Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
58 (1985), S. 620-622
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The effect of UV preionization on the optical gas breakdown induced by a CO2 laser pulse is studied experimentally. In the present work a UV spark plug and a pulsed CO2 laser are used as the UV and IR sources, respectively. The experiments are carried out for helium and some other common gases in the pressure range of 10–1000 Torr to determine the breakdown probability. For all of the gases under study the probability appears higher when the gas is UV preionized. These results show the importance of the seed electrons for the IR-induced gas breakdown supporting the theory that the cascade ionization process is dominating in the IR region requiring seed electrons to initiate the process. Oscilloscopic waveforms of the optical breakdown spark fluorescence are also observed which shows the optical breakdown occurs more rapidly when the gas is UV preionized.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.335624
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