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Search Publications by: Scott Diddams (Assoc)

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Displaying 1 - 25 of 323

Photonic Millimeter-wave Generation Beyond the Cavity Thermal Limit

February 11, 2025
Author(s)
William Groman, Igor Kudelin, Takuma Nakamura, Yifan Liu, Charles McLemore, Franklyn Quinlan, Scott Diddams, Dahyeon Lee, Megan Kelleher, Joel Guo, Warren Jin, John Bowers
With the next generation of telecommunications and radar/navigation upon us, moving from the microwave to the higher bandwidth, millimeter-wave domain has become ever relevant. Simultaneously, the burgeoning field of photonic integrated chips has yielded a

Ultrastable vacuum-gap Fabry-Perot cavities 2 operated in air

August 21, 2024
Author(s)
Susan Schima, Franklyn Quinlan, Yifan Liu, Charles McLemore, Takuma Nakamura, Nazanin Hoghooghi, Scott Diddams, Peter Rakich, Dahyeon Lee, Naijun Jin, Megan Kelleher, Haotian Cheng
We demonstrate a vacuum-gap ultrastable optical reference cavity that does not require a vacuum enclosure. Our simple method of optical contact bonding in a vacuum environment allows for cavity operation in air while maintaining vacuum between the cavity

Dual-comb correlation spectroscopy of thermal light

May 23, 2024
Author(s)
Eugene Tsao, Alexander Lind, Connor Fredrick, Ryan Cole, Peter Chang, Kristina Chang, Dahyeon Lee, Matthew Heyrich, Nazanin Hoghooghi, Franklyn Quinlan, Scott Diddams
The detection of light of thermal origin is the principal means by which humanity has learned about our world and the cosmos. In optical astronomy, in particular, direct detection of thermal photons and the resolution of their spectra have enabled

Tunable X-band opto-electronic synthesizer with ultralow phase noise

March 29, 2024
Author(s)
Igor Kudelin, Pedram Shirmohammadi, William Groman, Samin Hanifi, Megan Kelleher, Dahyeon Lee, Takuma Nakamura, Charles McLemore, Steven Bowers, Franklyn Quinlan, Scott Diddams
Microwave signals with low phase noise in the X-band (8-12 GHz) are essential for widespread technologies and important scientific developments. Photonic techniques, such as optical frequency division (OFD), leverage the high spectral purity of low-noise

Multi-harmonic near-infrared-ultraviolet dual-comb spectrometer

March 19, 2024
Author(s)
Kristina Chang, Daniel Lesko, Carter Mashburn, Peter Chang, Eugene Tsao, Alexander Lind, Scott Diddams
Dual-comb spectroscopy in the ultraviolet (UV) and visible would enable broad bandwidth electronic spectroscopy with unprecedented frequency resolution. However, there are significant challenges in generation, detection, and processing of dual-comb data

Photonic chip-based low noise microwave oscillator

March 6, 2024
Author(s)
Igor Kudelin, William Groman, Scott Diddams, Dahyeon Lee, Megan Kelleher, Takuma Nakamura, Charles McLemore, Franklyn Quinlan, Qing-Xin Ji, Joel Guo, Andrey Matsko, John Bowers, Kerry Vahala, Warren Jin, Lue Wu, Yifan Liu, Wei Zhang, Steven Bowers, Joe Campbell, Pedram Shirmohammadi, Samin Hanifi, Haotian Cheng, Naijun Jin, Sam Halliday, Zhaowei Dai, Chao Xiang, Vladimir Iltchenko, Owen Miller, Peter Rakich
Numerous modern technologies are reliant on the low-phase noise and timing stability performance of microwave signals. Substantial progress has been made in the field of microwave photonics, whereby low noise microwave signals are generated by the down

Low-noise microwave generation with an air-gap optical reference cavity

January 30, 2024
Author(s)
Yifan Liu, Dahyeon Lee, Takuma Nakamura, Naijun Jin, Haotian Cheng, Megan Kelleher, Charles McLemore, Igor Kudelin, William Groman, Scott Diddams, Peter Rakich, Franklyn Quinlan
We demonstrate a high finesse, microfabricated mirror-based, air-gap cavity with volume less than 1 ml, constructed in an array, that can support low-noise microwave generation through optical frequency division. We use the air-gap cavity in conjunction

Visible to Ultraviolet Frequency Comb Generation in Lithium Niobate Nanophotonic Waveguides

