On the Sub-Doppler Spectroscopy of Optically Excited Atoms in a Thin Gas Cell

This work continues a theoretical investigation of the capabilities of the well-known method based on using a monochromatic probe light beam in combination with optical pumping of atoms (molecules) of a rarefied-gas medium by a broadband radiation in a thin cell the diameter of which is much larger...

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Bibliographic Details
Published in:Optics and spectroscopy 2018-06, Vol.124 (6), p.763-767
Main Author: Izmailov, A. Ch
Format: Article
Language:English
Subjects:
ABSORPTION
Atom probe analysis
ATOMIC AND MOLECULAR PHYSICS
ATOMS
BEAMS
Broadband
DOPPLER EFFECT
Excitation spectra
EXCITED STATES
Frequency stabilization
Lasers
Light beams
Molecular chains
MOLECULES
MONOCHROMATIC RADIATION
Optical Devices
OPTICAL PUMPING
Optics
Photonics
Physics
Physics and Astronomy
RELAXATION
RESOLUTION
SPECTROSCOPY
Spectroscopy of Atoms and Molecules
Spectrum analysis
STABILIZATION
THICKNESS
VISIBLE RADIATION
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Summary:This work continues a theoretical investigation of the capabilities of the well-known method based on using a monochromatic probe light beam in combination with optical pumping of atoms (molecules) of a rarefied-gas medium by a broadband radiation in a thin cell the diameter of which is much larger than its internal thickness. In contrast to calculations carried out in the previous publications on this method of spectroscopy, here, we consider the case of arbitrary values of pump intensity and thickness of a cylindrical gas cell. Thus, all the possible mechanisms and specificities of velocity selection of atoms in optically excited levels caused by transit-time relaxation of such atoms in gas cells of this kind are analyzed. Within the framework of this approach, sub-Doppler absorption resonances of the probe light beam corresponding to quantum transitions from the upper level excited by optical pumping are investigated. The obtained results can be used in high-resolution spectroscopy of atoms (molecules), as well as for laser-frequency stabilization to established narrow spectral resonances.
ISSN:0030-400X
1562-6911
DOI:10.1134/S0030400X18060103