Nonlinear Laser Diagnostics for Combustion and Plasma Processes.

Abstract

Significant milestones for quantitative laser-based diagnostics of reacting flows were reached on two separate tasks: (1) the extension of laser-based diagnostics to shorter vacuum ultraviolet (vuv) wavelengths and (2) the development of amplified spontaneous emission (ASE) diagnostics for light atoms. For the first task, phase-matching was applied to produce significant increases in vuv laser intensities, producing over 5 mu J at Lyman alpha (121.6 nm) in a mixture of krypton and argon. Factors affecting the long-term stability of vuv powers were studied. The diagnostic potential of two-photon excited ASE of atomic hydrogen and oxygen was explored in a variety of low-pressure flames. Direct ASE gain measurements gave oxygen concentrations. A model of the ASE signal was developed, and a new understanding of both ASE and laser-induced fluorescence of two-photon excited atoms emerged from this model.

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Document Details

Document Type
Technical Report
Publication Date
Jun 11, 1997
Accession Number
ADA329579

Entities

People

  • David L. Huestis
  • Gregory W. Faris
  • Jay. B. Jeffries

Organizations

  • SRI International

Tags

Communities of Interest

  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Chemistry
  • Combustion
  • Detection
  • Detectors
  • Dye Lasers
  • Electro-Optics
  • Laser Applications
  • Laser Beams
  • Laser Diagnostics
  • Laser Induced Fluorescence
  • Laser Science
  • Lasers
  • Light Sources
  • Measurement
  • Optics
  • Physics Laboratories
  • Refractive Index

Fields of Study

  • Physics

Readers

  • Pulsed Power and Plasma Physics.
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Spectroscopy.

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers