Novel Nonlinear Laser Diagnostic Techniques
Annual technical rept. 6 Jun 1991-31 May 1992
SRI INTERNATIONAL MENLO PARK CA MOLECULAR PHYSICS LAB
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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 H2O2 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.
- Lasers and Masers
- Test Facilities, Equipment and Methods