Abstract
AbstractIn the electrical field of a focused beam of a high‐power DC discharge multikilohertz repetition rate Q‐switched CO2 laser a so called pulsed optical discharge (POD) can be sustained. Applying laser pulses with max. 104 pulses/s, 50 mJ/pulse, pulse length 0.2 μs, average power 500 W and peak power 250 kW, the charge carrier density of a hydrogen plasma at a pressure of several MPa produced during the laser pulse is enhanced up to about the cut‐off density at λL = 10.6 μm (≃ 1025 m−3) and the electron temperature is increased to about 105 K. The non‐ideality factor reaches about 0.2. The calibrated line intensity of the Balmer Hβ was monitored by means of an optical multichannel analyzer system with spatial, frequency and time resolution. The measurements yield Stark‐broadened Hβ‐line profiles from which, assuming partial local thermal equilibrium, the electron temperature and density can be derived. The measured asymmetry of the Hβ‐line is in rough agreement with theoretical predictions available in literature.
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