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Published December 2017 | Published
Journal Article Open

Spatially translatable optical fiber-coupled heterodyne interferometer


An interferometer is a useful diagnostic tool for measuring line-averaged electron density but is limited in its use because it generally measures at a fixed location. We report here a spatially translatable fiber-coupled interferometer that measures the density of a high-speed MHD-driven plasma jet colliding with a target cloud. The interferometer uses a He–Ne laser coupled to a polarization-maintaining single mode optical fiber having a vacuum feedthrough. The interferometer provides a measure of the spatial-temporal profile of the line-averaged electron density from which the change in jet velocity as a result of its collision with the target cloud can be deduced.

Additional Information

© 2017 Published by AIP Publishing. Received 29 September 2017; accepted 20 November 2017; published online 13 December 2017. Supported by USDOE ARPA-E Grant No. DE-AR0000565.

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August 21, 2023
August 21, 2023