Laser action on infrared chlorine and oxygen atomic transitions using uranium fission fragment pumping

摘要

Quasi-cw laser action with pulse duration up to 10 ms on the 1.59-, 2.45-$mu@m atomic Cl transitions and 2.65-, 2.76-$mu@m atomic O transitions was observed under uranium fission fragment pumping of atmospheric-pressure gas media. The mixtures of He, Ne, Ar with CCl$-4$/, CHCl$-3$/, CF$-2$/Cl$-2$/, C$-2$/F$-3$/Cl$-3$/, O$-2$/, NO, or CO were used. Nuclear pumping of high-pressure gas media at the 2.45- and 2.65-$mu@m lines has been achieved for the first time. To our knowledge, the 2.76-$mu@m line is a new laser line. The maximum energy parameters (output power of 130 W, power efficiency of about 0.2%) were measured for the 1.59-$mu@m chlorine line in He/Ne/CCl$-4$/ (25000/25000/1) mixture at 2 atm pressure. The minimum laser threshold was observed for this line at the thermal neutron flux of 2 $MUL 10$+13$/ n/cm$+2$/s.