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Updated: Jan 28, 2026

Treating Surfaces with a Cold Atmospheric Pressure Plasma using the COST-Jet
Published on: November 2, 2020
High-sensitive multi-pass imaging interferometry of a gas/plasma jet
G S Sarkisov1, P D McChesney1, S Stein1
1Raytheon, Missile Systems, Directed Energy Division, 1300 Eubank Blvd, Albuquerque, New Mexico 87123, USA.
Abstract:
To increase the sensitivity of optical interferometry for diagnostic of gas/plasma jet density with weak refractivity, we realize several multi-pass probing setups with the visualization field. These optical setups are based on a modified Michelson interferometer with multi-pass and multi-angle propagation of the probing beam through the transparent inhomogeneity. In comparison to the standard single-pass Mach-Zehnder setup, the multi-pass interferometer allows for an increase in the measurement sensitivity of up to 8 times. This technique can be applied to a transparent axially symmetrical gas/plasma jet with low refractivity.
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