22 April 2016 Pulsed discharge production Ar* metastables
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Abstract
The production of relatively high densities of Ar* metastables (>1012 cm-3) in Ar/He mixtures, at total pressures close to 1 atm, is essential for the efficient operation of an optically pumped Ar* laser. We have used emission spectroscopy and diode laser absorption spectroscopy measurements to observe the production and decay of Ar* in a parallel plate pulsed discharge. With discharge pulses of 1 μs duration we find that metastable production is dominated by processes occurring within the first 100 ns of the gas break-down. Application of multiple, closely spaced discharge pulses yields insights concerning conditions that favor metastable production. This information has been combined with time-resolved measurements of voltage and current. The experimental results and preliminary modeling of the discharge kinetics are presented.
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Jiande Han, Michael C. Heaven, Daniel Emmons, Glen P. Perram, David E. Weeks, William F. Bailey, "Pulsed discharge production Ar* metastables", Proc. SPIE 9729, High Energy/Average Power Lasers and Intense Beam Applications IX, 97290D (22 April 2016); doi: 10.1117/12.2218122; https://doi.org/10.1117/12.2218122
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