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 (CH4) gas mixture at 2900 cm−1 (3.4 µm) with over 35 cm−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.
Original language | English (US) |
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Pages (from-to) | 5796-5799 |
Number of pages | 4 |
Journal | Optics letters |
Volume | 45 |
Issue number | 20 |
DOIs | |
State | Published - Oct 15 2020 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics