VECSEL-based virtually imaged phased array spectrometer for rapid gas phase detection in the mid-infrared

Robert Rockmore, Ricky Gibson, Jerome V. Moloney, R. Jason Jones

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

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 cm1 (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 languageEnglish (US)
Pages (from-to)5796-5799
Number of pages4
JournalOptics letters
Volume45
Issue number20
DOIs
StatePublished - Oct 15 2020

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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