Time-resolved plasma diagnostic by laser-diode spectroscopy

A tunable diode laser has been used as a light source for line-of-sight absorption and Doppler-shift measurements. We have applied the method to perform plasma diagnostics in a magneto plasma dynamic (MPD) pulsed propulsor device and of an Ar/sup +/ laser tube plasma. Spectrally resolved argon absor...

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Bibliographic Details
Published in:IEEE journal of quantum electronics 1996-11, Vol.32 (11), p.1874-1881
Main Authors: Beverini, N., Del Gobbo, G., Genovesi, G.L., Maccarrone, F., Strumia, F., Paganucci, F., Turco, A., Andrenucci, M.
Format: Article
Language:English
Subjects:
Absorption
Argon
Biological and medical applications
Diode lasers
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Laser spectroscopy
Laser transitions
Laser tuning
Optical (ultraviolet, visible, infrared) measurements
Optics
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
Plasma devices
Plasma diagnostic techniques and instrumentation
Plasma diagnostics
Plasma measurements
Plasma sources
Spectroscopy
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Summary:A tunable diode laser has been used as a light source for line-of-sight absorption and Doppler-shift measurements. We have applied the method to perform plasma diagnostics in a magneto plasma dynamic (MPD) pulsed propulsor device and of an Ar/sup +/ laser tube plasma. Spectrally resolved argon absorption lineshapes of transitions of neutral and single ionized argon were recorded. A high temporal resolution (a few microseconds) is achieved by fast tuning the laser frequency at a repetition rate greater than 100 kHz. From the recorded spectra, we deduce the dynamics of the neutral components of the plasma in the thruster. We also demonstrate the possibility of direct ion diagnostics by the observation of ionic transitions, using red diode lasers in an Ar/sup +/-laser commercial tube.
ISSN:0018-9197
1558-1713
DOI:10.1109/3.541673