Ultraviolet Absorption Spectroscopy in Optically Dense Fireballs Using Broadband Second-Harmonic Generation of a Pulsed Modeless Dye Laser

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Abstract:

Broadband frequency doubling of a modeless dye laser pulse is used to enable single-shot absorption spectroscopy in the ultraviolet for optically dense, energetic-materials fireball applications. Band widths of approximately 1‐3 nm are generated in the 226 and 268 nm regions using a doubling crystal. Strong focusing of the fundamental beam onto the crystal is found to be sufficient to achieve 1‐5% conversion efficiency with a pulse intensity sufficient to saturate the array detector even after 75% attenuation through the fireball. The technique is demonstrated with nitric oxide (NO) absorption in a gas cell and is then used to perform the first detection and temperature fitting of aluminum monofluoride (AlF) and magnesium monofluoride (MgF) in a fireball environment.

Keywords: Absorption; Combustion; Fireball; Metal-fluorocarbon; Modeless laser; UV spectroscopy; Ultraviolet spectroscopy

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/13-07276

Affiliations: McGill University, Department of Mechanical Engineering, Montreal, Quebec H3A 0C3, Canada

Publication date: May 1, 2014

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