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David Long (Assoc)

Project Leader

Nature Photonics cover
Ultrafast dual-comb spectroscopy
An artistic image of a dual-frequency comb that is generated by using an optical parametric oscillator to convert a pair of near-infrared combs into the mid-infrared. The generated combs enable nanosecond-timescale spectroscopy for probing the ultrafast dynamics found in supersonic gas jets, explosions and chemical kinetics.
Credit: Image: Brad Baxley, Part to Whole, LLC. Cover Design: Bethany Vukomanovic

David Long received his PhD in chemistry from the California Institute of Technology under the guidance of Mitchio Okumura. He then moved to the National Institute of Standards and Technology where he is currently a project leader in the Photonics and Optomechanics group.

Dr. Long’s research has focused on the development and application of ultrasensitive spectroscopic methods to present problems in optomechanics, and quantum science. Electro-optic frequency combs have been a particular focus of his work and have been applied in areas such as physical metrology, ultrafast dynamics, and atomic sensing. Recent efforts have transitioned these approaches to chip scale, integrated photonic platforms as well as demonstrated spectral translation of these combs throughout the visible and mid-infrared through the use of optical parametric oscillation.

Dr. Long’s work has been recognized by a number of awards including the Presidential Early Career Award for Scientists and Engineers, the National Science Foundation Graduate Fellowship, the Department of Commerce Silver Medal, the Sigma Xi Young Scientist Award, the National Defense Science and Engineering Fellowship, the Barry M. Goldwater Scholarship, and the Morris K. Udall Scholarship.

Research Interests

  • Optical frequency combs
  • Molecular spectroscopy
  • Integrated photonics
  • Physical sensing
  • Nonlinear optics
  • Quantum science

Awards

Selected Publications

Nanosecond time-resolved dual-comb absorption spectroscopy

Author(s)
David Long, Matthew Cich, Carl Mathurin, Garrett Mathews, Adam Heiniger, Augustine Frymire, Gregory Rieker
Frequency combs have revolutionized the field of optical spectroscopy, enabling researchers to probe molecular systems with a multitude of accurate and precise...

Publications

SINGLE-MODULATOR, DUAL COMB SERRODYNE SPECTROSCOPY

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...

Data and Software Publications

Data for manuscript "Integrated optical isolators for broadband multi-laser operation"

Author(s)
Kyunghun Han, Yiliang Bao, Junyeob Song, David Long, Sean Bresler, Daron Westly, Jason Gorman, Thomas LeBrun, Kartik Srinivasan, Vladimir Aksyuk
Theoretical calculation, modeling and experimental measurement data for the paper "Integrated optical isolators for broadband multi-laser operation" accepted for publication in Nature Photonics (2026)

Dataset presenting improved bandwidth in Rydberg atom electrometry with an optical frequency comb probe

Author(s)
Alexandra B. Artusio-Glimpse, David A. Long, Sean M. Bresler, Nikunjkumar Prajapati, Dangka Shylla, Andrew P. Rotunno, Matthew T. Simons, Samuel Berweger, Noah Schlossberger, Thomas W. LeBrun, Christopher L. Holloway
Rydberg atom-based receivers of modulated radio frequency (RF) fields are promising systems for measurements. These systems are self-calibrating, widely tunable, nearly transparent to RF fields, and

Patents (2018-Present)

Diagram of the dual optical frequency comb spectrometer consisting of a single laser that is split into local oscillator, reference and probe legs to down-convert, interleave and normalize gas sample absorption signals.

Variable-Frequency Optical Combs, Heterodyne Sensor, and Process for Performing Spectroscopy

NIST Inventors
David F. Plusquellic , David Long , Kevin O Douglass , Joseph T. Hodges and Adam J. Fleisher
This invention uses lasers and modulators to create special light waves called “optical frequency combs” that can scan multiple chemical features instantly. These combs detect chemicals by analyzing how light changes as it interacts with different substances. It’s fast, accurate, and doesn’t need
An electro-optic frequency comb is spectrally translated via nanophotonics.

Nanophotonic Spectral Translation of Electro-Optic Frequency Combs

NIST Inventors
Jordan Stone , Kartik Srinivasan and David Long
The technology consists of an apparatus and process using an electro-optic frequency comb as the pump laser, used with a nonlinear microresonator to output one or more spectrally translated frequency combs in spectroscopy.

Optomechanical Accelerometer And Performing Optomechanical Accelerometry

NIST Inventors
Jason J. Gorman , Thomas W. LeBrun and David Long
An optomechanical accelerometer includes: a fiducial mass for a microscale Fabry-Perot optical cavity; a proof mass for the microscale Fabry-Perot optical cavity, such that the proof mass oscillates in a displacement motion toward and away from the fiducial mass in response to acceleration of the
Created September 10, 2019, Updated July 8, 2026
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