Laser Physics Letters
Volume 2, Issue 1 , Pages 21 - 24

Femtosecond photon echo in dye-doped polymer film at liquid nitrogen temperature
S.V. Konturov, V.S. Lobkov, K.M. Salikhov, V.V. Samartsev *, G.M. Safiullin, V.A. Zuikov
Kazan Physical-Technical Institute, Russian Academy of Science, 10 Sibirsky trakt str., Kazan 420029, Russia

email: V.V. Samartsev (samartsev@kfti.knc.ru)

*Correspondence to V.V. Samartsev, Kazan Physical-Technical Institute, Russian Academy of Science, 10 Sibirsky trakt str., Kazan 420029, Russia


Keywords
photon echo ∙ femtosecond pulse ∙ laser ∙ relaxation ∙ self-diffraction ∙ grating


Abstract
The first observation is reported of the primary femtosecond photon echo at a liquid nitrogen temperature in a dyedoped polymer film at a wavelength of 780 nm. Echo signals were generated by pulses with the duration of 130 fs. The echo signal decay can not be described by a simple exponential function. There is a fast decay region below 250-300 fs and a slow decay region at longer time intervals. There were also detected signals of the self-diffraction of exciting pulses on a nonequilibrium population difference grating, induced in resonant medium by these pulses.