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 and temperature of are detected using vibrational CARS of nitrogen. It is shown that the ratio of the infrared signal to the vibrational CARS signal is equal to approximately at , 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 . Finally, it is shown that achieving sensitivities of the order of requires that the coherent Raman pumping be performed in the highly saturated and Stark broadened regime.
© 2011 Optical Society of America
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