U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications by: Scott Diddams (Assoc)

Search Title, Abstract, Conference, Citation, Keyword or Author
Displaying 51 - 75 of 313

Demonstration of near-IR line-referenced electro-optical laser comb for precision radial velocity measurement in astronomy

January 27, 2016
Author(s)
Scott A. Diddams, K Vahala, J Li, Gabriel G. Ycas, P Plavchan, S Leifer, J Sandhu, G Vasisht, P Chen, P Gao, J Gagne, M Bottom, E.C. Martin, M.P. Fitzgerald, G Doppmann, C Beichman, X Yi
We describe a successful effort to produce a laser comb around 1.55 micron in the astronomical H band (1.5-1.8 micron) using a method based on a line-referenced, electro-optical-modulation frequency comb (LR-EOFC). The LR-EOFC is a spectrum of equally

Octave-spanning supercontinuum generation via microwave frequency multiplication

October 12, 2015
Author(s)
Daniel C. Cole, Katja M. Beha, Scott B. Papp, Scott A. Diddams
We demonstrate a system based on telecom components for the generation of an octave-spanning supercontinuum from a continuous-wave laser. The system utilizes direct multiplication of the 10 GHz signal derived from a synthesizer. Pulses are carved from the

Broadly tunable, low timing jitter, high repetition rate optoelectronic comb generator

October 1, 2015
Author(s)
Franklyn J. Quinlan, A. J. Metcalf, Tara M. Fortier, Scott A. Diddams, Andrew M. Weiner
We investigate the low timing jitter properties of a tunable single-pass optoelectronic frequency comb generator. The scheme is flexible in that both the repetition rate and the center frequency can be continuously tuned. When operated at 10 GHz comb

240 Hz linewidth Brillouin laser from a microrod whispering gallery mode resonator

September 29, 2015
Author(s)
William Loh, Aurelien C. Coillet, Frederick N. Baynes, Scott B. Papp, Scott A. Diddams, Joe Becker
We demonstrate an ultra-low noise laser that oscillates based on the stimulated Brillouin scattering nonlinearity in an optical microresonator. Our Brillouin laser employs a microrod resonator whose larger mode volume compared to conventional resonators

Self-referencing a CW laser with efficient nonlinear optics

July 26, 2015
Author(s)
Scott B. Papp, Katja M. Beha, Daniel C. Cole, Pascal P. Del'Haye, Aurelien C. Coillet, Scott A. Diddams
We phase-coherently measure the frequency of continuous-wave (CW) laser light by use of optical-phase modulation and 'f-2f' nonlinear interferometry. Periodic electro-optic modulation (EOM) transforms the CW laser into a continuous train of picosecond

Mid-Infrared Optical Frequency Combs based on Difference Frequency Generation for Dual-Comb Spectroscopy

May 10, 2015
Author(s)
Flavio Caldas da Cruz, Daniel I. Maser, Todd Johnson, Gabriel G. Ycas, Andrew M. Klose, Fabrizio R. Giorgetta, Ian R. Coddington, Nathan R. Newbury, Scott A. Diddams
Mid-infrared femtosecond optical frequency combs at 2.8 - 3.5 υm were produced by difference frequency generation of the spectral components of a near-infrared comb in a 3-mm long MgO:PPLN crystal. We observe strong pump depletion and 9.3 dB parametric

Dual-microcavity narrow-linewidth Brillouin laser

March 5, 2015
Author(s)
William Loh, Adam A. Green, Frederick N. Baynes, Daniel C. Cole, Franklyn J. Quinlan, Hansuek Lee, Kerry J. Vahala, Scott A. Diddams
The tunable narrow-linewidth laser is a revolutionary metrology tool that is critical in precision spectroscopy and the determination of fundamental physical constants, displacement measurements at the 10 -20 level, and the development of the most advanced

Attosecond timing in optical-to-electrical conversion

February 10, 2015
Author(s)
Frederick N. Baynes, Franklyn J. Quinlan, Tara M. Fortier, Qiugui Zhou, Andreas Beling, Joe C. Campbell, Scott A. Diddams
The most frequency-stable sources of electromagnetic radiation are produced optically, and optical frequency combs provide the means for high fidelity frequency transfer across hundreds of terahertz and into the microwave domain. A critical step in the

Phase steps and resonator detuning measurements in microresonator frequency combs

January 7, 2015
Author(s)
Pascal P. Del'Haye, Aurelien C. Coillet, William Loh, Katja M. Beha, Scott B. Papp, Scott A. Diddams
Significant progress has been made in the last years towards a better understanding and theoretical modeling of Kerr-effect induced generation of optical frequency combs in microresonators. However, the simultaneous interaction of hundreds or thousands of

