Optimum chirp for efficient terahertz generation from two-color femtosecond pulses in air

被引：46
|
作者：
Zhang, Zhen [1 ]
Panov, N. [2 ,3 ,4 ]
Andreeva, V. [3 ,5 ]
Zhang, Zhelin [1 ]
Slepkov, A. [3 ]
Shipilo, D. [2 ,3 ,4 ]
Thomson, M. D. [6 ]
Wang, Tie-Jun [7 ]
Babushkin, I. [8 ]
Demircan, A. [8 ]
Morgner, U. [8 ]
Chen, Yanping [1 ]
Kosareva, O. [2 ,3 ,4 ,9 ]
Savel'ev, A. [2 ,3 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Phys & Astron, Collaborat Innovat Ctr IFSA, Key Lab Laser Plasmas,Minist Educ, Shanghai 200240, Peoples R China
[2] Lomonosov Moscow State Univ, Int Laser Ctr, 1-62 Leninskie Gori, Moscow 119991, Russia
[3] Lomonosov Moscow State Univ, Fac Phys, 1-2 Leninskie Gori, Moscow 119991, Russia
[4] Russian Acad Sci, Lebedev Phys Inst, 53 Leninskiy Prospect, Moscow 119991, Russia
[5] Univ Minnesota, Sch Math, Minneapolis, MN 55455 USA
[6] Goethe Univ, Phys Inst, Max von Laue Str 1, D-60438 Frankfurt, Germany
[7] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China
[8] Leibniz Univ Hannover, Inst Quantum Opt, D-30167 Hannover, Germany
[9] Nankai Univ, Inst Modern Opt, Tianjin 300350, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2018年 / 113卷 / 24期
基金：
中国国家自然科学基金; 俄罗斯科学基金会;
关键词：
LASER-PULSES; FILAMENTATION; PROPAGATION; RADIATION; DURATION; POWER;
D O I：
10.1063/1.5053893
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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 2 omega-pulse preserve the overlap with the omega-pulse. The THz yield is extremely sensitive to the temporal overlap: for a 35-fs x-pulse, the yield decreases by an order of magnitude upon a omega-2 omega pulse shift of only 5 fs. Published by AIP Publishing.
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页数：5
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