Spectrum narrowing and phase conjugation of KrF excimer laser radiation

An electric-discharge KrF laser system with an output energy of 140 mJ in a 20-ns pulse, a beam divergence of 0.1 mrad, and a radiation line width of 0.02 cm^–1 is described. Stimulated Brillouin scattering was studied in gaseous SF₆ at p = 10 atm. The reflection coefficient of the stimulated scattering mirror was 85% and the laser pulse duration was reduced to 1.5 ns. Phase conjugation of the radiation was studied in liquid n-hexane. It was found that the scattered radiation frequency exhibited no Brillouin shift which might be due to the major contribution of stimulated thermal scattering in n-hexane.