Mid-infrared virtually imaged phased array spectrometer for rapid and broadband trace gas detection
Abstract
We present and characterize 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 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 ~600 MHz resolution in a <10 \mu s 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 per second. Changes in absorption above the noise floor of 5\times 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.
- Publication:
-
Optics Letters
- Pub Date:
- August 2012
- DOI:
- 10.1364/OL.37.003285
- arXiv:
- arXiv:1206.1316
- Bibcode:
- 2012OptL...37.3285N
- Keywords:
-
- Physics - Optics
- E-Print:
- doi:10.1364/OL.37.003285