4.6 Article

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

Journal

OPTICS LETTERS
Volume 37, Issue 15, Pages 3285-3287

Publisher

OPTICAL SOC AMER
DOI: 10.1364/OL.37.003285

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Funding

  1. National Institute of Standards and Technology (NIST)
  2. National Science Foundation (NSF)
  3. National Research Council (NRC)

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We present and characterize a two-dimensional (2D) imaging spectrometer based on a virtually imaged phased array (VIPA) disperser for rapid, high-resolution molecular detection using mid-infrared (MIR) frequency combs at 3.1 and 3.8 mu m. We demonstrate detection of CH4 at 3.1 mu m with >3750 resolution elements spanning >80 nm with similar to 600 MHz resolution in a <10 mu s acquisition time. In addition to broadband detection, we also demonstrate rapid, time-resolved single-image detection by capturing dynamic concentration changes of CH4 at a rate of similar to 375 frames per second. Changes in absorption above the noise floor of 5 x 10(-4) are readily detected on the millisecond time scale, leading to important future applications such as real-time monitoring of trace gas concentrations and detection of reactive intermediates. (C) 2012 Optical Society of America

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