Gas breakdown by a short laser pulse

Autor: C Grey Morgan, C L M Ireland
Rok vydání: 1973
Předmět:
Zdroj: Journal of Physics D: Applied Physics. 6:720-729
ISSN: 0022-3727
DOI: 10.1088/0022-3727/6/6/314
Popis: The breakdown of gases by short (typically sub-nanosecond) laser pulses when the two dominant mechanisms governing the plasma growth are multiphoton and cascade ionization is treated theoretically. It is shown that two important pressure r?gimes result: a low-pressure r?gime where the breakdown is governed solely by the multiphoton ionization process; and a high-pressure r?gime where the expression for threshold breakdown intensity involves both ionization processes as well as the effect of impurities in the gas. The predictions of the theory are compared with published experimental data for ruby and Nd3+ laser pulses. Good agreement is obtained in the case of ruby radiation, and a possible explanation of deviation from the experimental data obtained using a Nd3+ laser is offered.
Databáze: OpenAIRE