Abstract
The effects of ambient gas pressure on the propagation dynamics of laterally colliding laser-produced aluminum plasma is investigated under various ambient conditions. In lower pressure range the interaction zone formed in between the seed plasmas exist for a short span of time. A strong stagnation region is observed at 10−2 mbar pressure in Ar ambient. Interaction zones are formed due to the shock waves generated at the seed plasmas at pressures above 0.1 mbar. A peculiar type of plume splitting is also observed at 0.15 mbar in air ambient at 150 ns. In Ar ambient, a channel like structure is observed in between the plasma plumes whose width increased with time. Shock interaction in air ambient is explained by regular reflection of shock waves where an illuminated interaction zone was formed where as in heavier Ar ambient, Mach reflection of shock waves occurs.
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