LSD Termination Conditions and Post-Shock Electron Density

Description

Electron number density behind a laser supported detonation (LSD) wave was measured by the two-wavelength Mach Zehnder interferometry. As a result, the density was maintained at about 2×10[/m] during the LSD regime in 2D and quasi-1D blast wave expansion conditions. It suggests that this is a critical density necessary to sustain LSD in atmospheric air by CO2 lasers. Temperature was estimated at 12000~15000 K assuming local thermal equilibrium. Deduced absorption length was at 0.10~0.13 mm. It suggests that the laser was absorbed in a very thin region of the plasma layer.

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