January 15, 2024
Author(s)
Tsung Han Wu, Luis Ledezma, Connor Fredrick, Pooja Sekhar, Ryoto Sekine, Quishi Guo, Ryan Briggs, Alireza Marandi, Scott Diddams
The introduction of nonlinear nanophotonic devices to the field of optical frequency comb metrology has enabled new opportunities for low-power and chip-integrated clocks, high-precision frequency synthesis, and broad bandwidth spectroscopy. However, most

A novel approach to interface high-Q Fabry-Perot resonators with photonic circuits

November 3, 2023
Author(s)
Haotian Cheng, Naijun Jin, Zhaowei Dai, Chao Xiang, Joel Guo, Yishu Zhou, Scott Diddams, John Bowers, Owen Miller, Peter Rakich
The unique benefits of Fabry–Pérot resonators as frequency-stable reference cavities and as an efficient interface between atoms and photons make them an indispensable resource for emerging photonic technologies. To bring these performance benefits to next

Thermal-light heterodyne spectroscopy with frequency comb calibration

February 18, 2022
Author(s)
Scott Diddams, Connor Fredrick, Franklyn Quinlan, Ryan Terrien, Suvrath Mahadevan, Freja Olsen
Precision laser spectroscopy is key to many developments in atomic and molecular physics and the advancement of related technologies such as atomic clocks and sensors. However, in important spectroscopic scenarios, such as astronomy and remote sensing, the

Carrier-Envelope Phase Stabilization of Modelocked Lasers

October 12, 2021
Author(s)
T M. Fortier, D J. Jones, Scott Diddams, John L. Hall, Jun Ye, S T. Cundiff, R S. Windeler
Carrier-envelope phase stabilization of few cycle optical pulses has recently been realized. This advance in femtosecond technology is important in both extreme nonlinear optics and optical frequency metrology. The development of air-silica microstructure

Broadband stability of the Habitable Zone Planet Finder Fabry-Perot etalon calibration system:evidence for chromatic variation

July 8, 2021
Author(s)
Ryan C. Terrien, Joe P. Ninan, Scott Diddams, Suvrath Mahadevan, Samuel Halverson, Chad Bender, Connor Fredrick, Fred Hearty, Jeffrey M. Jennings, Andrew J. Metcalf, Andrew J. Monson, Arpita Roy, Christian Schwab, Gudmundur Stefansson
The comb-like spectrum of a white light-illuminated Fabry-Pérot etalon can serve as a cost-effective and stable reference source for precise Doppler measurements. Understanding the stability of these devices across their broad (100's of nm) spectral

Single-cycle all-fiber frequency comb

July 8, 2021
Author(s)
Sida Xing, Daniel Lesko, Takeshi Umeki, Tsung Han Wu, Alexander Lind, Nazanin Hoghooghi, Scott Diddams
Broad bandwidth mid-infrared frequency combs are important for molecular spectroscopy in a wide range of fundamental and applied research. However, realization of such light sources in a compact and robust format remains a challenge. In this paper, we

Frequency Ratio Measurements with 18-Digit Accuracy Using a Network of Optical Clocks

March 24, 2021
Author(s)
Kyle Beloy, Martha I. Bodine, Tobias B. Bothwell, Samuel M. Brewer, Sarah L. Bromley, Jwo-Sy Chen, Jean-Daniel Deschenes, Scott Diddams, Robert J. Fasano, Tara Fortier, Youssef Hassan, David Hume, Dhruv Kedar, Colin J. Kennedy, Isaac Kader, Amanda Koepke, David Leibrandt, Holly Leopardi, Andrew Ludlow, Will McGrew, William Milner, Daniele Nicolodi, Eric Oelker, Tom Parker, John M. Robinson, Stefania Romisch, Stefan A. Schaeffer, Jeffrey Sherman, Laura Sinclair, Lindsay I. Sonderhouse, William C. Swann, Jian Yao, Jun Ye, Xiaogang Zhang
Atomic clocks occupy a unique position in measurement science, exhibiting higher accuracy than any other measurement standard and underpinning six out of seven base units in the SI system. By exploiting higher resonance frequencies, optical atomic clocks

Fully phase-stabilized 1 GHz turnkey frequency comb at 1.5 mm

March 15, 2021
Author(s)
Daniel Lesko, Alexander Lind, Nazanin Hoghooghi, Abijith S. Kowligy, Henry R. Timmers, Pooja Sekhar, Benjamin Rudin, Florian Emaury, Gregory B. Rieker, Scott Diddams
Low noise and high repetition rate optical frequency combs have been desirable for many applications from timekeeping to precision spectroscopy. With higher power per comb mode, gigahertz repetition rates enable rapid spectroscopic sensing in a dual-comb

