On collision-induced amplified emission of alkali atoms

Observation of collision-induced amplified emission in Na-noble gas system

“…We can also see that the Sth value strongly depend on Q2 cross section. The value of S,h for the N a -K r system changes from 8.6 to 0.16 (about 50 times) as Q2 varies from 43 to 68/~2 From [2] we know that the intensity of stimulated Raman scattering emission is not simply proportional to the inverse of population between two excited states 3 2P3/2 and 3 2p~/2, but appears to be much more complex, especialy if we do not work in the large-detuning region.…”

“…From theory [2], the behaviour of the ASE components is virtually determined by the main term, which is proportional to the population difference (P2-Pl). …”

“…The ASE and SRS effects are caused by effective population of the 3 2/91/2 level (Pz) resulting from collisions of the excited sodium atoms with the buffer gas atoms during the laser pulse [2]. The production of ASE on the transition 32p1/2--32S1/2 and SRS with the 32P~/2 -3 2P3/2 transition in a mixture of sodium vapour with helium was first reported in [3] and examined in detail in [4].…”

Review of alkali laser research and development

“…[5][6][7][8][9][10][11][12][13]. Numerous theoretical and experimental studies of energy transfer, energy levels mixing, and a three-level lasing in alkalis were performed during that time, [14][15][16][17][18][19][20][21][22][23][24][25][26][27] but an absence of powerful enough narrowband tunable pump laser sources did not allow efficient lasing in alkali vapors until the beginning of the new millennium. The first really efficient lasing in pulsed and continuous wave (CW) operation in Rb and Cs vapors was observed in 2003 to 2005, 28,29 using a Ti:sapphire laser for optical pumping.…”