Robert K. Shelton
National Institute of Standards and Technology
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Publication
Featured researches published by Robert K. Shelton.
Optics Letters | 2002
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
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
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
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
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
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
Robert K. Shelton; Long-Sheng Ma; Henry C. Kapteyn; Margaret M. Murnane; John L. Hall; J. Ye
Physical Review A | 2001
Long-Sheng Ma; Robert K. Shelton; Henry C. Kapteyn; Margaret M. Murnane; J. Ye
Archive | 2002
Jun Ye; Henry C. Kapteyn; John L. Hall; Robert K. Shelton; Margaret M. Murnane; Long-Sheng Ma
Applied Physics B | 2002
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
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National Institute of Advanced Industrial Science and Technology
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