Investigation of Two-Photon-Induced Polarization Spectroscopy of the a-X (1, 0) Transition in Molecular Nitrogen at Elevated Pressures
Applied Optics, Vol. 39, Issue 6, pp. 1042-1048 (2000)
http://dx.doi.org/10.1364/AO.39.001042
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Abstract
Two-photon-induced polarization spectroscopy of molecular nitrogen in the a1Πg(ν′ =) ← X1Σg+ (ν″ =) system near 283 nm was performed, and its signal dependence investigated over the pressure range from 1.2 to 5 bars at 300 K. A significant increase of the signal intensity with pressure beyond the expected square law for a two-photon process was observed for pure nitrogen. Similar behavior was also found for a constant nitrogen partial pressure with increasing partial pressures of argon buffer gas. In both cases the spectral linewidth of the excited transitions increased dramatically with overall pressure. A possible explanation is given for the observed behavior in terms of contributions to the nonlinear susceptibility of the medium from the population of one-photon resonantly absorbing excited-state nitrogen and ground state N2+ ions created in the multiphoton absorption process at the high laser intensities required.
© 2000 Optical Society of America
[Optical Society of America ]
OCIS Codes
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(230.5440) Optical devices : Polarization-selective devices
(300.6410) Spectroscopy : Spectroscopy, multiphoton
(300.6420) Spectroscopy : Spectroscopy, nonlinear
Citation
Clemens F. Kaminski and Thomas Dreier, "Investigation of Two-Photon-Induced Polarization Spectroscopy of the a-X (1, 0) Transition in Molecular Nitrogen at Elevated Pressures," Appl. Opt. 39, 1042-1048 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-6-1042
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