External focusing effect on terahertz em
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T.-J. Wang; C. Marceau; S. Yuan; Y. Chen; Q. Wang; F. Théberge; M. Châteauneuf;
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Article
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2010
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John Wiley and Sons
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English
⚖ 113 KB
A systematic investigation of external focusing effect on terahertz (THz) emission from a two-color femtosecond laser-induced filament in air is demonstrated. By collecting the THz emission precisely under different external focusing conditions, an optimum external focal length around 50 cm was obse