Optimum chirp for efficient terahertz generation from two-color femtosecond pulses in air
- 10 December 2018
- journal article
- conference paper
- Published by AIP Publishing in Applied Physics Letters
- Vol. 113 (24) , 241103
Abstract
We compare detailed spatio-temporal propagation simulations with experiments on generation of terahertz (THz) pulses in single filaments with two-color optical excitation, which elucidates the mechanism whereby positively chirped optical pulses lead to the maximum THz yield. The long-wavelength components in the leading edge of the positively chirped 2ω-pulse preserve the overlap with the ω-pulse. The THz yield is extremely sensitive to the temporal overlap: for a 35-fs ω-pulse, the yield decreases by an order of magnitude upon a ω–2ω pulse shift of only 5 fs.Keywords
Funding Information
- Key Project from Bureau of International Cooperation Chinese Academy of Sciences (181231KYSB20160045)
- National Basic Research Program of China (2014CB339801)
- National Natural Science Foundation of China (11474202)
- Deutsche Forschungsgemeinschaft (BA 4156/4-1, MO 850-19/1, MO 850-20/1)
- National Natural Science Foundation of China (11721091, 11774228)
- Russian Science Foundation (16-42-01060)
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