Massively Parallel Sensing Of Trace Molecules And Their Isotopologues With Broadband Mid-Ir Frequency Combs Produced Via Optical Subharmonic Generation

Keywords

Femtosecond; Frequency combs; Molecular spectroscopy; Optical parametric oscillators.

Abstract

We present a new platform for mid-infrared (MIR) dual-comb spectroscopy, based on a pair of ultra-broadband subharmonic optical parametric oscillators (OPOs) pumped by two phase-locked thulium-fiber combs. Our system provides fast (7 ms for a single interferogram), moving-parts-free, simultaneous acquisition of 350,000 spectral data points, spaced by 115-MHz intermodal interval over 3.1-5.5 μm spectral range. Parallel detection of 22 trace molecular species in a gas mixture, including isotopologues containing such isotopes as 13C, 18O, 17O, 15N, 34S, 33S and 2H (deuterium), with part-per-billion sensitivity and sub-Doppler resolution has been demonstrated. We also show that by utilizing Kerr-lens mode-locked Cr:ZnS lasers operating at λ2.35 μm one can create MIR frequency combs spanning almost two octaves in wavelength.

Publication Date

1-1-2018

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

10639

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.2303920

Socpus ID

85049192494 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85049192494

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