Abstract
Experimental determination in a time-resolved manner of the number densities of free electrons and neutral atoms in a carbon plasma is obtained with two-wavelength interferometry. The plasma is produced by a Q-switched ruby laser with a peak power of 100 MW, and a 3-W argon-ion laser is used as the interferometer light source. A maximum free electron density of 1.6 × 1019 cm−3 and a maximum neutral density of 1.6 × 1020 cm−3 are observed.
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