Journal
OPTICS LETTERS
Volume 39, Issue 4, Pages 961-964Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.39.000961
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Funding
- National Basic Research Program of China [2011CB808102, 2014CB921300]
- National Natural Science Foundation of China [11127901, 11134010, 61221064, 61275205, 61235003, 11204332, 11304330]
- Program of Shanghai Subject Chief Scientist [11XD1405500]
- Open Fund of the State Key Laboratory of High Field Laser Physics (SIOM)
- Fundamental Research Funds of Jilin University
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We demonstrate unexpectedly strong second harmonic generation (SHG) in argon gas by use of spatio-temporally focused (SF) femtosecond laser pulses. The resulting SHG by the SF scheme at a 75 cm distance shows a significantly enhanced efficiency than that achieved with conventional focusing schemes, which offers a new promising possibility for standoff applications. Our theoretical calculations reasonably reproduce the experimental observations, which indicate that the observed SHG mainly originates from the gradient of non-uniform plasma dynamically controlled by the SF laser field. (C) 2014 Optical Society of America
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