ULTRA SHORT LASER PULSE INDUCED ELECTRON-PHONON DYNAMICS IN CRYSTALS
Pages 75-79
D. Szentesi, A. Juhász-Nagy, A.M. Balint, A. Belyayev, L. Nánai
Abstract
The subpicosecond time resolved spectroscopy is a very versatile tool for identification of carrier (and phonon) dynamics in subsurface layers of solids. We investigate the reflectivity behaviour of TeO2 optical crystals due to irradiation by femtosecond IR laser pulses (pump and probe method) with resolution better than 1 ps. From Fourier spectra of reflected signal obtained we conclude that the appearance of most intense signals depends in different time frames on the angle between pumping beam polarisation and the main crystal axis. This might be convicted with appearance of different phonons and quick rearrangement of short electron-phonon coupling due to dynamic shock waves induced by absorbed laser energy.