VECSEL-based virtually imaged phased array spectrometer for rapid gas phase detection in the mid-infrared
Abstract
We present a novel, to the best of our knowledge, system for high-resolution, time-resolved spectroscopy in the mid-wave infrared based on a modelocked vertical external cavity surface emitting laser (VECSEL) frequency comb coupled to a virtually imaged phased array (VIPA) spectrometer. The GHz level repetition rate of VECSEL-based systems coupled to VIPA spectrometers enables comb tooth resolved spectra without the use of additional filter cavities often required to increase comb tooth spacing. We demonstrate absorption spectroscopy on a methane ( C H 4 ) gas mixture at 2900 c m − 1 (3.4 µm) with over 35 c m − 1 spectral bandwidth in a single image. Rapid time-resolved measurements were made using a 300 µs exposure time with an acquisition rate limited to 125 Hz by the available camera. High-resolution absolute frequency measurements were performed by scanning the repetition rate of the VECSEL frequency comb.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 13, 2020
- Source ID
- 10.1364/ol.405192
Entities
People
- Jerome V. Moloney
- R. Jason Jones
- Ricky Gibson
- Robert Rockmore
Organizations
- Air Force Office of Scientific Research