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

Petko M. Pramatarov; Margarita St. Stefanova; Tadeusz M. Adamowicz; Wojciech Kaminski

doi:10.1117/12.425114

9 April 2001 Influence of the ³He isotope on the output parameters of the noble gas hollow cathode lasers

Petko M. Pramatarov, Margarita St. Stefanova, Tadeusz M. Adamowicz, Wojciech Kaminski

Proceedings Volume 4397, 11th International School on Quantum Electronics: Laser Physics and Applications; (2001) https://doi.org/10.1117/12.425114
Event: 11th International School on Quantum Electronics: Laser Physics and Applications, 2000, Varna, Bulgaria

Abstract

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 ⁴P_5/2 - 5p ⁴D_7/2 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.

Citation Download Citation

Petko M. Pramatarov, Margarita St. Stefanova, Tadeusz M. Adamowicz, and Wojciech Kaminski "Influence of the ³He isotope on the output parameters of the noble gas hollow cathode lasers", Proc. SPIE 4397, 11th International School on Quantum Electronics: Laser Physics and Applications, (9 April 2001); https://doi.org/10.1117/12.425114

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