An Investigation of Mechanisms of Initiation of Laser-Supported Absorption (LSA) Waves

Abstract

Additional experimental results of a study of LSD-wave initiation processes are reported. The first measurements of delay time to initiation on nonmetallic materials are presented. In metallic studies, target emission of electrons from aluminum 2024, lead, and tungsten surfaces were recorded at atmospheric pressure prior to LSD-wave initiation. No surface damage was observed on the tungsten surface at 2000X in SEM inspections after irradiation, while lead and aluminum exhibited defect-oriented damage. Time-resolved spectroscopy experiments with aluminum 2024 revealed a dramatic drop in the ionized aluminum vapor emissions above the air pressure threshold for LSD-wave initiation (5-10 torr at 3.2 x 10 to the 8th power watt/cm squared).

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1975
Accession Number
ADA024550

Entities

People

  • C. T. Walters
  • R. E. Beverly Iii
  • R. H. Barnes

Organizations

  • Battelle Memorial Institute

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Pressure
  • Barometric Pressure
  • Charged Particles
  • Electron Emission
  • Electron Energy
  • Electron Microscopes
  • Electron Microscopy
  • Electrons
  • Emission
  • Materials
  • Measurement
  • Peak Power
  • Photoexcitation
  • Production
  • Radiation
  • Spectra
  • Thermionic Emission

Fields of Study

  • Physics

Readers

  • Pulsed Power and Plasma Physics.
  • Thermal Physics or Thermal Science.
  • Thin Film Deposition Science.

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers
  • Microelectronics
  • Microelectronics - Graphene