An ultraviolet laser source and spectral imaging filters for non-intrusive laser-based diagnostics

Details An ultraviolet laser source and spectral imaging filters for non-intrusive laser-based diagnostics An ultraviolet laser source and spectral imaging filters for non-intrusive laser-based diagnostics

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phdt........63f&link_type=abstract

Thesis (PhD). PRINCETON UNIVERSITY, Source DAI-B 58/11, p. 6040, May 1998, 221 pages.

Physics

2

Scientific paper

This dissertation details the development of new state- of-the-art tools which enable ultraviolet non-intrusive laser based diagnostics. A laser source and three new optical filters are developed, characterized, and demonstrated in application to flowfield diagnostics. The laser produces high power (50mJ/pulse), spectrally near transform limited, spatially near diffraction limited, tunable output in the vicinity of 250 nm. A notch absorption band and two narrow passband spectral filters feature exceptional spectral resolution, high throughput, and maintain imaging capabilities. Pairing the laser and filters makes possible unique spatially resolved flowfield measurements via ultraviolet Rayleigh and Raman scattering based techniques. The laser source is an injection-seeded, frequency- tripled, cavity-locked, titanium:sapphire source. It features a new cavity locking scheme, which allows it to be tuned rapidly and discontinuously without losing its narrowband spectral profile. The first spectral filter is a narrow band, notch absorption filter that is based upon a ground state absorption of mercury. The filter acts to strongly suppress a narrow spectral band (on a GHz scale), while efficiently passing light spectrally shifted by a GHz or less. The filter is characterized, modeled, and combined with the laser to demonstrate ultraviolet filtered Rayleigh scattering for flowfield visualization and velocity measurements of a Mach 2 free jet. The second filter is a narrow passband imaging filter, designed for rotational Raman scattering based measurements. It features an ultranarrow passband (less than 1cm-1) and has the ability to suppress strong background scattering (Rayleigh scattering and surface reflections) while maintaining 2-D imaging capabilities. This filter is characterized, modeled, and applied in measurements of individual pure rotational Raman lines of oxygen and nitrogen in room air. The third filter, also for rotational Raman imaging, simultaneously discriminates multiple rotational Raman lines, while maintaining 1-D imaging and suppressing strong out-of-band scattering. The filter is a vapor prism based on the anomalous dispersion of mercury near resonance. The filter is characterized, modeled, and demonstrated capturing rotational Raman scattering signals from CO2.

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