Measurement of the 27Al+ and 87Sr absolute optical frequencies

January 21, 2021
Author(s)
Holly Leopardi, Kyle Beloy, Tobias B. Bothwell, Samuel M. Brewer, Sarah L. Bromley, Jwo-Sy Chen, Scott Diddams, Robert J. Fasano, Youssef S. Hassan, David B. Hume, Dhruv Kedar, Colin J. Kennedy, Isaac H. Khader, David R. Leibrandt, Andrew D. Ludlow, William F. McGrew, William R. Milner, Daniele Nicolodi, Eric Oelker, Thomas E. Parker, John M. Robinson, Stefania Romisch, Jeffrey A. Sherman, Lindsay I. Sonderhouse, William C. Swann, Jian Yao, Jun Ye, Xiaogang Zhang, Tara M. Fortier
We perform absolute measurement of the 27Al+ single-ion and 87Sr neutral lattice clock frequencies at the National Institute of Standards and Technology and JILA at the University of Colorado against a global ensemble of primary frequency standards. Over

Optical Frequency Combs: Coherently Uniting the Electromagnetic Spectrum

July 17, 2020
Author(s)
Scott Diddams, Kerry J. Vahala, Thomas Udem
Optical frequency combs were introduced around 20 years ago as a laser technology that could synthesize and count the ultrafast rate of the oscillating cycles of light. Functioning in a manner analogous to a clockwork of gears, the frequency comb phase

Frequency stability of the mode spectrum of broad bandwidth Fabry-Perot interferometers

April 27, 2020
Author(s)
Jeffrey M. Jennings, Ryan C. Terrien, Connor Fredrick, Michael Grisham, Mark Notcutt, Samuel Halverson, Suvrath Mahadevan, Scott Diddams
When illuminated by a white light source, the discrete resonances of a Fabry- Perot interferometer (FP) provide a broad bandwidth, comb-like spectrum useful for frequency calibration. We report on the design, construction, and laboratory characterization

Frequency-comb spectroscopy on pure quantum states of a single molecular ion

March 27, 2020
Author(s)
Chin-wen Chou, Alejandra L. Collopy, Christoph Kurz, Yiheng Lin, Michael E. Harding, Philipp N. Plessow, Tara M. Fortier, Scott A. Diddams, Dietrich G. Leibfried, David R. Leibrandt
Spectroscopy is a powerful tool for studying molecular properties and is commonly performed on large thermal ensembles of molecules that are perturbed by motional shifts and interactions with the environment and one another, resulting in convoluted spectra

Optical-Clock-Based Time Scale

October 30, 2019
Author(s)
Jian Yao, Jeffrey A. Sherman, Tara M. Fortier, Andrew D. Ludlow, Holly Leopardi, Thomas E. Parker, William F. McGrew, Scott A. Diddams, Judah Levine
A time scale is a procedure for accurately and continuously marking the passage of time. It is exemplified by coordinated universal time (UTC), and provides the backbone for critical navigation tools such as the global positioning system (GPS). Present

Nonlinear Silicon waveguides produce tunable frequency combs spanning 2.0-8.5 ?m

September 25, 2019
Author(s)
Nima Nader, Abijith S. Kowligy, Jeffrey T. Chiles, Eric J. Stanton, Henry R. Timmers, Alexander J. Lind, Kimberly Briggman, Scott Diddams, Flavio Caldas da Cruz, Richard Mirin, Sae Woo Nam, Daniel M. Lesko
We present fully air clad suspended-silicon waveguides for efficient nonlinear interactions limited only by the silicon transparency. Novel fork-shaped couplers provide efficient input ( 2 dB) and broadband 3 dB output coupling spanning 6.0-8.5 υm

Terahertz-Rate Kerr-Microresonator Optical Clockwork

August 12, 2019
Author(s)
Tara E. Drake, Travis Briles, Daryl T. Spencer II, Jordan R. Stone, David R. Carlson, Daniel D. Hickstein, Qing Li, Daron A. Westly, Kartik A. Srinivasan, Scott A. Diddams, Scott B. Papp
Kerr microresonators generate interesting and useful fundamental states of electromagnetic radiation through nonlinear interactions of continuous-wave (CW) laser light. When implemented with photonic-integration techniques, functional devices with low