Title

Investigation Of Two-Photon-Induced Polarization Spectroscopy Of The A-X (1,0) Transition In Molecular Nitrogen At Elevated Pressures

Abstract

Two-photon-induced polarization spectroscopy of molecular nitrogen in the a 1Πg(v’ = 1) ← X 1Σ+g (v” = 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 1 ions created in the multiphoton absorption process at the high laser intensities required. © 2000 Optical Society of America.

Publication Date

2-20-2000

Publication Title

Applied Optics

Volume

39

Issue

6

Number of Pages

1042-1048

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1364/AO.39.001042

Socpus ID

0042687750 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0042687750

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