Spectroscopic investigation of laser-initiated low-pressure plasmas in atmospheric gases
- 15 May 1983
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 22 (10) , 1573-1577
- https://doi.org/10.1364/ao.22.001573
Abstract
Laser-initiated breakdown of N2, O2, and Ar has been investigated at sub-atmospheric pressures using a pulsed (10-nsec) Nd:yttrium aluminum garnet (Nd:YAG) laser at 1.06 μm. Breakdown thresholds have been determined from 3 to 760 Torr, and spectral analysis of the plasma emission has been carried out at 10 and 125 Torr over the 300–600-nm range. Sharp spectral features arising from highly excited singly and multiply charged ions are reported as well as an underlying continuum at intermediate pressure. Time-resolved measurements indicate a complex kinetic dynamic optical behavior.Keywords
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