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Investigations of breakdown of rare gases by short pulses of 1.06{mu}m laser radiation

Technical Report:

Abstract

An analysis based on a numerical integration of the equation which governs the total growth rate of the electron density due to the combined effect of multiphoton ionization and electron cascade ionization processes is presented. The calculations are carried out for argon and xenon gases in the pressure range 1.0-5x10{sup 3} Torr illuminated with 10ps pulses of 1.06{mu}m laser radiation. This analysis shows that the two ionization processes (multiphoton and electron cascade) play an important role over the whole pressure regime considered. At low pressures (< 300 Torr) the breakdown is governed solely by the multiphoton process, indicated by the weak dependence of the threshold intensity on the gas pressure. At higher pressures (< 760 Torr) however, a strong pressure dependence of the threshold intensity is observed. This is considered as evidence for the domination of the cascade ionization process at these pressures. On the pressure range 200-760 Torr a slight decrease of the threshold intensity is observed for both gases. This is attributed to the minor role played by the cascade ionization process together with the multiphoton ionization process at these pressures. The calculated thresholds for argon and xenon are consistent with those experimentally measured. (author). 15 refs, 4  More>>
Authors:
Gamal, Y E.E.D.; [1]  Shafik, M S [2] 
  1. International Centre for Theoretical Physics, Trieste (Italy)
  2. United Arab Emirates Univ., Al-Ain (United Arab Emirates). Dept. of Physics
Publication Date:
Aug 01, 1991
Product Type:
Technical Report
Report Number:
LAMP-91/6
Reference Number:
SCA: 664200; PA: AIX-23:015662; SN: 92000647237
Resource Relation:
Other Information: PBD: Aug 1991; Related Information: LAMP series report (Laser, Atomic and Molecular Physics)
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ARGON; BREAKDOWN; LASER RADIATION; PHOTOIONIZATION; XENON; GASES; MULTI-PHOTON PROCESSES; PRESSURE DEPENDENCE; 664200; SPECTRA OF ATOMS AND MOLECULES AND THEIR INTERACTIONS WITH PHOTONS
OSTI ID:
10113421
Research Organizations:
International Centre for Theoretical Physics (ICTP), Trieste (Italy)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ON: DE92615399; TRN: XA9130274015662
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
INIS
Size:
14 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Gamal, Y E.E.D., and Shafik, M S. Investigations of breakdown of rare gases by short pulses of 1.06{mu}m laser radiation. IAEA: N. p., 1991. Web.
Gamal, Y E.E.D., & Shafik, M S. Investigations of breakdown of rare gases by short pulses of 1.06{mu}m laser radiation. IAEA.
Gamal, Y E.E.D., and Shafik, M S. 1991. "Investigations of breakdown of rare gases by short pulses of 1.06{mu}m laser radiation." IAEA.
@misc{etde_10113421,
title = {Investigations of breakdown of rare gases by short pulses of 1.06{mu}m laser radiation}
author = {Gamal, Y E.E.D., and Shafik, M S}
abstractNote = {An analysis based on a numerical integration of the equation which governs the total growth rate of the electron density due to the combined effect of multiphoton ionization and electron cascade ionization processes is presented. The calculations are carried out for argon and xenon gases in the pressure range 1.0-5x10{sup 3} Torr illuminated with 10ps pulses of 1.06{mu}m laser radiation. This analysis shows that the two ionization processes (multiphoton and electron cascade) play an important role over the whole pressure regime considered. At low pressures (< 300 Torr) the breakdown is governed solely by the multiphoton process, indicated by the weak dependence of the threshold intensity on the gas pressure. At higher pressures (< 760 Torr) however, a strong pressure dependence of the threshold intensity is observed. This is considered as evidence for the domination of the cascade ionization process at these pressures. On the pressure range 200-760 Torr a slight decrease of the threshold intensity is observed for both gases. This is attributed to the minor role played by the cascade ionization process together with the multiphoton ionization process at these pressures. The calculated thresholds for argon and xenon are consistent with those experimentally measured. (author). 15 refs, 4 figs.}
place = {IAEA}
year = {1991}
month = {Aug}
}