Accession Number:
ADA329579
Title:
Nonlinear Laser Diagnostics for Combustion and Plasma Processes.
Descriptive Note:
Final rept. 15 Apr 94-14 Apr 97,
Corporate Author:
SRI INTERNATIONAL MENLO PARK CA
Personal Author(s):
Report Date:
1997-06-11
Pagination or Media Count:
37.0
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.
Descriptors:
- *PLASMAS(PHYSICS)
- *LASER APPLICATIONS
- *VACUUM ULTRAVIOLET RADIATION
- *PLASMA DIAGNOSTICS
- EMISSION
- MEASUREMENT
- LASER INDUCED FLUORESCENCE
- INTENSITY
- LOW PRESSURE
- ATOMS
- LONG RANGE(TIME)
- HYDROGEN
- MIXTURES
- OXYGEN
- COMBUSTION
- NONLINEAR SYSTEMS
- GAIN
- DIAGNOSIS(GENERAL)
- PHOTONS
- FLAMES
- AMPLIFICATION
- ARGON
- CONCENTRATION(CHEMISTRY)
- ATOMIC STRUCTURE
- KRYPTON
Subject Categories:
- Lasers and Masers
- Plasma Physics and Magnetohydrodynamics