WIAS Preprint No. 1488, (2010)
Ultrafast spatio-temporal dynamics of terahertz generation by ionizing two-color femtosecond pulses in gases
Authors
- Babushkin, Ihar
- Kuehn, Wilhelm
- Köhler, Christian
- Skupin, Stefan
- Bergé, Luc
- Reimann, Klaus
- Woerner, Michael
- Herrmann, Joachim
- Elsaesser, Thomas
2010 Mathematics Subject Classification
- 78A60 35Q61 35Q60
2008 Physics and Astronomy Classification Scheme
- 42.65.Re, 32.80.Fb, 52.50.Jm, 42.65.-k
Keywords
- THz light generation, Photoionization, Ultrashort optical pulse propagation
DOI
Abstract
We present a combined theoretical and experimental study of spatio-temporal propagation effects in terahertz (THz) generation in gases using two-color ionizing laser pulses. The observed strong broadening of the THz spectra with increasing gas pressure reveals the prominent role of spatio-temporal reshaping and of a plasma-induced blue-shift of the pump pulses in the generation process. Results obtained from (3+1)-dimensional simulations are in good agreement with experimental findings and clarify the mechanisms responsible for THz emission.
Appeared in
- Phys. Rev. Lett., 105 (2010) pp. 053903/1-053903/4.
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