Massively parallel detection of trace molecules and isotopologues with a subharmonic mid-IR dual comb system

Vodopyanov, Konstantin L

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https://hdl.handle.net/2142/100850 Copy

Description

Title

Massively parallel detection of trace molecules and isotopologues with a subharmonic mid-IR dual comb system

Author(s)

Vodopyanov, Konstantin L

Contributor(s)

• Loparo, Zachary E
• Smolski, Viktor O
• Muraviev, Andrey

Issue Date

2018-06-19

Keyword(s)

Mini-symposium: Frequency-Comb Spectroscopy

Abstract

We use a pair of highly-coherent subharmonic GaAs optical parametric oscillators with an instantaneous span 3.1-5.5 µm to demonstrate fast acquisition of 350,000 mode-resolved spectral data points and perform parallel detection in a mixture of 22 molecular species including N2O, NO, CO, OCS, CH4, C2H6, C2H4, C2H2, CO2, H2O, and their isotopologues containing 33S, 34S, 13C, 15N, 18O, 17O, and 2H (deuterium) isotopes. We demonstrate all the benefits of the mid-IR dual-comb spectroscopy including broadband coverage, fast acquisition of massive spectral data, ppb-level sensitivity, comb-tooth resolved spectra (with finesse 4000) and absolute optical frequency referencing to atomic clock. We sampled molecular spectra with the combtooth spacing (115 MHz), however, thanks to the narrow comb teeth (3-kHz absolute and 25-mHz relative linewidth between the two combs), much higher spectral resolution can be obtained in the scanning comb-tooth resolved mode. The Figure shows: (a) schematic of the dual-comb setup, (b) log-scale optical spectrum retrieved from a single coherently-averaged interferogram with an evacuated multipass gas cell, and (c) when the cell was filled with a mixture of gases. The two spectra are vertically offset for clarity.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100850

DOI

10.15278/isms.2018.TA03

Copyright and License Information

Copyright 2018 Konstantin L. Vodopyanov

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