CO2-Laser Interferometer for the Measurement of Transient Low-Density Plasmas
- 1 January 1969
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 40 (1) , 145-147
- https://doi.org/10.1063/1.1683708
Abstract
A coupled cavity CO2‐laser interferometer is described. The feedback is achieved either with (a) a rotating corner mirror or (b) an oscillating mirror. For method (a) a sensitivity of ∫ndl≥5×10 14 cm −2 and time resolution of 0.2 μsec is obtained. Method (b) is more sensitive (∫ndl≥10 13 cm −2 ) but the time resolution is limited by the fact that signal amplitudes are strongly frequency dependent above 350 kc. The interferometer has been used to measureplasma densities of the Scylla IA θ pinch.Keywords
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