Paper Title:
Ultrafast Relaxation Character of Nonequilibrium Carriers in GaAs Excited by Femtosecond Laser
  Abstract

Experiment setup of femtosecond laser pump probe was established, the time resolution of time-delay setting reached 67fs. By use of femtosecond laser with width of 30fs and wavelength is 796nm the dependence of transient change of reflectivity on delayed time in GaAs was measured by pump-probe method. By calculating the change of complex index of refraction (%n), free-carrier effect, lattice-temperature and carrier recombination contributions to relaxation curve was analyzed. When the carrier density N is 1.44×1018/cm3, free-carrier contribution to refraction index %nFC is -7.33×10-4, lattice-temperature %nLT is 0.85×10-4. Based on recombination rate equation, recombination lifetime of 980ps was deduced.

  Info
Periodical
Materials Science Forum (Volumes 532-533)
Edited by
Chengyu Jiang, Geng Liu, Dinghua Zhang and Xipeng Xu
Pages
572-575
DOI
10.4028/www.scientific.net/MSF.532-533.572
Citation
M. Zhou, D. Q. Yuan, L. P. Liu, H. X. Liu, N. F. Ren, "Ultrafast Relaxation Character of Nonequilibrium Carriers in GaAs Excited by Femtosecond Laser", Materials Science Forum, Vols. 532-533, pp. 572-575, 2006
Online since
December 2006
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$32.00
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