On the potential of mid-IR lasers for generating high harmonics with subnanometer wavelengths in gases

The influence of the magnetic field of a laser pulse and the depletion of bound levels of working-medium atoms on the generation of high harmonics of mid-IR laser radiation in gases is investigated using numerical quantum-mechanical calculations. The maximum attainable spectral widths of high harmon...

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Bibliographic Details
Published in:Quantum electronics (Woodbury, N.Y.) N.Y.), 2013-01, Vol.43 (3), p.211-216
Main Authors: Emelin, M.Yu, Ryabikin, M.Yu
Format: Article
Language:English
Subjects:
atoms
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Constraining
HARMONIC GENERATION
Harmonics
HELIUM
high-harmonic generation
INFRARED RADIATION
ionisation
IONIZATION POTENTIAL
LASER RADIATION
LASERS
LINE WIDTHS
MAGNETIC FIELDS
Mathematical models
mid-IR lasers
PULSES
Quantum electronics
QUANTUM MECHANICS
relativistic effects
RELATIVISTIC RANGE
Spectra
TWO-DIMENSIONAL CALCULATIONS
WAVELENGTHS
X rays
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Summary:The influence of the magnetic field of a laser pulse and the depletion of bound levels of working-medium atoms on the generation of high harmonics of mid-IR laser radiation in gases is investigated using numerical quantum-mechanical calculations. The maximum attainable spectral widths of high harmonics are estimated for model atoms with different ionisation potentials taking into account the aforementioned limiting effects. It is shown (within a two-dimensional model) that high harmonics with wavelengths to several angstroms can be generated by irradiating helium atoms with high-power femtosecond pulses of a laser [5] with a centre wavelength of 3.9 μm. The possibility of observing experimentally relativistic effects using modern desktop mid-IR laser sources is demonstrated.
ISSN:1063-7818
1468-4799
DOI:10.1070/QE2013v043n03ABEH015098