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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.|
|Pages:||pp. 3285 - 3287|
|Keywords:||Mid-Infrared,Trace Gas Detection,VIPA spectrometer|
|PDF version:||Click here to retrieve PDF version of paper (552KB)|