Journal
OPTICS LETTERS
Volume 38, Issue 11, Pages 1906-1908Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.38.001906
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Funding
- RFBR [12-02-31894, 12-02-01368, 12-02-31341, 12-02-33029]
- Council of the President of the RF for Support of Young Scientists [N5996.2012.2]
- Leading Scientific Schools [6897.2012.2]
- Ministry of Education and Science of the RF [N8393]
- Dynasty Foundation
- Huazhong University of Science and Technology, Wuhan, China
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1229968] Funding Source: National Science Foundation
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We demonstrate that the two basic physical mechanisms of terahertz (THz) generation in a femtosecond filament, namely, the free electron photocurrent and the nonlinear polarization of neutrals, can be identified through the spectral analysis of THz radiation. The contribution from the photocurrent peaks at the units of THz, while the neutrals yield the peak at the tens of THz. We suggest the practical implementation of such spectral analysis by varying the initial transform-limited laser pulse duration. (C) 2013 Optical Society of America
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