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We report consistent ignition of high-pressure (p > 20-30 bar)hydrogen-oxygen mixtures diluted with helium, using an unfocused Nd:YAG laser.This corresponds to laser irradiances several orders of magnitude below theminimum ignition energies reported in the literature. By placing a mirrorinside a cylindrical vessel and filling it up to 100 bar with H2-He or O2-Henon-combustible mixtures, we obtain the pressure-dependent absorptivity of thecombustible He-H2-O2 mixture. We find no measurable absorption of the lasersignal by the medium, for the overall pressure range, to the experimentalapparatus sensitivity (about 1% of the laser irradiance). This leads credenceto the theory that ignition stems from seed electrons created by autofocusingionization of dust/impurities in the gas.

Unfocused laser ignition of high-pressure He-H2-O2 combustible mixtures