Publications

Displaying 1 - 25 of 243

SINGLE-MODULATOR, DUAL COMB SERRODYNE SPECTROSCOPY

July 3, 2024

Author(s)

Jasper Stroud, David Long, David Plusquellic

Dual optical frequency comb spectroscopy allows for high speed, broadband measurements without any moving parts. Here, we combine differential chirp down conversion to probe large spectral bandwidths in the near-infrared (NIR) and serrodyne modulation to

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

December 1, 2023

Author(s)

Jasper Stroud, Gerd Wagner, David Plusquellic

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 DIAL signals (IP-DIAL) from aerosol targets for ranges up to 22 km. The

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

September 20, 2023

Author(s)

David Long, Jasper Stroud, Benjamin Reschovsky, Yiliang Bao, Feng Zhou, Thomas W. LeBrun, David Plusquellic, Jason Gorman, Sean Bresler

Cavity optomechanical sensors offer exceptional sensitivity but 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 cavity optomechanical

Study on Local Power Plant Emissions Using Multi-Frequency Differential Absorption LIDAR and Real-Time Plume Tracking

August 31, 2023

Author(s)

Jasper Stroud, Will Dienstfrey, David Plusquellic

We present a new fiber-amplifier-based differential absorption light detection and ranging (DIAL) system for range-resolved detection of carbon dioxide (CO2) and water vapor (H2O) over a range of a few kilometers. The fiber amplifier chain is seeded with a

High-speed hyperspectral and phase-contrast THz imaging using differential chirped pulse down conversion

May 12, 2023

Author(s)

Jasper Stroud, Kimberly Briggman, David Plusquellic

We demonstrate a THz imaging system using chirped pulses to acquire amplitude and phase information of various samples, enabling hyperspectral imaging and axial optical path delay determination approximately 50x better than the diffraction limited lateral

Jet-Cooled Phosphorescence Excitation Spectrum of the T1(n,p?) - S0 Transition of 4H-Pyran-4-one

April 17, 2023

Author(s)

Sean Parsons, Hucek Devon, mMishra Piyush, David Plusquellic, Timothy Zwier, Stephen Drucker

The 4H-pyran-4-one (4PN) molecule is a cyclic conjugated enone with spectroscopically accessible singlet and triplet (n,π∗) excited states. Vibronic spectra of 4PN provide a stringent test of electronic-structure calculations. We report here the T1(n,π∗)

Dual chirped-pulse electro-optical frequency comb method for simultaneous molecular spectroscopy and dynamics studies: formic acid in the terahertz region

August 1, 2022

Author(s)

Jasper Stroud, David F. Plusquellic

An electro-optic dual-comb system based on chirped-pulse waveforms is used to simultaneously acquire temporally magnified rapid passage signals and normal spectral line shapes from the back-transformation to the time domain. Multi-heterodyne terahertz (THz

Dual Chirped-Pulse Electro-Optic Comb Generation in the THz Region: Spanning the Spectroscopic and Quantum Dynamics Domains

May 20, 2022

Author(s)

Jasper Stroud, David Plusquellic

A new THz difference-frequency chirped-pulse dual-comb method based on electro-optic phase modulators (EOMs) and two near-visible continuous wave lasers is used to perform high resolution spectroscopy and to magnify the rapid passage signal response.

Range resolved CO2 measurements over 3 km using a 10-point fiber-based differential-absorption LIDAR (DIAL) system

May 20, 2022

Author(s)

Jasper Stroud, David Plusquellic

We present a multi-frequency DIAL system based on a fast-switching wavelength source and fiber optic amplification to acquire range-resolved dry-air CO2 concentrations over the city of Boulder, Colorado USA

Validation of a multi-frequency differential absorption LIDAR (DIAL) system from aerosol and cloud retrievals

May 20, 2022

Author(s)

Jasper Stroud, David Plusquellic

A ten wavelength DIAL system based on a 100 Hz optical parametric oscillator (OPO) is used to simultaneously acquire range-resolved and integrated path dry-air CO2 concentrations from soft cloud targets in Boulder, Colorado.

