Abstract
We present two beam coupling experiments in aperovskite PbTiO3 unpoled single crystal.[1] The use of ~ 100 fs pulses with fluences in the range of hundreds of GW/cm2 allows efficient excitation, at 620 nm, of at least two photon absorption (TPA) process. A temporal analysis leads to the evidence of a long lived process; its evolution as a function of pump fluence gives a better insight and a more accurate determination of parameters used to describe the general (at zero delay) behavior of this material with respect to intensity. In particular, balance between free carrier excitation by TPA and electrons produced by linear absorption from deep impurity level may be ascertained; furthermore, relative values of σe and σh, electron and hole cross sections, can be characterized more precisely. Comparison with BaTiO3[2] on one hand, and GaAs like semiconductors[3] on the other hand are in this sense very instructive.
© 1992 IQEC
PDF ArticleMore Like This
C.A. Gautier, L. Ait-Talbi, J.C. Loulergue, and J. Etchepare
CWC6 The European Conference on Lasers and Electro-Optics (CLEO/Europe) 1996
D. P. Kien, J. C. Loulergue, and J. Etchepare
FC14 International Conference on Ultrafast Phenomena (UP) 1992
W. Albrecht, Th. Kruse, W. Kütt, and H. Kurz
ThK2 International Quantum Electronics Conference (IQEC) 1992