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Journal Articles Review of Scientific Instruments Year : 2014

Two-color interferometer for the study of laser filamentation triggered electric discharges in air

Guillaume Point
Leonid Arantchouk
André Mysyrowicz
Aurélien Houard

Abstract

We present a space and time resolved interferometric plasma diagnostic for use on plasmas where neutral-bound electron contribution to the refractive index cannot be neglected. By recording simultaneously the plasma optical index at 532 and 1064 nm, we are able to extract independently the neutral and free electron density profiles. We report a phase resolution of 30 mrad, corresponding to a maximum resolution on the order of 4 × 10 22 m −3 for the electron density, and of 10 24 m −3 for the neutral density. The interferometer is demonstrated on centimeter-scale sparks triggered by laser filamentation in air with typical currents of a few tens of A.
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Dates and versions

hal-01118353 , version 1 (18-02-2015)

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Guillaume Point, Yohann Brelet, Leonid Arantchouk, Jérôme Carbonnel, Bernard Prade, et al.. Two-color interferometer for the study of laser filamentation triggered electric discharges in air. Review of Scientific Instruments, 2014, 85, pp.123101. ⟨10.1063/1.4902533⟩. ⟨hal-01118353⟩
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