Abstract
Measurements of the temperature distribution and electron density were made in an optical discharge, sustained in atmospheric air by 1.06-μ laser radiation of ~1 MW/cm2 intensity. The plasma temperature within the beam was ~20 kK and the electron density was 2×1017 cm−3. The measured temperature distribution was used to show that about 90% of the energy absorbed by the discharge was carried away by the characteristic plasma radiation, and less than 10% by heat conduction. The method of schlieren photography was used to determine the shape and dimensions of the discharge as a whole, including a region of heated gas surrounding the ionized core. The energy distribution in the various discharge zones was determined.
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