Abstract
In this study, a propagation model of a LSD wave was proposed and validated using the measured propagation velocity. The model describes the expansion mechanism in terms of ionization kinetics through laser-absorption process and photo-ionization by radiation from bulk plasma behind the wave. Optical emission-spectroscopy (OES) and two-wavelength Mach-Zehnder (TWMZ) interferometry were used to measure the electron temperature and the electron density. As a result, the electron temperature and density were estimated as 3 eV and 10 m, respectively at 10.6 μm laser wavelength when the laser intensity was near the laser-supported detonation threshold in the air atmosphere. Using the measured plasma properties, UV photon flux radiated by bremsstrahlung was estimated. The resulting propagation velocity of the laser-absorption wave was 10 m/s. It showed good agreement with the velocity measured using an ICCD.
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