Abstract

An experimental investigation was made of the interaction of radiation pulses from a Q-switched neodymium glass laser with water vapor. Pulse-like increase in the transparency of the vapor was observed at the wavelength of probe radiation in the range 185?187 nm; this increase in the transparency increased on increase in the energy of the interacting pulses. The effect was clearly due to two-stage photodissociation of the water vapor molecules in the region of intersection of the interacting and probe radiations.

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