First Terahertz-range Experiments on Pump – Probe Setup at Novosibirsk free Electron Laser

Publication date: 2016 Source:Physics Procedia, Volume 84 Author(s): Yulia Yu. Choporova, Vasily V. Gerasimov, Boris A. Knyazev, Sergey M. Sergeev, Oleg A. Shevchenko, Roman Kh. Zhukavin, Nikolay V. Abrosimov, Konstantin A. Kovalevsky, Vladimir K. Ovchar, Heinz-Wilhelm Hübers, Gennady N. Kulipanov, Valery N. Shastin, Harald Schneider, Nikolay A. Vinokurov A single-color pump-probe system has been commissioned at the Novosibirsk free electron laser. The laser emits a tunable monochromatic terahertz radiation. To prove the proper system operation, we investigated the time-resolved absorption of a sample of n-type germanium doped with antimony, which was previously investigated at the FELBE facility, in the temperature range from 5 to 40 K. The measured relaxation time amounted to about 1.7 ns, which agreed with the results obtained at the FELBE. The results of pump-probe measurements of non-equilibrium dynamics of hot electrons in the germanium crystal at cryogenic temperatures are presented for wavelengths of 105, 141 and 150 μm.

Source: Physics Procedia - December 12, 2016 Category: Physics Source Type: research