Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Robert K. Shelton is active.

Publication


Featured researches published by Robert K. Shelton.


Optics Letters | 2002

Subfemtosecond timing jitter between two independent, actively synchronized, mode-locked lasers

Robert K. Shelton; Long-Sheng Ma; John L. Hall; Henry C. Kapteyn; Margaret M. Murnane; Mark Notcutt; J. Ye

With the implementation of a fast-bandwidth servo, along with improved laser construction and associated better passive stability, we have achieved subfemtosecond relative timing jitter between two independent, actively synchronized, mode-locked Ti:sapphire lasers. Timing jitter of 0.58 fs is obtained with a 160-Hz observation bandwidth over several seconds. Within a 2-MHz observation bandwidth, the timing jitter is 1.75 fs. Excellent repeatability and rapid speed in setting an arbitrary time delay between two pulses are also demonstrated.


Journal of Modern Optics | 2002

Active synchronization and carrier phase locking of two separate mode-locked femtosecond lasers

Robert K. Shelton; Long-Sheng Ma; Henry C. Kapteyn; Margaret M. Murnane; John L. Hall; J. Ye

Two independent mode-locked femtosecond lasers are synchronized to an unprecedented precision. The rms timing jitter between the lasers is 4.3 fs observed within a 160 Hz bandwidth over tens of seconds, or 26 fs within a 50 kHz bandwidth. Novel multi-stage phase-locked loops help to preserve this ultrahigh timing resolution while setting on arbitrary delay between the two pulse trains (0–5 ns). Under such synchronization, phase locking between the carrier frequencies of the two femtosecond lasers has been achieved. It is also demonstrated that the same level of synchronization can be achieved with two lasers at different repetition frequencies.


Proceedings SPIE 4269: Laser Frequency Stabilization, Standards, Measurement, and Applications | 2001

Synchronization and phase lock of two mode-locked femtosecond lasers

Robert K. Shelton; Long-Sheng Ma; Henry C. Kapteyn; Margaret M. Murnane; John L. Hall; J. Ye

Two independent mode-locked femtosecond lasers are synchronized to an unprecedented precision. The rms timing jitter between the lasers is 4.3 fs observed within a 160 Hz bandwidth over tens of seconds, or 26 fs within a 50 kHz bandwidth. Novel multi-stage phase locked loops help to preserve this ultrahigh timing resolution throughout the entire delay range between pulses (10 ns). We also demonstrate that the same level of synchronization can be achieved with two lasers at different repetition frequencies. Under such synchronization, phase lock between the carrier frequencies of the two fs lasers has been achieved.


Laser Spectroscopy - The XV International Conference on Laser Spectroscopy - Proceedings of the XV International Conference" | 2002

Merging Two Independent Femtosecond Lasersinto One

L . Ma; Robert K. Shelton; Henry C. Kapteyn; Margaret M. Murnane; John L. Hall; J. Ye; Steven Chu; V. Vuletić; A. J. Kerman; C. Chin

Two independent mode-locked femtosecond lasers are synchronized and phase-locked to an unprecedented precision. The timing jitter between the two fs lasers is less than 5 fs rms, observed within a 160-Hz bandwidth over minutes. The beat frequency between the two synchronized fs lasers has a standard deviation of 0.15 Hz at 1-s averaging time under phaselocked conditions. Coherence between the two lasers is demonstrated via spectral interferometry and second order field cross-correlation when the two fs lasers are tightly synchronized and phase-locked. The auto-correlation measurement of the combined pulse reveals a narrower and larger amplitude “synthesized’ pulse.


conference on lasers and electro optics | 2001

Coherent pulse synthesis from two (formerly) independent passively mode-locked Ti:sapphire oscillators

Robert K. Shelton; Long-Sheng Ma; John L. Hall; C. Kapteyn; Margaret M. Murnane; J. Ye

Summary form only given. We present our recent breakthrough in pulse synthesis via synchronizing and phase-locking two independent mode-locked lasers. The resultant synthesized pulse train indicates for the first time to our knowledge, phase coherence between two separate femtosecond lasers.


conference on lasers and electro optics | 2001

Sub-15-femtosecond active synchronization of two passively mode-locked Ti:sapphire oscillators

Robert K. Shelton; Long-Sheng Ma; Henry C. Kapteyn; Margaret M. Murnane; J. Ye

Summary form only given. The ability to synchronize a passively-modelocked laser to an external reference, or to a second laser, has many applications. Previous work synchronizing two mode-locked Ti:sapphire lasers has demonstrated timing jitters of at best a few hundred femtoseconds. Since it is now routine to generate pulses with duration <20 fs, improved techniques would make it possible to take full advantage of this time resolution for applications such as sum- and difference-frequency mixing, novel pulse generation and shaping techniques, and for novel laser/accelerator based light sources. This paper presents a new technique that allows us to robustly synchronize pulse trains from separate lasers with a timing jitter of <15 fs. We use two independent mode-locked Ti:sapphire lasers, running at 780 nm and 820 nm. Our synchronization scheme consists of three phase lock loops working at different timing resolutions.


Science | 2001

Phase-coherent optical pulse synthesis from separate femtosecond lasers

Robert K. Shelton; Long-Sheng Ma; Henry C. Kapteyn; Margaret M. Murnane; John L. Hall; J. Ye


Physical Review A | 2001

Sub-10-femtosecond active synchronization of two passively mode-locked Ti:sapphire oscillators

Long-Sheng Ma; Robert K. Shelton; Henry C. Kapteyn; Margaret M. Murnane; J. Ye


Archive | 2002

Multistage synchronization of pulsed radiation sources

Jun Ye; Henry C. Kapteyn; John L. Hall; Robert K. Shelton; Margaret M. Murnane; Long-Sheng Ma


Applied Physics B | 2002

Phase-coherent synthesis of optical frequencies and waveforms

J. Ye; Steven T. Cundiff; Tara M. Fortier; John L. Hall; Kevin W. Holman; David J. Jones; J. D. Jost; Henry C. Kapteyn; K A. Leeuwen; L . Ma; Margaret M. Murnane; J.-L. Peng; Robert K. Shelton

Collaboration


Dive into the Robert K. Shelton's collaboration.

Top Co-Authors

Avatar
Top Co-Authors

Avatar
Top Co-Authors

Avatar

J. Ye

National Institute of Standards and Technology

View shared research outputs
Top Co-Authors

Avatar

John L. Hall

University of Colorado Boulder

View shared research outputs
Top Co-Authors

Avatar

Long-Sheng Ma

National Institute of Standards and Technology

View shared research outputs
Top Co-Authors

Avatar

L . Ma

East China Normal University

View shared research outputs
Top Co-Authors

Avatar

Mark Notcutt

National Institute of Standards and Technology

View shared research outputs
Top Co-Authors

Avatar

Jun Ye

National Institute of Advanced Industrial Science and Technology

View shared research outputs
Top Co-Authors

Avatar

Ariel R. Libertun

University of Colorado Boulder

View shared research outputs
Top Co-Authors

Avatar

C. Kapteyn

University of Colorado Boulder

View shared research outputs
Researchain Logo
Decentralizing Knowledge