Background-free broadband absorption spectroscopy based on interferometric suppression with a sign-inverted waveform

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http://hdl.handle.net/10138/300268

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Tomberg , T , Muraviev , A , Ru , Q & Vodopyanov , K L 2019 , ' Background-free broadband absorption spectroscopy based on interferometric suppression with a sign-inverted waveform ' , Optica , vol. 6 , no. 2 , pp. 147-151 . https://doi.org/10.1364/OPTICA.6.000147

Title: Background-free broadband absorption spectroscopy based on interferometric suppression with a sign-inverted waveform
Author: Tomberg, Teemu; Muraviev, Andrey; Ru, Qitian; Vodopyanov, Konstantin L.
Contributor: University of Helsinki, Department of Chemistry
Date: 2019-02-20
Language: eng
Number of pages: 5
Belongs to series: Optica
ISSN: 2334-2536
URI: http://hdl.handle.net/10138/300268
Abstract: Background-free methods have potentially superior detection sensitivity because of their ability to take advantage of the full laser power; they are therefore attractive to spectroscopists. We implement background-free Fourier transform spectroscopy based on coherent suppression of the background using an interferometer, whereby the central peak of the interferogram is suppressed without losing molecular absorption signatures. This results in the appearance of peaks rather than dips in the measured spectrum. The technique can be used with a variety of broadband spectroscopies and features advantages such as a reduction in the required detector dynamic range, the capability to perform quantitative measurements, and strongly enhanced sensitivity down to the quantum limit. We validated our method experimentally by performing mid-infrared dual-comb spectroscopy with a mixture of multiple molecular species over a broad wavelength range of 3-5 mu m. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Subject: NITRIC-OXIDE
LASER
114 Physical sciences
116 Chemical sciences
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