Broadband Noise Limit in the Photodetection of Ultralow Jitter Optical Pulses

November 14, 2014
Author(s)
Franklyn J. Quinlan, W. Sun, Tara M. Fortier, Jean-Daniel Deschenes, Yang Fu, Scott A. Diddams, Joe Campbell
Applications with optical atomic clocks and precision timing often require the transfer of optical frequency references to the electrical domain with extremely high fidelity. Here we examine the impact of photocarrier scattering and distributed absorption

High-Power and High-Linearity Photodetector Modules for Microwave Photonic Applications

October 15, 2014
Author(s)
Frederick N. Baynes, Efthymios Rouvalis, Xiaojun Xie, Qiugui Zhou, Franklyn J. Quinlan, Tara M. Fortier, Scott A. Diddams, Andreas G. Steffan, Andreas Beling, Joe C. Campbell
We demonstrate hermetically packaged InGaAs/InP photodetector modules for high performance microwave photonic applications. The devices employ an advanced photodiode epitaxial layer known as the modified uni-traveling carrier photodiode (MUTC-PD) with

Electro-optical frequency division and stable microwave synthesis

July 19, 2014
Author(s)
Scott A. Diddams, Jiang Li, Xu Li, Hansuek Lee, Kerry J. Vahala
Optical frequency division using a mode-locked- laser, frequency comb has revolutionized time keeping and the generation of stable microwave signals. A different approach for optical frequency division and microwave generation using a comb of frequencies

Microresonator frequency comb optical clock

July 1, 2014
Author(s)
Scott B. Papp, Katja M. Beha, Pascal P. Del'Haye, Franklyn J. Quinlan, Hansuek Lee, Kerry J. Vahala, Scott A. Diddams
Optical frequency combs enable measurement precision at the 20th digit, and measurement accuracy entirely commensurate with their reference oscillator. A new direction in experiments is the creation of ultracompact frequency combs by way of nonlinear

Phase and coherence of optical microresonator frequency combs

May 9, 2014
Author(s)
William Loh, Pascal P. Del'Haye, Scott B. Papp, Scott A. Diddams
We investigate the phase and coherence properties of microresonator combs using a combination of theoretical analysis, numerical simulation, and experimental measurement. Our analysis reveals that the comb phase in many cases does not stabilize to an

Optical amplification and pulse interleaving for low noise photonics microwave generation

March 12, 2014
Author(s)
Franklyn J. Quinlan, Frederick N. Baynes, Tara M. Fortier, Qiugui Zhou, Allen Cross, Joe Campbelll, Scott A. Diddams
We investigate the impact of pulse interleaving and optical amplification on the spectral purity of microwave signals generated by photodetecting the pulsed output of an Er:fiber-based optical frequency comb. It is shown that the microwave phase noise

Supercontinuum generation in an on-chip silica waveguide

February 13, 2014
Author(s)
Scott A. Diddams, Dong Yoon Oh, David Sell, Hansuek Lee, Ki Youl Yang, Kerry J. Vahala
Supercontinuum generation is demonstrated in an on-chip silica spiral waveguide by launching 180-fs pulses from an optical parametric oscillator at the center wavelength 1330 nm. With a coupled pulse energy of 2.17 nJ, the broadest spectrum in the

Optical phase-noise dynamics of Titanium:sapphire optical frequency combs

January 24, 2014
Author(s)
Qudsia Quraishi, Scott A. Diddams, Leo W. Hollberg
Stabilized optical frequency combs (OFC) can have remarkable levels of coherence across their broad spectral bandwidth. We study the scaling of the optical noise across hundreds of nanometers of optical spectra. We measure the residual phase noise between

Spiral Resonators for On-Chip Laser Frequency Stabilization

September 17, 2013
Author(s)
Scott A. Diddams, Hansuek Lee, Myoung-Gyun Suh, Tong Chen, Jiang Li, Kerry J. Vahala
Frequency references are indispensable to radio, microwave, and time keeping systems, with far reaching applications in navigation, communi- cation, remote sensing, and basic science. Over the past decade there has been an optical revo- lution in time

State-of-the-Art RF Signal Generation From Optical Frequency Division

September 2, 2013
Author(s)
Archita Hati, Craig W. Nelson, Corey A. Barnes, Danielle G. Lirette, Tara M. Fortier, Franklyn J. Quinlan, Jason A. DeSalvo, Andrew D. Ludlow, Till P. Rosenband, Scott A. Diddams, David A. Howe
We present the design of a novel, ultra-low phase-noise frequency synthesizer implemented with extremely low noise regenerative frequency dividers. This synthesizer generates eight outputs viz. 1.6 GHz, 320 MHz, 160 MHz, 80 MHz, 40 MHz, 20 MHz, 10 MHz and