Quantum-noise-limited cavity ring-down spectroscopy

Long, David A.; Fleisher, Adam J.; Wójtewicz, Szymon; Hodges, Joseph T.

doi:10.1007/s00340-014-5808-z

Cited by 33 publications

(15 citation statements)

References 20 publications

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“…1(a). A continuous-wave (CW) external cavity diode laser (ECDL), tunable from 1570 nm to 1630 nm [27,28], was coupled to an erbium-doped fiber amplifier (EDFA, 180 mW optical power) prior to seeding the EOMs for comb generation and cavity-comb coupling. The probe and LO combs were created using phase modulators of nominally 20 GHz 3-dB RF bandwidth and were driven by separate steprecovery diodes used to imprint RF harmonics upon the CW optical carrier in each arm.…”

Section: Methodology Of Comb Generationmentioning

confidence: 99%

Coherent cavity-enhanced dual-comb spectroscopy

Fleisher¹,

Long²,

Reed³

et al. 2016

Opt. Express

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Dual-comb spectroscopy allows for the rapid, multiplexed acquisition of high-resolution spectra without the need for moving parts or low-resolution dispersive optics. This method of broadband spectroscopy is most often accomplished via tight phase locking of two mode-locked lasers or via sophisticated signal processing algorithms, and therefore, long integration times of phase coherent signals are difficult to achieve. Here we demonstrate an alternative approach to dual-comb spectroscopy using two phase modulator combs originating from a single continuous-wave laser capable of > 2 hours of coherent real-time averaging. The dual combs were generated by driving the phase modulators with step-recovery diodes where each comb consisted of > 250 teeth with 203 MHz spacing and spanned > 50 GHz region in the near-infrared. The step-recovery diodes are passive devices that provide low-phase-noise harmonics for efficient coupling into an enhancement cavity at picowatt optical powers. With this approach, we demonstrate the sensitivity to simultaneously monitor ambient levels of CO2, CO, HDO, and H2O in a single spectral region at a maximum acquisition rate of 150 kHz. Robust, compact, low-cost and widely tunable dual-comb systems could enable a network of distributed multiplexed optical sensors.

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Section: Methodology Of Comb Generationmentioning

confidence: 99%

Coherent cavity-enhanced dual-comb spectroscopy

Fleisher¹,

Long²,

Reed³

et al. 2016

Opt. Express

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“…Spectra can then be recorded simply by stepping the EOM drive frequency in increments of the cavity's free spectral range. We have demonstrated scanning rates which are limited only by the cavity's response time and a noise-equivalent absorption coefficient (NEA) as low as 6 Â 10 À 14 cm À 1 Hz À 1/2 [5,11].…”

Section: Experimental Approachmentioning

confidence: 98%

“…This sample contained 425.4 (11) 3. The pressure measurements were made with a NIST-calibrated capacitance diaphragm gauge with a full-scale response of 133.3 kPa and a relative standard uncertainty less than 0.1%.…”

Section: Experimental Approachmentioning

confidence: 99%

Frequency-agile, rapid scanning cavity ring-down spectroscopy (FARS-CRDS) measurements of the (30012)←(00001) near-infrared carbon dioxide band

Long

Wójtewicz

Miller

et al. 2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…As a result, very low noise photodetectors are required to achieve high signal-to-noise ratios on the ring-down decay events. In addition, high efficiency electro-optic modulators are not available in the mid-infrared, which can make Pound-Drever-Hall locking [11] far more challenging [12] as well as precluding the use of recently developed frequency-agile techniques [6, 7, 13]. …”

mentioning

confidence: 99%

Ultra-sensitive cavity ring-down spectroscopy in the mid-infrared spectral region

et al. 2016

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We describe an ultra-sensitive cavity ring-down spectrometer which operates in the mid-infrared spectral region near 4.5 µm. With this instrument a noise-equivalent absorption coefficient of 2.6×10−11 cm−1 Hz−1/2 was demonstrated with less than 150 nW of optical power incident on the photodetector. Quantum noise was observed in the individual ring-down decay events, leading to quantum-noise-limited short-time performance. We believe that this spectrometer’s combination of high sensitivity and robustness make it well suited for measurements of ultra-trace gas species as well as applications in optics and fundamental physics.

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Quantum-noise-limited cavity ring-down spectroscopy

Cited by 33 publications

References 20 publications

Coherent cavity-enhanced dual-comb spectroscopy

Coherent cavity-enhanced dual-comb spectroscopy

Frequency-agile, rapid scanning cavity ring-down spectroscopy (FARS-CRDS) measurements of the (30012)←(00001) near-infrared carbon dioxide band

Ultra-sensitive cavity ring-down spectroscopy in the mid-infrared spectral region

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