Abstract
Laser heating of small gas volumes containing less than 1016 particles is investigated experimentally. A freely expanding high pressure gas jet is used as a target. Strong absorption of laser light is observed at gas pressures above 20 atm. The time of light-plasma interaction is measured as a function of light power and number of heated particles. Streak photographs of the laser produced plasma indicate a nearly isotropic expansion. The experimental results agree well with the theoretical predictions based on a spherical model.
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