Difference-Frequency Chirped-Pulse Dual-comb Generation in the THz Region: Magnification of Molecular Dynamics of Water Vapor Lines by > 60,000

January 24, 2022

Author(s)

Jasper Stroud, David Plusquellic

A new difference frequency method to perform terahertz dual-comb spectroscopy is reported based on electro-optic phase modulators (EOMs) and two free-running lasers. A variation of a near-IR interleaving scheme we recently reported has been developed to

Interleaved Electro-Optic Dual Comb Generation to Expand Bandwidth and Scan Rate for Molecular Spectroscopy and Dynamics Studies near 1.6 mm

October 11, 2021

Author(s)

Jasper Stroud, James Simon, Gerd Wagner, David Plusquellic

A chirped-pulse interleaving method is reported for generation of dual optical frequency combs based on electro-optic phase modulators (EOM) in a free-running all-fiber based system. The interleaving scheme effectively separates the EOM's (+) and (-)

Rotationally resolved electronic S1 spectra of tryptoline and oxindole: Reversal of the 1La and 1Lb state character

August 30, 2021

Author(s)

Josue Minguela-Gallardo, John Yi, David Plusquellic, Leonardo Alvarez-Valtierra

Rotationally resolved S1←S0 fluorescence excitation spectra of the lowest electronic transitions (origin bands) of tryptoline (TRY) and oxindole (OXI) have been recorded and analyzed. A higher vibronic band of OXI has also been observed and assigned. The

Rapid Passage Signals from CO2 at 1.6 um Using a Dual Chirped-Pulse Electro-Optic Comb System with High-Order Interleaving

May 14, 2021

Author(s)

Jasper Stroud, David Plusquellic, James Simon, Gerd Wagner

We demonstrate a method for interleaving high-order sidebands in a fast-sweeping electro-optic dual-comb system. We probe CO2 at 1.6 um and show sweep-rate dependent rapid-passage effects modeled with the Maxwell-Bloch equations.

Rotationally Resolved UV Spectroscopy of the Rotamers of Indole-4-Carboxylic Acid: Evidence of Charge Transfer Quenching

April 14, 2020

Author(s)

John Yi, Sergio Romero Servin, Leonardo Alvarez Valtierra, David F. Plusquellic

Rotationally resolved electronic spectra of two conformational isomers of jet-cooled Indole-4-Carboxylic Acid (I4CA) and the deuterated forms of the acid (COOD) and amide (N-D) groups have been obtained using a UV laser/molecular beam spectrometer. The in

Multi-frequency differential absorption LIDAR system for remote sensing of CO2 and H2O near 1.6 mm

July 17, 2018

Author(s)

Gerd A. Wagner, David F. Plusquellic

The specifications and performance of a ground-based differential absorption LIDAR (light detection and ranging) system (DIAL) using an optical parametric oscillator (OPO) are presented. The OPO is injection-seeded with the output of a confocal filter

Accurate and Precise Laser Spectroscopy: Emerging Technology for the Study of Atmospheric Constituents, Radiative Transfer, and Planetary Dynamics

May 21, 2018

Author(s)

Adam J. Fleisher, David A. Long, Joseph T. Hodges, Gerd A. Wagner, David F. Plusquellic

Electromagnetically induced transparency in vacuum and buffer gas potassium cells probed via electro-optic frequency combs

October 24, 2017

Author(s)

David A. Long, Adam J. Fleisher, David F. Plusquellic, Joseph T. Hodges

Electromagnetically induced transparency (EIT) in 39K and 41K was probed using electro-optic frequency combs generated by applying chirped waveforms to a phase modulator. The carrier tone of the frequency comb served as the pump beam and induced the

Multiheterodyne Spectroscopy Using Multi-frequency Combs

May 13, 2017

Author(s)

David F. Plusquellic, Gerd A. Wagner, Adam Fleisher, David Long, Joseph T. Hodges

Near-IR dual frequency combs generated from waveform driven electro-optic phase modulators (EOMs) are used for high resolution studies in low pressure cells and for remote sensing from natural targets (Boulder Flatirons). Arbitrary waveform generators

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