Diagnostic study of four-wave-mixing-based electric-field measurements in highpressure nitrogen plasmas

Walter R. Lempert, Sean P. Kearney, Edward V. Barnat

Research output: Contribution to journalArticlepeer-review

Abstract

We present the results of a diagnostic study of the use of coherent four wave mixing for in situ measurement of an electric field in air or in nitrogen-containing plasmas. Static electric fields in air at a nominal pressure of 625 Torr and temperature of 300K are detected using vibrational CARS of nitrogen. It is shown that the ratio of the infrared signal to the vibrational N2 CARS signal is equal to approximately 10-8 at 8.33 kV/cm, a factor of approximately 50 less than that predicted assuming equal third-order nonlinear susceptibilities. It is also shown that the spatial resolution of a typical collinear geometry measurement is approximately 1cm. Finally, it is shown that achieving sensitivities of the order of 1 kV/cm requires that the coherent Raman pumping be performed in the highly saturated and Stark broadened regime.

Original languageEnglish (US)
Pages (from-to)5688-5694
Number of pages7
JournalApplied Optics
Volume50
Issue number29
DOIs
StatePublished - Oct 10 2011
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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