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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 6 — Feb. 20, 2000
  • pp: 1042–1048

Investigation of two-photon-induced polarization spectroscopy of the a–X (1,0) transition in molecular nitrogen at elevated pressures

Clemens F. Kaminski and Thomas Dreier  »View Author Affiliations


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 a1Π g (ν′ = 1) ← X1Σg+ (ν″ = 0) 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

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

History
Original Manuscript: June 21, 1999
Revised Manuscript: November 18, 1999
Published: February 20, 2000

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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