Fiber-delivered heterodyne spectroscopy with a mid-infrared frequency comb

Pablo Castro-Marin, Kerr Johnson, Carl Farrell, Ian A. Davidson, Fu Qiang, Gregory T. Jasion, Natalie V. Wheeler, Francesco Poletti, David J. Richardson, Derryck T. Reid*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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By exploiting the excellent short-term phase stability between consecutive pulses from a free-running optical parametric oscillator frequency comb, we report the first example of hollow-core fiber-delivered heterodyne spectroscopy in the 3.1–3.8 µm wavelength range. The technique provides a means of spectroscopically interrogating a sample situated at the distal end of a fiber, with all electronics and light sources situated at the proximal end and with an inherent capability to suppress spectroscopically interfering features present in the free-space and in-fiber delivery path. Using a silica anti-resonant, hollow-core delivery fiber, we demonstrate high quality transmission and attenuated total reflectance spectroscopy of a plastic sample for fiber lengths of up to 40 m, significantly exceeding the few-meter lengths typically possible using solid-core fibers. The technique opens a route to implementing multi-species spectroscopic monitoring in remote and / or hostile industrial environments and medical applications.

Original languageEnglish
Pages (from-to)34064-34073
Number of pages10
JournalOptics Express
Issue number21
Early online date26 Sept 2023
Publication statusPublished - 9 Oct 2023

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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