Interleaved electro-optic dual comb generation to expand bandwidth and scan rate for molecular spectroscopy and dynamics studies near 1.6 µm

Stroud, Jasper R.; Simon, James B.; Wagner, Gerd; Plusquellic, David F.

doi:10.1364/oe.434482

Cited by 9 publications

(2 citation statements)

References 68 publications

(91 reference statements)

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“…Furthermore, efforts are underway to extend the measurement bandwidth of the frequency converter to measure additional lines. As we have shown previously [42], the scan bandwidth can be increased by as much as 4 cm −1 (120 GHz) by using the higher order sidebands of the electro-optic phase modulator for frequency generation [11]. For the CH 4 line, the extension to 1.75 cm −1 (53 GHz) is all that is required to capture a second water vapor line, (1 01 -2 12 ), at 6078.25 cm −1 .…”

Section: Discussionsupporting

confidence: 76%

Multi-Frequency Differential Absorption LIDAR (DIAL) System for Aerosol and Cloud Retrievals of CO2/H2O and CH4/H2O

Stroud,

Wagner,

Plusquellic

2023

Remote Sensing

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We discuss a remote sensing system that is used to simultaneously detect range-resolved differential absorption LIDAR (light detection and ranging; DIAL) signals and integrated path differential absorption LIDAR signals (IPDA LIDAR) from aerosol targets for ranges up to 22 km. The DIAL/IPDA LIDAR frequency converter consists of an OPO pumped at 1064 nm to produce light at 1.6 μm and operates at 100 Hz pulse repetition frequency. The probe light is free space coupled to a movable platform that contains one transmitter and two receiver telescopes. Hybrid photon counting/current systems increase the dynamic range for detection by two orders of magnitude. Range resolved and column integrated dry-air CO2 and CH4 mixing ratios are obtained from line shape fits of CO2 and CH4 centered at 1602.2 nm and 1645.5 nm, respectively, and measured at 10 different frequencies over ≈1.3 cm−1 bandwidth. The signal-to-noise ratios (SNRs) of the IPDA LIDAR returns from cloud aerosols approach 1000:1 and the uncertainties in the mixing ratios weighted according to the integrated counts over the cloud segments range from 0.1% to 1%. The range-averaged DIAL mixing ratios are in good agreement with the IPDA LIDAR mixing ratios at the 1% to 2% level for both CO2 and CH4. These results can serve as a validation method for future active and passive satellite observational systems.

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Section: Discussionsupporting

confidence: 76%

Multi-Frequency Differential Absorption LIDAR (DIAL) System for Aerosol and Cloud Retrievals of CO2/H2O and CH4/H2O

Stroud,

Wagner,

Plusquellic

2023

Remote Sensing

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“…Due to the reduced efficiency at both the Tx and Rx photomixers, the SNR is reduced by roughly two-fold for this spectral region. Figure S4a shows the magnitude and phase of the temporally magnified spectra showing the direction of rapid passage response moving towards the comb's center frequency [1,6]. In contrast, the other Rx chirp produces the rapid passage response shown in Fig.…”

Section: S5 Additional Datamentioning

confidence: 99%

Supplementary document for A dual chirped-pulse electro-optical frequency comb method for simultaneous molecular spectroscopy and dynamics studies: Formic acid in the THz region - 5920393.pdf

Stroud,

Plusquellic

2022

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High accuracy, high dynamic range optomechanical accelerometry enabled by dual comb spectroscopy

Long,

Stroud,

Reschovsky

et al. 2023

APL Photonics

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Cavity optomechanical sensors can offer exceptional sensitivity; however, interrogating the cavity motion with high accuracy and dynamic range has proven to be challenging. Here, we employ a dual optical frequency comb spectrometer to readout a microfabricated cavity optomechanical accelerometer, allowing for rapid simultaneous measurements of the cavity’s displacement, finesse, and coupling at accelerations up to 24 g (236 m/s2). With this approach, we have achieved a displacement sensitivity of 2 fm Hz−1/2, a measurement rate of 100 kHz, and a dynamic range of 7.6 × 105, which is the highest we are aware of for a microfabricated cavity optomechanical sensor. In addition, comparisons of our optomechanical sensor coupled directly to a commercial reference accelerometer show agreement at the 0.5% level, a value that is limited by the reference’s reported uncertainty. Furthermore, the methods described herein are not limited to accelerometry but rather can be readily applied to nearly any optomechanical sensor where the combination of high speed, dynamic range, and sensitivity is expected to be enabling.

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Interleaved electro-optic dual comb generation to expand bandwidth and scan rate for molecular spectroscopy and dynamics studies near 1.6 µm

Cited by 9 publications

References 68 publications

Multi-Frequency Differential Absorption LIDAR (DIAL) System for Aerosol and Cloud Retrievals of CO2/H2O and CH4/H2O

Multi-Frequency Differential Absorption LIDAR (DIAL) System for Aerosol and Cloud Retrievals of CO2/H2O and CH4/H2O

Supplementary document for A dual chirped-pulse electro-optical frequency comb method for simultaneous molecular spectroscopy and dynamics studies: Formic acid in the THz region - 5920393.pdf

High accuracy, high dynamic range optomechanical accelerometry enabled by dual comb spectroscopy

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