Abstract
Holographic interferometry in the 3 µm wavelength range was developed to measure density profiles in toroidal high-β plasmas. The choice of hydrogen fluoride (HF) laser (2.7 ⋯ 3.1 µm) as a light source meets exactly the requirement of optimal sensitivity of this method within the transparent region of quartz, of which discharge tubes are usually made. Eight strong spectral lines of the HF laser can be used to produce eight superposed holograms on a gelatine detector with almost linear sensitivity by a special method.
The method was first applied to investigate the density distribution in a high-β stellarator plasma. An elliptic deformation of the plasma cross-section was observed.
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Extract of doctoral thesis submitted to Fakultät für Allgemeine Wissenschaften der Technischen Universität München, 1974.
This work was performed under the terms of the agreement on association between the MPI für Plasmaphysik and Euratom.
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Braun, W. Development of multichromatic holographic interferometry in the 3 µm wavelength range (HF-laser) for measuring plasma density profiles. Z Physik B 20, 195–199 (1975). https://doi.org/10.1007/BF01315690
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DOI: https://doi.org/10.1007/BF01315690