High-order stimulated Raman emission and two-photon stimulated emission byphotodissociation of PbI2 molecules

When focusing YAG laser pulses at 266 nm into a heat-pipe oven containing P bI2 molecules vapor, four red line emissions at 626.0, 619.8, 613.7 and 621 .8 nm are observed. The photodissociation mechanism of PbI2 molecules and t he possible generation channels of these four line emissions are: given. Mo reover, the dependence of the emission at 626.0 nm on incident laser energy and heat-pipe temperature is measured. The experimental observation is wel l supported by the photodissociation mechanism proposed by us.