Spectroscopic Investigation of Laser-Initiated Low-Pressure Plasmas in Atmospheric Gases.
Physical sciences research papers,
AIR FORCE GEOPHYSICS LAB HANSCOM AFB MA
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Laser-initiated breakdown of N2, 02, and Ar has been investigated st sub-atmospheric pressures using a pulsed 10 ns Ndyttrium aluminum garnet NdYAG laser at 1.06 micrometers. Breakdown thresholds have been determined from 3 to 760 torr and spectral analysis of the plasma emission has been carried out over the range 300-600 nm. 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. Author
- Atmospheric Physics
- Lasers and Masers