Erratum: Multiphoton ionization of atoms in two-color laser field and coherent polarization control of terahertz waves (2018 Laser Phys. 28 116001)

Laser Physics ◽  
2021 ◽  
Vol 31 (10) ◽  
pp. 109601
Author(s):  
V M Rylyuk
Keyword(s):  
Laser Phys ◽  
Laser Field ◽  
Multiphoton Ionization ◽  
Terahertz Waves ◽  
Polarization Control

Laser-induced Compton scattering from a bound electron

1992 ◽  
Vol 70 (1) ◽  
pp. 72-77 ◽  
Author(s):  
F. Ehlotzky
Keyword(s):  
Angular Distribution ◽  
Compton Scattering ◽  
Harmonic Generation ◽  
Cross Sections ◽  
Laser Field ◽  
Multiphoton Ionization ◽  
Ionization Threshold ◽  
Powerful Laser ◽  
Bound Electrons ◽  
Bound Electron

We investigate nonrelativistically Compton scattering by an electron bound in hydrogen in a powerful laser field. The corresponding nonlinear rates and cross sections are evaluated in a Keldysh-type of approximation and compared with the rates and cross sections of multiphoton ionization and harmonic generation. We find that multiphoton ionization overshadows Compton scattering by many orders of magnitude, however, Compton scattering may well compete with harmonic generation above the ionization threshold, since, in particular, both processes have the same angular distribution and only odd harmonics can be created by bound electrons, while in bound-free Compton scattering all harmonics will be generated.

THEORY OF BARRIER-SUPPRESSION IONIZATION OF ATOMS

1995 ◽  
Vol 04 (04) ◽  
pp. 775-798 ◽  
Author(s):  
V. P. KRAINOV
Keyword(s):  
Laser Field ◽  
Multiphoton Ionization ◽  
Low Frequency ◽  
Ionization Probability ◽  
Theoretical Description ◽  
Tunneling Ionization ◽  
Theoretical Approaches ◽  
Frequency Laser ◽  
Energy And Angular Distributions ◽  
Analytical Expressions

The theoretical description of the ionization of an atom (ion) by external electromagnetic radiation up to now concerned two alternative situations; multiphoton ionization and tunneling ionization. For both cases the formulas describing the ionization probability when the intensity of the laser field is not too strong are well known. However, if the field is strong, then there exists a new channel; the so-called barrier-suppression (or above-barrier) ionization of the atom. How does this process occur? It is obvious that barrier-suppression ionization and sub-barrier tunneling ionization by low-frequency laser field transform smoothly into one another as the field strength F is varied near the value of the barrier-suppression field F BSI . This paper contains a review of various theoretical approaches developed during the last few years, especially analytical considerations. Some new semi-analytical expressions for ionization rates, energy and angular distributions of ejected electrons are also derived.

MANIPULATING THE POLARIZATION OF TERAHERTZ WAVES WITH METAMATERIAL DEVICES

2014 ◽  
Vol 02 (02) ◽  
pp. 1440008 ◽  
Author(s):  
LONGQING CONG ◽  
JIANQIANG GU ◽  
ZHEN TIAN ◽  
RANJAN SINGH ◽  
JIAGUANG HAN ◽  
...  
Keyword(s):  
Polarization State ◽  
Terahertz Waves ◽  
Optical Components ◽  
Polarization Control ◽  
Design Flexibility ◽  
Potential Applications ◽  
Excellent Control ◽  
Terahertz Frequencies ◽  
Control Devices ◽  
Increasing Demand

As the potential applications of terahertz science and technology become extremely important, there is an increasing demand for improved terahertz optical components. One of such devices on demand is the class of polarization control devices. Recently, metasurfaces have emerged as designer structures with excellent control, design flexibility, and multifaceted functionalities. Metamaterials offer fascinating prospects for manipulating the polarization state of terahertz waves. Here, we discuss different metamaterial device designs that exhibit properties of perfect linear polarization rotation and linear to either linear or circular polarization conversion at narrowband as well as broadband terahertz frequencies.

Tunneling and multiphoton ionization of atoms in two-color linear and circular laser fields and possibility of coherent polarization control of terahertz waves

2020 ◽  
Vol 34 (29) ◽  
pp. 2050275
Author(s):  
V. M. Rylyuk
Keyword(s):  
Relative Phase ◽  
Coherent Control ◽  
Multiphoton Ionization ◽  
Ionization Rate ◽  
Saddle Point Method ◽  
Beam Polarization ◽  
Thz Radiation ◽  
Imaginary Time ◽  
Terahertz Waves ◽  
Laser Fields

The tunneling and multiphoton ionization of atoms in an intense two-color linearly and circularly polarized laser fields are discussed in the Keldysh theory framework. We use the “imaginary-time” method, where tunneling of the photoelectron is described by the classical equations of motion but with purely imaginary “time.” Together with using of the saddle-point method, this allows to obtain the dependence of the total ionization rate and the net photoelectron current, generated due to the interaction of an intense two-color laser field with an atom, on the ratio of the second and fundamental harmonic amplitudes, their relative phase and an angle between harmonics. Application of the “imaginary-time” method also allows us to specify the parameters maximizing the net photocurrent and to determine the Coulomb correction to the ionization rate. We investigate the properties of polarization and spectral intensity of terahertz (THz) radiation and also the possibility of the coherent control of THz waves polarization in two-color scheme, through the relative phase between harmonics. We theoretically demonstrate that the amplification of THz radiation in the case of parallel co-rotating circular laser pulses is greater than for a combination of circularly and linearly polarized harmonics and provides the most promising conditions for increasing the efficiency of THz emission and coherent control of the THz beam polarization.

scholarly journals Observation of up-conversion luminescence polarization control in Sm3+-doped glass under an intermediate femtosecond laser field

RSC Advances ◽  
2017 ◽  
Vol 7 (22) ◽  
pp. 13444-13450 ◽  
Author(s):  
Ye Zheng ◽  
Wenjing Cheng ◽  
Yunhua Yao ◽  
Cheng Xu ◽  
Donghai Feng ◽  
...  
Keyword(s):  
Rare Earth ◽  
Femtosecond Laser ◽  
Laser Field ◽  
Rare Earth Ions ◽  
Polarization Modulation ◽  
Established Method ◽  
Polarization Control ◽  
Luminescence Polarization ◽  
Doped Glass

The polarization modulation strategy of the femtosecond laser field was shown to be a well-established method to control up-conversion luminescence in rare-earth ions.

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