Mid-infrared virtually imaged phased array spectrometer for rapid and broadband trace gas detection.
Lora Nugent-Glandorf, Tyler Neely, Florian Adler, Adam J Fleisher, Kevin C Cossel, Bryce Bjork, Tim Dinneen, Jun Ye, Scott A Diddams
National Institute of Standards and Technology, Time & Frequency Division, Boulder, Colorado 80305, USA. lng@boulder.nist.gov
Optics letters 2012 Aug 1We 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 μm. We demonstrate detection of CH4 at 3.1 μm with >3750 resolution elements spanning >80 nm with ~600 MHz resolution in a <10 μs 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 ~375 frames per second. Changes in absorption above the noise floor of 5×10(-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.
Citation
Lora Nugent-Glandorf, Tyler Neely, Florian Adler, Adam J Fleisher, Kevin C Cossel, Bryce Bjork, Tim Dinneen, Jun Ye, Scott A Diddams. Mid-infrared virtually imaged phased array spectrometer for rapid and broadband trace gas detection. Optics letters. 2012 Aug 1;37(15):3285-7
Mesh Tags
Substances
PMID: 22859160
View Full Text
