Results 101 to 110 of about 4,797 (280)

A review of atomic clock technology, the performance capability of present spaceborne and terrestrial atomic clocks, and a look toward the future [PDF]

Clocks have played a strong role in the development of general relativity. The concept of the proper clock is presently best realized by atomic clocks, whose development as precision instruments has evolved very rapidly in the last decades.
Vessot, Robert F. C.
core   +1 more source

Direct Kerr-frequency-comb atomic spectroscopy [PDF]

, 2018
Microresonator-based soliton frequency combs - microcombs - have recently emerged to offer low-noise, photonic-chip sources for optical measurements.
Cole, Daniel C., Diddams, Scott A, Fredrick, Connor, Kang, Songbai, Kitching, John, Newman, Zachary, Papp, Scott B., Stern, Liron, Stone, Jordan R., Suh, Myoung-Gyun, Vahala, Kerry   +10 more
core   +1 more source

Lifetime Measurement of the 6s Level of Rubidium

, 2005
We present a lifetime measurements of the 6s level of rubidium. We use a time-correlated single-photon counting technique on two different samples of rubidium atoms. A vapor cell with variable rubidium density and a sample of atoms confined and cooled in
A. D. Lange, D. V. O’Connor, E. Gomez, E. Gomez, F. Baumer, G. D. Sprouse, I. B. Khriplovich, L. A. Orozco, L. A. Orozco, P. R. Bevington, U. Volz   +10 more
core   +1 more source

Production of Miniature Glass Cells with Rubidium for Chip Scale Atomic Clock

Physics Procedia, 2015
AbstractThe main advantage of chip scale atomic clock (e.g., Knappe (2008)) (CSAC) over quartz-oscillators is the higher long-term stability. It is provided by non-aging resonance of unperturbed atoms. However it is not a simple task to suppress all possible perturbations.
Losev, S.S., Sevostianov, D.I., Vassiliev, V.V., Velishansky, V.L.   +3 more
openaire   +1 more source

Quasi‐Single‐Mode Polaritonic Crystal for Hyperbolic Phonon‐Polaritons

Advanced Optical Materials, EarlyView.
Near‐field study of the polaritonic Fourier crystal with α‐MoO3 reveals that the hyperbolic phonon‐polaritons within the Type‐I Reststrahlen band may form a quasi‐single‐mode Bloch wave where only the fundamental mode propagates in the crystal. Our results demonstrate the realization of a quasi‐single‐mode regime for the inherently multimode hyperbolic
Sergey G. Menabde, Yongjun Lim, Alexey Y. Nikitin, Pablo Alonso‐González, Jacob T. Heiden, Heerin Noh, Seungwoo Lee, Min Seok Jang   +7 more
wiley   +1 more source

Development of a Compact Laser Collimating and Beam-Expanding Telescope for an Integrated ⁸⁷Rb Atomic Fountain Clock

Photonics
In the rubidium-87 atomic fountain clock, the laser collimating and beam-expanding telescope plays a key role in atomic cooling and manipulation, as well as in realizing the cold-atom fountain.
Fan Liu, Hui Zhang, Yang Bai, Jun Ruan, Shaojie Yang, Shougang Zhang   +5 more
doaj   +1 more source

A review of precision oscillators [PDF]

Precision oscillators used in PTTI applications include quartz crystal, rubidium gas cell, cesium beam, and hydrogen maser oscillators. A general characterization and comparison of these devices is given including accuracy, stability, environmental ...
Hellwig, H.
core   +1 more source

Biodegradable Carbonate Nanogels Loaded with Anti MFAP‐5 siRNA for Anti‐stromal Therapy of Hepatocellular Carcinoma

Advanced Science, EarlyView.
Polycarbonate nanogels enable lipid‐free delivery of anti‐MFAP‐5 siRNA into cancer‐associated fibroblasts (CAF) in hepatocellular carcinoma. In a cirrhotic murine model, this approach silences MFAP‐5, reduces fibroblast activation, and suppresses tumor growth by inhibiting NOTCH/Hes1‐driven angiogenesis. CAF‐targeted MFAP‐5 RNAi and conserved signaling
Paul Schneider, Alexander Fuchs, Michael Fichter, Vanessa Bolduan, Jenny Schunke, Özlem Akilli, Nádia C. Correia, Yannick Ehlers, Christian Czysch, Pia Winterwerber, Eliana Stanganello, Barbara Schrörs, Mustafa Diken, Christoph Eckert, Shusruto Rishik, Andreas Keller, Jörn M. Schattenberg, Stephan Grabbe, Matthias Bros, Lutz Nuhn, Leonard Kaps   +20 more
wiley   +1 more source

Calcium Shock Enables Efficient and Programmable Particle Delivery for Genome Editing Applications

Advanced Science, EarlyView.
Classical transfection and transduction are inefficient, particularly with confluent cells and organoids, and lack cell type‐specific programmability. This study presents calcium shock (CaSh), a method that dramatically improves particle delivery into single cells, colonies, and organoids.
Nicole Vo, Lorena de Oñate, Maximillian Frank, Xian Hu, Sophie M. Blackburn, Dana V. Foss, Jasmine Villegas, Kunica Asija, Dirk Hockemeyer, Hongxia Fu, Raymond J. Monnat, Ross C. Wilson, Benjamin S. Freedman   +12 more
wiley   +1 more source

Agile low phase noise radio-frequency sine wave generator applied to experiments on ultracold atoms

, 2007
We report on the frequency performance of a low cost (~500$) radio-frequency sine wave generator, using direct digital synthesis (DDS) and a field-programmable gate array (FPGA).
De Bellair, Julien De Lapeyre, Lopez, Olivier, Morizot, Olivier, Perrin, Hélène, Pottie, Paul-Eric, Wiotte, Fabrice   +5 more
core   +1 more source