A 337‐μ HCN laser interferometer for plasma diagnostics

Autor:	L. B. Whitbourn, G. D. Tait, N. R. Heckenberg
Rok vydání:	1973
Předmět:	Electron density Frequency response Chemistry business.industry Astrophysics::Instrumentation and Methods for Astrophysics General Physics and Astronomy Plasma Laser law.invention Interferometry Amplitude Optics Path length law Plasma diagnostics business
Zdroj:	Journal of Applied Physics. 44:4522-4533
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.1661993
Popis:	A self‐modulating laser interferometer incorporating a 337‐μ HCN laser is described and a simple theory of its operation is developed. This theory shows that the long lifetimes of levels involved in molecular laser transitions may cause a peaked frequency response in such an instrument. Experimental observations indicate a flat frequency response up to the maximum attained fringing rate of 10 kHz. The interferometer was used to make electron density measurements in the range 2 × 1012 cm−3−1014 cm−3 for an effective path length of 150 cm in a decaying helium plasma. The interferograms obtained show a marked time variation in fringe amplitude which is attributed to the refractive effects of electron density gradients in the plasma.
Databáze:	OpenAIRE
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