Different regimes of strong-field dynamics of atoms in intense low-frequency laser pulses

2011 ◽  
Vol 58 (13) ◽  
pp. 1195-1205 ◽  
Author(s):  
A.M. Popov ◽  
O.V. Tikhonova ◽  
E.A. Volkova
Keyword(s):  
Strong Field ◽  
Low Frequency ◽  
Laser Pulses ◽  
Frequency Laser

scholarly journals Control of strong-field ionization with two-color laser pulses

2015 ◽  
Vol 635 (9) ◽  
pp. 092122
Author(s):  
N Camus ◽  
L Fechner ◽  
D G Arbó ◽  
C Lemell ◽  
S Nagele ◽  
...  
Keyword(s):  
Strong Field ◽  
Laser Pulses ◽  
Field Ionization ◽  
Strong Field Ionization

Tunneling Ionization Study of Linear Molecules in Strong-Field Laser Pulses

2020 ◽  
Vol 65 (1-2) ◽  
pp. 57-68
Author(s):  
V. Petrović ◽  
◽  
H. Delibašić ◽  
I. Petrović ◽  
◽  
...  
Keyword(s):  
Ionization Potential ◽  
Strong Field ◽  
Laser Pulses ◽  
Ionization Rate ◽  
Rate Equations ◽  
Tunneling Ionization ◽  
Low Intensity ◽  
Linear Molecules ◽  
Experimental Findings ◽  
Ionization Rates

"We theoretically studied photoionization of atoms and molecules in the frame of Perelomov-Popov-Terent’ev (PPT) and Ammosov-Delone-Krainov (ADK) theories. Strong-field single ionization of two diatomic molecules, N_2 and O_2, are studied and compared to Ar and Xe atoms, using an 800 nm Ti:sapphire laser in the 3×〖10〗^13 to 1×〖10〗^15 Wcm^(-2) intensity range. To eliminate disagreement between theoretical and experimental findings in a low intensity fields (~6×〖10〗^13 Wcm^(-2)), we considered the influence of shifted ionization potential. Including these effects in the ionization rates, we numerically solved rate equations in order to determine an expression for the ionization yields. The use of modified ionization potential showed that the ionization yields will actually decrease below values predicted by original (uncorrected) formulas. This paper will discuss the causes of this discrepancy. Keywords: tunneling ionization, ionization rate, ionization yield, molecules. "

scholarly journals Theoretical framework for classification and prediction of ultrafast and strong-field phenomena in solids

2019 ◽  
Vol 205 ◽  
pp. 04013
Author(s):  
Stanislav Yu. Kruchinin ◽  
Ferenc Krausz ◽  
Vladislav S. Yakovlev
Keyword(s):  
Density Matrix ◽  
Time Scales ◽  
Strong Field ◽  
Laser Pulses ◽  
Theoretical Framework ◽  
Ultrashort Laser Pulses ◽  
Matrix Equations ◽  
Electron Dynamics ◽  
Characteristic Energy ◽  
Ultrashort Laser

We study the characteristic energy and time scales describing the coherent electron dynamics and decoherence phenomena in solids interacting with ultrashort laser pulses. Our analysis resulted in the derivation system of dimensionless adiabaticity parameters and derivation of the non-Markovian density-matrix equations applicable on arbitrary short timescales.

Dispersion relations, rays and ray splitting in magnetohelioseismology

2005 ◽  
Vol 364 (1839) ◽  
pp. 333-349 ◽  
Author(s):  
P.S Cally
Keyword(s):  
Strong Field ◽  
Mode Conversion ◽  
Low Frequency ◽  
Active Regions ◽  
Dispersion Relations ◽  
Near Surface ◽  
Wave Splitting ◽  
Proper Account ◽  
Acoustic Dispersion ◽  
Field Inclination

Local helioseismology seeks to probe the near surface regions of the Sun, and in particular of active regions. These are distinguished by their strong magnetic fields, yet current local techniques do not take proper account of this. Here, we first derive appropriate gravito-magneto-acoustic dispersion relations, and then use these to examine how acoustic rays entering regions of strong field split into fast and slow components, and the subsequent fates of each. Specifically, two types of transmission point, where wave energy can transfer from the fast to slow branch (or vice versa) are identified; one close to the equipartition level where the sound and Alfvén speeds coincide, and one higher up near the acoustic cutoff turning point. This second type only exists for rays of low frequency or low l though. In accord with recent studies of fast-to-slow mode conversion from the perspective of p-modes, magnetic field inclination is found to have significant consequences for wave splitting.

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