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Influence of the 3He isotope on the output parameters of the noble gas hollow cathode lasers

The influence of the 3He isotope as a buffer gas on the operating characteristics of the He-Ne and He-Kr hollow cathode lasers is studied. A comparison of the laser output power on the NeI 1.15 micrometer line (2s2 - 2p4 transition) and KrII 469.4 nm line (6s 4P5/2 - 5p 4D7/2 transition) in 3He-noble gas and 4He- noble gas mixtures is made. An increase of 4 times in the case of 3He-Ne gas mixture and of 33% in the case 3He-Kr gas mixture is observed. The plasma kinetics is analyzed and it is shown that the observed increase of the laser parameters is due to the following changes in particle kinetics: (1) increased rate constant for the excitation transfer reaction; (2) increased density of the He (2 3S1) metastable atoms; (3) decreased population rate of the NeI lower laser level 2p4; (4) decreased density of the Ne (1s3, 1s5) metastable atoms and (5) increased density of the Kr ground state ions. The main reasons for that are the higher mean relative velocity of the colliding particles and the higher rate of electron cooling in 3He-noble gas plasma. Peak powers of 10 W and 1.5 W and small signal gains of 85%/m and 64%/m are measured for the blue and violet KrII lines, respectively, from 21 cm active length.