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

Author:

Soo Michael1,Glumac Nick2

Affiliation:

1. McGill University, Department of Mechanical Engineering, Montreal, Quebec H3A 0C3, Canada

2. University of Illinois at Urbana-Champaign, Mechanical Science and Engineering Department, Urbana, IL 61801 USA

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.

Publisher

SAGE Publications

Subject

Spectroscopy,Instrumentation

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