Online gas monitoring using a mid-infrared OPO based dual comb spectrometer

Harren, Frans

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https://hdl.handle.net/2142/100507 Copy

Description

Title

Online gas monitoring using a mid-infrared OPO based dual comb spectrometer

Author(s)

Harren, Frans

Issue Date

2018-06-20

Keyword(s)

Mini-symposium: Frequency-Comb Spectroscopy

Abstract

A dual-frequency comb-based spectrometer for the mid-infrared (3-5 micrometer) wavelength region will open many opportunities for spectroscopic applications. Non-linear conversion provides a wide spectral coverage in the mid-infrared using Optical Parametric Oscillators, keeping the optical properties of the well-established near infrared frequency combs with good frequency accuracy, high spectral resolution at seconds time scale. A number of challenges remain when OPOs are used for optical conversion, because the OPO cavity generate frequency and intensity fluctuation in the combs. Here, we present how these variations are measured and used, in real-time, to correct the recorded broadband spectrum. By monitoring the frequency and amplitude variations of a single absorption line in a reference gas cell, each individual spectrum is normalized in amplitude and corrected by an offset-frequency. As such, real-time averaging is achieved over minutes with minor losses in spectral resolution or degradation, leading to an improvement in spectral resolution. A high-to-noise ratio of about 2400 is achieved with such spectral resolution, demonstrating the efficiency of the proposed method.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100507

DOI

10.15278/isms.2018.WG10

Copyright and License Information

Copyright 2018 Frans Harren

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