scholarly journals Nonsequential double ionization with mid-infrared laser fields

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Ying-Bin Li ◽  
Xu Wang ◽  
Ben-Hai Yu ◽  
Qing-Bin Tang ◽  
Guang-Hou Wang ◽  
...  
Keyword(s):  
Infrared Laser ◽  
Double Ionization ◽  
Laser Fields ◽  
Mid Infrared ◽  
Nonsequential Double Ionization

e–e recollision dynamics of nonsequential double ionization with mid-infrared laser field

2018 ◽  
Vol 32 (27) ◽  
pp. 1850302 ◽  
Author(s):  
Yingbin Li ◽  
Lingli Mei ◽  
Hongmei Chen ◽  
Jingkun Xu ◽  
Qingbin Tang ◽  
...  
Keyword(s):  
High Intensity ◽  
Impact Ionization ◽  
Infrared Laser ◽  
Double Ionization ◽  
Laser Fields ◽  
Mid Infrared ◽  
Low Intensity ◽  
Wide Range ◽  
The Cross ◽  
Nonsequential Double Ionization

We have investigated the recollision dynamics of correlated electron from nonsequential double ionization (NSDI) with 3200 nm laser fields at a wide range of intensities using a full-dimensional classical ensemble method. The numerical results show that for the mid-infrared laser fields, the double ionization probability versus laser peak intensity still displays a much clear “traditional” knee structure representing NSDI. At low intensity, the electron momentum correlated spectrum along the laser polarization direction shows a V-shaped structure; whereas at high intensity, the spectrum exhibits a clearly cross-shaped structure. We demonstrate that both the V-shaped structure and the cross-shaped structure are the results of extremely asymmetric energy sharing of the two electrons at recollision. Moreover, the most prominent contribution to NSDI is from the second-returning trajectory and the first-returning trajectory is significantly suppressed. What’s more, the mechanism of NSDI is from recollision impact ionization (RII) channel as well as recollision-excitation-with-subsequent-ionization (RESI) channel. We find that at low intensity, only the RII channel contributes to V-shaped structure; whereas at high intensity, both the RII and RESI channels have comparable contribution to the cross-shaped structure. Further, we diagnose the recolliding electron and the bound electron separately by tracing the classical trajectories.

scholarly journals Nonperturbative generation of above-threshold harmonics from pre-excited argon atoms in intense mid-infrared laser fields

2017 ◽  
Vol 5 ◽  
Author(s):  
Guihua Li ◽  
Hongqiang Xie ◽  
Ziting Li ◽  
Jinping Yao ◽  
Wei Chu ◽  
...  
Keyword(s):  
Excited State ◽  
Femtosecond Laser ◽  
Pulse Energy ◽  
Laser Pulses ◽  
Infrared Laser ◽  
Femtosecond Laser Pulses ◽  
Probe Laser ◽  
Laser Fields ◽  
Mid Infrared ◽  
Highly Nonlinear

We experimentally investigate the generation of above-threshold harmonics completely from argon atoms on an excited state using mid-infrared femtosecond laser pulses. The highly nonlinear dependences of the observed signal on the pulse energy and polarization of the probe laser pulses indicate its nonperturbative characteristic.

Single Ionization of Atoms Driven by Ultrafast Intense Mid-Infrared Laser Fields

2018 ◽  
Vol 38 (6) ◽  
pp. 0602001
Author(s):  
林志阳 Lin Zhiyang ◽  
林宝卿 Lin Baoqing ◽  
陈志心 Chen Zhixin
Keyword(s):  
Infrared Laser ◽  
Laser Fields ◽  
Mid Infrared ◽  
Single Ionization

scholarly journals Mechanisms on the Photoelectron Angular Distributions of Atoms Ionized in Mid-Infrared Laser Fields

2014 ◽  
Vol 488 (3) ◽  
pp. 032040
Author(s):  
X M Tong ◽  
P Ranitovic ◽  
D D Hickstein ◽  
M M Murnane ◽  
H C Kapteyn ◽  
...  
Keyword(s):  
Infrared Laser ◽  
Angular Distributions ◽  
Laser Fields ◽  
Mid Infrared ◽  
Photoelectron Angular Distributions

Nonsequential double ionization of helium in IR+XUV two-color laser fields: Collision-ionization process

2016 ◽  
Vol 93 (4) ◽  
Author(s):  
Facheng Jin ◽  
Yuanye Tian ◽  
Jing Chen ◽  
Yujun Yang ◽  
Xiaojun Liu ◽  
...  
Keyword(s):  
Double Ionization ◽  
Ionization Process ◽  
Laser Fields ◽  
Nonsequential Double Ionization
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