Active Fourier-transform spectroscopy combining the direct RF beating of two fiber-based mode-locked lasers with a novel referencing method

Giaccari, Philippe; Deschênes, Jean-Daniel; Saucier, Philippe; Genest, Jérôme; Tremblay, Pierre

doi:10.1364/oe.16.004347

Cited by 112 publications

(73 citation statements)

References 7 publications

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“…First, such an ideal modelocked laser does not exist, since any real laser will suffer from noise. Therefore the comb must be actively stabilized or monitored [7] to remove noise in both the carrier frequency and repetition rate. Fortunately, in the case of passively modelocked lasers this requires only stabilizing, or monitoring, two degrees of freedom of the comb; the frequencies of all the comb teeth are then known.…”

Section: Overview Of Dual-comb Spectrometry Iia Frequency Combs mentioning

confidence: 99%

“…1, the basic approach of dual comb spectroscopy is to interfere two combs with repetition periods differing slightly by f r . If the two combs are combined before the sample, the system is analogous to traditional FTS [1,2,7] and yields the intensity absorption spectrum only. Alternatively, as is done here and in [3,6,8], the source comb passes through the sample and afterwards be combined with a local oscillator (LO) comb.…”

Section: Iib Coherent Dual-comb Spectroscopymentioning

confidence: 99%

“…In an intermediate approach, the carrier frequency of each comb is phase-locked to a common reference cw laser, and the pulse repetition rates are monitored [40,41]. One can also monitor the carrier frequency of the free-running combs and correct the signal in post processing [7]. This approach removes the main source of drift -the carrier phase -and can provide high frequency accuracy if the reference laser frequency is known.…”

Section: Iie Frequency Comb Stabilizationmentioning

confidence: 99%

“…The use of an optical filter is not absolutely necessary [1,2,7,8] and might at first seem unwanted. On one hand the filter reduces the power on the detector and requires multiple measurements to reconstruct the spectrum.…”

Section: Experimental System Iiia Optical Layoutmentioning

confidence: 99%

“…Over 50 years since its inception, FTS remains relevant and continues to find new applications, in part, because of its continual refinement. The recent advances in spectroscopy using dual frequency combs offers an interesting new approach to FTS [1][2][3][4][5][6][7][8][9]. This dual-comb spectroscopy approach can also be viewed as a form of infrared time-domain spectroscopy (TDS) analogous to THz TDS [10][11][12] , or as a massively parallel multiheterodyne laser spectrometer [13].…”

Section: Introductionmentioning

confidence: 99%

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Coherent dual-comb spectroscopy at high signal-to-noise ratio

2010

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Two coherent frequency combs are used to measure the full complex response of a sample in a configuration analogous to a dispersive Fourier transform spectrometer, infrared time domain spectrometer, or a multiheterodyne laser spectrometer. This dual comb spectrometer retains the frequency accuracy and resolution of the reference underlying the stabilized combs. We discuss the specific design of our coherent dual-comb spectrometer and demonstrate the potential of this technique by measuring the overtone vibration of hydrogen cyanide, centered at 194 THz (1545 nm). We measure the fully normalized, complex response of the gas over a 9 THz bandwidth at 220 MHz frequency resolution yielding 41,000 resolution elements. The average spectral signal-to-noise ratio (SNR) over the 9 THz bandwidth is 2,500 for both the magnitude and phase of the measured spectral response and the peak SNR is 4,000. This peak SNR corresponds to a fractional absorption sensitivity of 0.05% and a phase sensitivity of 250 microradians. As the spectral coverage of combs expands, coherent dual-comb spectroscopy could provide high frequency accuracy and resolution measurements of a complex sample response across a range of spectral regions.Work of U.S. government, not subject to copyright.

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Section: Overview Of Dual-comb Spectrometry Iia Frequency Combs mentioning

confidence: 99%

Section: Iib Coherent Dual-comb Spectroscopymentioning

confidence: 99%

Section: Iie Frequency Comb Stabilizationmentioning

confidence: 99%

Section: Experimental System Iiia Optical Layoutmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Coherent dual-comb spectroscopy at high signal-to-noise ratio

2010

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Encyclopedia of Biophysics

Hänsch

Picqué

2013

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The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. While the advice and information in this book are believed to be true and accurate at the date of publication, neither the authors nor the editors nor the publisher nor EBSA can accept any legal responsibility for any errors or omissions that may be made. The publisher and EBSA make no warranty, express or implied, with respect to the material contained herein.

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