The development of a tunable, single-frequency ultraviolet laser source for UV Filtered Rayleigh Scattering
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We present the development of a flexible, high power, narrow line width, tunable ultravioler source for diagnostic application. By frequency tripling lhe output of a pulsed titanium-sapphire laser, we achieve broadly tunable (227-360 nm) ultraviolet light with high quality spatial and spectral resolution. We also present the characterization of a mercury vapor cell which provides a narrow band, sharp edge absorption filter at 253.7 nm. These two components form the basis for the extension of the Filtered Rayleigh Scattering technique into the ultraviolet. The UV-FRS system is comprised of four pieces: a single frequency, cw tunable Ti: Sapphire seeding source; a high-powered pulsed Ti: Sapphire oscillator; a third harmonic generation system; and an atomic mercury vapor filter. In this paper we discuss the development and characterization of each of these elements.