Novel Nonlinear Laser Diagnostic Techniques
Abstract
Research on novel laser-based diagnostic techniques was performed in two areas: (1) extension of laser-based diagnostics to shorter wavelengths for two-phonon detection of atomic ions and for other detection techniques requiring high powers in the vuv and (2) investigation of the feasibility of quantitative concentration, temperature, and velocity measurements using two-phonon-excited amplified spontaneous emission of atomic oxygen and hydrogen. For the first task, the two-photon-resonant difference-frequency mixing process was extended to higher powers and shorter wavelengths. This radiation was used to perform multiphoton spectroscopy at shorter wavelengths in the vuv, including two- phonon-excited fluorescence in neon at 133 nm. On the second task, laser-induced fluorescence measurements of atomic hydrogen in a variety of low-pressure flames were compared with simultaneous ASE observations. The bandwidth of H atom ASE at 1200 and 1800 K was measured. Simultaneous O atom ASE and LIF in an H2/O2 low- pressure flame have been demonstrated, and a model to calculate the intensity variation for laser gain measurements on a diode probe laser for atomic oxygen was assembled.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 10, 1992
- Accession Number
- ADA254709
Entities
People
- David L. Huestis
- Gregory W. Faris
- Jay. B. Jeffries
Organizations
- SRI International