First Terahertz-range Experiments on Pump – Probe Setup at Novosibirsk free Electron Laser
- Choporova, Yulia Yu.
- Gerasimov, Vasily V.
- Knyazev, Boris A.
- Sergeev, Sergey M.
- Shevchenko, Oleg A.
- Zhukavin, Roman K.
- Abrosimov, Nikolay V.
- Kovalevsky, Konstantin A.
- Ovchar, Vladimir K.
- Hübers, Heinz-Wilhelm
- Kulipanov, Gennady N.
- Shastin, Valery N.
- Schneider, Harald
- Vinokurov, Nikolay A.
DOIAbstract
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
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