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Laser-induced combustions and explosions generated by high laser irradiances were explored by Laser-Induced Breakdown Spectroscopy (LIBS) in rich, and stoichiometric conditions. The laser used for target ablation is a Q-switched Nd:YAG laser with 7 ns pulse duration at wavelength of 1064 nm laser energies from 40 mJ to 2500 mJ (6.88 x 10 6.53 x 10 W/cm). The plasma light source from aluminum detected by the echelle grating spectrometer and coupled to the gated ICCD(a resolution (/Δ) of 5000). This spectroscopic study has been investigated for obtaining both the atomic signals of aluminum (fuel) – oxygen (oxidizer) and the calculated ambient condition (plasma temperature and electron density). The essence of the paper is observing specific electron density ratio which can support the processes of combustion and explosion between ablated aluminum plume and oxygen from air by inducing high power laser.

The spectroscopic study of chemical reaction of laser-ablated aluminum-oxygen by high power laser