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Rev Sci Instrum
; 90(2): 023504, 2019 Feb.
Article
in English
| MEDLINE
| ID: mdl-30831685
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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