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Publication Citation: Mid-infrared virtually imaged phased array spectrometer for rapid and broadband trace gas detection

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Author(s): Lora L. Nugent-Glandorf; Tyler W. Neely; Florian B. Adler; Adam J. Fleisher; Kevin C. Cossel; Bryce Bjork; Tim P. Dinneen; Chris S. Wood; Jun Ye; Scott A. Diddams;
Title: Mid-infrared virtually imaged phased array spectrometer for rapid and broadband trace gas detection
Published: August 01, 2012
Abstract: We present and analyze a 2-D imaging spectrometer based on a virtually imaged phased array (VIPA) disperser for rapid, high-resolution molecular detection using mid-infrared (MIR) frequency combs. A broad bandwidth, MIR laser source centered at ~3.1 υm incident on a CH4 sample detects >3750 resolution elements spanning >80 nm with ~600 MHz resolution in a 20 υs acquisition time. In addition to broadband detection, rapid, time-resolved single image detection is demonstrated by capturing dynamic concentration changes of CH4 at a rate of ~375 frames/s. Changes in concentration on this millisecond time scale can be differentiated between subsequent frames with superb signal-to-noise, leading to important future applications, such as real time monitoring of reaction dynamics and gas concentrations.
Citation: Optics Letters
Volume: 37
Issue: 15
Pages: pp. 3285 - 3287
Keywords: Mid-Infrared;Trace Gas Detection;VIPA spectrometer
Research Areas: Physics