gallium films induced by femtosecond laser

E. G. Gamaly, A. V. Rode^*, O. Uteza, M. Samoc, B. Luther-Davies

^*Corresponding author for this work

Research output: Contribution to journal › Conference article › peer-review

11 Citations (Scopus)

Abstract

The transient reflectivity of gallium films induced by 150fs laser pulses has been studied by the pump-probe technique at the pump intensities of 10 ⁹ -10 ¹² W/cm ² . The time-resolved reflectivity rise of the femtosecond probe in the first 1-4ps after the pump pulse excitation depends strongly on the pump pulse intensity. We demonstrate that the transient electron-phonon collision rate extracted from the reflectivity data is a strong function of the temperature, and thus the laser intensity. This collision rate is drastically different from that observed under equilibrium conditions. The scenario for the microscopic kinetics of the phase transition on the femtosecond time scale is discussed, and new experiments for observation of time-resolved optical properties are proposed.

Original language	English
Pages (from-to)	730-736
Number of pages	7
Journal	Applied Surface Science
Volume	197-198
DOIs	https://doi.org/10.1016/S0169-4332(02)00401-4
Publication status	Published - 2002
Event	Cola 2001 - Tsukuba, Japan Duration: 1 Oct 2001 → 1 Oct 2001

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10.1016/S0169-4332(02)00401-4

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@article{2eb11cf51dd44951ac95bd242d8a694a,

title = "Transient reflectivity of gallium films induced by femtosecond laser",

abstract = " The transient reflectivity of gallium films induced by 150fs laser pulses has been studied by the pump-probe technique at the pump intensities of 10 9 -10 12 W/cm 2 . The time-resolved reflectivity rise of the femtosecond probe in the first 1-4ps after the pump pulse excitation depends strongly on the pump pulse intensity. We demonstrate that the transient electron-phonon collision rate extracted from the reflectivity data is a strong function of the temperature, and thus the laser intensity. This collision rate is drastically different from that observed under equilibrium conditions. The scenario for the microscopic kinetics of the phase transition on the femtosecond time scale is discussed, and new experiments for observation of time-resolved optical properties are proposed.",

keywords = "Femtosecond pump-probe, Gallium films, Transient reflectivity, Ultrafast optical switching",

author = "Gamaly, {E. G.} and Rode, {A. V.} and O. Uteza and M. Samoc and B. Luther-Davies",

year = "2002",

doi = "10.1016/S0169-4332(02)00401-4",

language = "English",

volume = "197-198",

pages = "730--736",

journal = "Applied Surface Science",

issn = "0169-4332",

publisher = "Elsevier B.V.",

note = "Cola 2001 ; Conference date: 01-10-2001 Through 01-10-2001",

}

TY - JOUR

T1 - Transient reflectivity of gallium films induced by femtosecond laser

AU - Gamaly, E. G.

AU - Rode, A. V.

AU - Uteza, O.

AU - Samoc, M.

AU - Luther-Davies, B.

PY - 2002

Y1 - 2002

N2 - The transient reflectivity of gallium films induced by 150fs laser pulses has been studied by the pump-probe technique at the pump intensities of 10 9 -10 12 W/cm 2 . The time-resolved reflectivity rise of the femtosecond probe in the first 1-4ps after the pump pulse excitation depends strongly on the pump pulse intensity. We demonstrate that the transient electron-phonon collision rate extracted from the reflectivity data is a strong function of the temperature, and thus the laser intensity. This collision rate is drastically different from that observed under equilibrium conditions. The scenario for the microscopic kinetics of the phase transition on the femtosecond time scale is discussed, and new experiments for observation of time-resolved optical properties are proposed.

AB - The transient reflectivity of gallium films induced by 150fs laser pulses has been studied by the pump-probe technique at the pump intensities of 10 9 -10 12 W/cm 2 . The time-resolved reflectivity rise of the femtosecond probe in the first 1-4ps after the pump pulse excitation depends strongly on the pump pulse intensity. We demonstrate that the transient electron-phonon collision rate extracted from the reflectivity data is a strong function of the temperature, and thus the laser intensity. This collision rate is drastically different from that observed under equilibrium conditions. The scenario for the microscopic kinetics of the phase transition on the femtosecond time scale is discussed, and new experiments for observation of time-resolved optical properties are proposed.

KW - Femtosecond pump-probe

KW - Gallium films

KW - Transient reflectivity

KW - Ultrafast optical switching

UR - http://www.scopus.com/inward/record.url?scp=17044445537&partnerID=8YFLogxK

U2 - 10.1016/S0169-4332(02)00401-4

DO - 10.1016/S0169-4332(02)00401-4

M3 - Conference article

SN - 0169-4332

VL - 197-198

SP - 730

EP - 736

JO - Applied Surface Science

JF - Applied Surface Science

T2 - Cola 2001

Y2 - 1 October 2001 through 1 October 2001

ER -

Transient reflectivity of gallium films induced by femtosecond laser

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