Cavity-Enhanced Direct Frequency Comb Spectroscopy: Technology and Applications

Adler, Florian; Thorpe, Michael J.; Cossel, Kevin C.; Ye, Jun

doi:10.1146/annurev-anchem-060908-155248

Cited by 219 publications

(174 citation statements)

References 150 publications

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“…If lower resolution and accuracy is sufficient so that one does not need to resolve individual comb lines, one can still exploit the coherence of a comb by coupling it with a resonant cavity for increased sensitivity [8,[32][33][34]. Simplified picture of a dual-comb spectrometer.…”

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

confidence: 99%

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%

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

2010

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“…However, as for supercontinuum lasers, actual o¨-theshelf technology provides mostly combs in the visible or near-infrared spectral regions [3]. But research nowadays with di¨erent sources and methods (di¨er-ence frequency generation (DFG) conversion [2], Fabry Perot frequency comb QCL, microresonators, etc.)…”

Section: Frequency Comb Fourier Spectroscopymentioning

confidence: 99%

Recent progress of laser metrology in chemically reacting flows at onera

Mohamed

Dorval

Vilmart

et al. 2017

Progress in Flight Physics

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This paper presents some of the development actions performed these last years at ONERA using laser spectroscopic techniques to probe chemically reacting §ows. Techniques like laser absorption, laser induced §u-orescence (LIF), and Raman scattering will be described with focus on present drawbacks as well as expectations from new laser technologies (Interband Cascade Lasers (ICL) diodes, Optical Parametrical Oscillators (OPO), frequency comb, and femto/picosecond lasers) before showing some results of recent applications in ground facilities.

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“…For example, individual comb components can be tuned to scan over the frequency gap. [16][17][18][19][20][21] Other methods include spatially separating the comb lines using gratings, 21 Fourier transform spectroscopy of a single OFC 22 and dual-mode spectroscopy using two OFCs. 23,24 Nevertheless, few efforts have been made to decrease the comb spacing to improve the spectral resolution.…”

Section: Introductionmentioning

confidence: 99%

A digitally generated ultrafine optical frequency comb for spectral measurements with 0.01-pm resolution and 0.7-µs response time

Bao

et al. 2015

Light Sci Appl

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Optical spectral measurements are crucial for optical sensors and many other applications, but the prevailing methods, such as optical spectrum analysis and tunable laser spectroscopy, often have to make compromises among resolution, speed, and accuracy. Optical frequency combs are widely used for metrology of discrete atomic and molecular spectral lines. However, they are usually generated by optical methods and have large comb spacing, which limits the resolution for direct sampling of continuous spectra. To overcome these problems, this paper presents an original method to digitally generate an ultrafine optical frequency comb (UFOFC) as the frequency ruler for spectral measurements. Each comb line provides one sampling point, and the full spectrum can be captured at the same time using coherent detection. For an experimental demonstration, we adopted the inverse fast Fourier transform to generate a UFOFC with a comb spacing of 1.46 MHz over a 10-GHz range and demonstrated its functions using a Mach-Zehnder refractive index sensor. The UFOFC obtains a spectral resolution of 0.01 pm and response time of 0.7 ms; both represent 100-fold improvements over the state of the art and could be further enhanced by several orders of magnitude. The UFOFC presented here could facilitate new label-free sensor applications that require both high resolution and fast speed, such as measuring binding kinetics and single-molecule dynamics.

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Cavity-Enhanced Direct Frequency Comb Spectroscopy: Technology and Applications

Cited by 219 publications

References 150 publications

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

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

Recent progress of laser metrology in chemically reacting flows at onera

A digitally generated ultrafine optical frequency comb for spectral measurements with 0.01-pm resolution and 0.7-µs response time

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