Stimulated IR emission in an optically pumped cesium vapour

Generation of stimulated IR radiation in Cs vapor under optical pumping

“…Moreover, a sharp increase in efficiency of stimulated JR radiation on the 62P312-52D5 transition(3,49 .tm) was achieved under resonance conditions 62P3 -fl2Sjt and 62P3j -m2D512, whereas similar phenomenon for IR-line 3,01 pm ( 62P112-52D3,) is observed by coincidence of w,. Note that 'JR sharply increases when L S tuned in the vicinity ofresonances with frequencies of atomic transitions from the first excited 6P state to situated higher S or D levels.…”

“…As a result, the molecules are excited to upper electronic states that leads to either direct formation of inverse population with respect lower lying electron-vibrational levels, which is accompanied by generation in visible or near IR spectrum region, or results in the decay of excited molecules into atoms , one of which is also excited, and inverse population occurs between two upper atomic levels in this case [1,3]. As a result, the molecules are excited to upper electronic states that leads to either direct formation of inverse population with respect lower lying electron-vibrational levels, which is accompanied by generation in visible or near IR spectrum region, or results in the decay of excited molecules into atoms , one of which is also excited, and inverse population occurs between two upper atomic levels in this case [1,3].…”

“…Rather recently one more mechanism of inverse population for the upper levels of alkaline-metal atoms under the conditions that pumping frequency is tunabled in the vicinities of isolated resonance with transitions between the first excited P and situated higher S or D stated was suggested [2,3].…”

“…Simular to [3], cascade radiation emission, starting with the level resonant to the frequency 0L ofthe pump laser should arise under these conditions. The latter quantity reaches its maximum for nJ2itc= l7OOOcm .…”