Properties of Inductively Excited Ar+ Ion Lasers in High-Current Regions

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Abstract
Argon gas was filled in wide‐bore tubes of 6 and 10 mm in diameters and excited inductivity with dc pulses of about 10 and 40 μsec durations. For five and two transitions in the 6 and 10 mm bore tubes, respectively, laser pulse waveforms and peak laser intensity vs peak current characteristics have been studied in detail. Laser pulses of the 4880 Å transition were obtained only in 40 μsec pulsed excitation at pressures above 30 mTorr. At a pressure of 15 mTorr, 10 μsec pulsed excitation was more favorable. The peak laser intensity of the 4765 Å transition was saturated but not quenched even at high currents and pressures in the 6 mm bore tube, although those of the other four transitions all were quenched. The phenomena are discussed on the basis of single‐ and multistep excitation processes.