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Noise-immune cavity-enhanced optical frequency comb spectroscopy: a sensitive technique for high-resolution broadband molecular detection
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0002-6191-7926
2015 (English)In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 119, no 1, 87-96 p.Article in journal (Refereed) PublishedText
Abstract [en]

Noise-immune cavity-enhanced optical frequency comb spectroscopy (NICE-OFCS) is a recently developed technique that utilizes phase modulation to obtain immunity to frequency-to-amplitude noise conversion by the cavity modes and yields high absorption sensitivity over a broad spectral range. We describe the principles of the technique and discuss possible comb-cavity matching solutions. We present a theoretical description of NICE-OFCS signals detected with a Fourier transform spectrometer (FTS) and validate the model by comparing it to experimental CO2 spectra around 1,575 nm. Our system is based on an Er:fiber femtosecond laser locked to a cavity and phase-modulated at a frequency equal to a multiple of the cavity free spectral range (FSR). The NICE-OFCS signal is detected by a fast-scanning FTS equipped with a high-bandwidth commercial detector. We demonstrate a simple method of passive locking of the modulation frequency to the cavity FSR that significantly improves the long-term stability of the system, allowing averaging times on the order of minutes. Using a cavity with a finesse of ~9,000, we obtain absorption sensitivity of 6.4 × 10−11 cm−1 Hz−1∕2 per spectral element and concentration detection limit for CO2 of 450 ppb Hz−1/2, determined by multiline fitting.

Place, publisher, year, edition, pages
Springer Berlin/Heidelberg, 2015. Vol. 119, no 1, 87-96 p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-114664DOI: 10.1007/s00340-015-6010-7ISI: 000352292500011OAI: oai:DiVA.org:umu-114664DiVA: diva2:897424
Funder
Carl Tryggers foundation , CTS12:131Swedish Research Council, 621-2012-3650Swedish Foundation for Strategic Research , ICA12-0031
Note

Special Issue.

This project was supported by the Swedish Research Council (621-2012-3650), Swedish Foundation for Strategic Research (ICA12-0031), the Carl Trygger’s Foundation (CTS12:131), and the Faculty of Science and Technology, Umeå University.

Available from: 2016-01-25 Created: 2016-01-25 Last updated: 2016-03-21Bibliographically approved

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Khodabakhsh, AmirJohansson, Alexandra C.Foltynowicz, Aleksandra
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Applied physics. B, Lasers and optics (Print)
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