Terahertz and higher order Brunel harmonics: from tunnel to multiphoton ionization regime in tailored fields

被引：25
作者：
Babushkin, Ihar [1 ,2 ]
Bree, Carsten [3 ]
Dietrich, Christian Markus [1 ]
Demircan, Ayhan [1 ,4 ]
Morgner, Uwe [1 ,4 ]
Husakou, Anton [2 ]
机构：
[1] Leibniz Univ Hannover, Inst Quantum Opt, Hannover, Germany
[2] Max Born Inst, Berlin, Germany
[3] Weierstrass Inst, Berlin, Germany
[4] Hannover Ctr Opt Technol, Hannover, Germany
来源：
JOURNAL OF MODERN OPTICS | 2017年 / 64卷 / 10-11期
关键词：
Photo-ionization; Brunel harmonics; terahertz radiation; multi-colour fields; ABOVE-THRESHOLD IONIZATION; PULSE GENERATION; LASER FIELD; AIR; PHOTOIONIZATION; EMISSION; ELECTRON; ATOMS; GAS;
D O I：
10.1080/09500340.2017.1285066
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Brunel radiation appears as a result of a two-step process of photo-ionization and subsequent acceleration of electron, without the need of electron recollision. We show that for generation of Brunel harmonics at all frequencies, the subcycle ionization dynamics is of critical importance. Namely, such harmonics disappear at the low pump intensities when the ionization dynamics depends only on the slow envelope (so-called multiphoton ionization regime) and not on the instantaneous field. Nevertheless, if the pump pulse contains incommensurate frequencies, Brunel mechanism does generate new frequencies even in the multiphoton ionization regime.
引用
收藏
页码：1078 / 1087
页数：10
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