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Search Publications by: John Kitching (Fed)

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Displaying 101 - 125 of 218

Glass-Blown Spherical Microcells for Chip-Scale Atomic Devices

May 2, 2008
Author(s)
E. J. Eklund, A Shkel, Svenja A. Knappe, Elizabeth Donley, John Kitching
This paper presents an application of micro glass blowing, in which multiple glass spheres are simultaneously shaped on top of a silicon wafer and subsequently filled with rubidium. The fabrication process is based on etching cavities in silicon, followed

Zero-field remote detection of NMR with a microfabricated atomic magnetometer

February 19, 2008
Author(s)
M Ledbetter, I Savukov, D Budker, V Shah, Svenja A. Knappe, John E. Kitching, D Michalak, S Xu, A Pines
We demonstrate remote detection of nuclear magnetic resonance (NMR) with a microfabricated atomic magnetometer and microfluidic channel integrated on a single device. Detection occurs at zero magnetic field, which allows operation of the magnetometer in

Rubidium Vapor Cell with Integrated Nonmetallic Multilayer Reflectors

January 13, 2008
Author(s)
M A. Perez, U Nguyen, A Shkel, Svenja A. Knappe, Elizabeth A. Donley, John E. Kitching
This paper reports on a method for improving the optical efficiency of micromachined reflectors for use in rubidium vapor cells. A hybrid bulk micromachining / multilayer thin film technique is used to form the integrated reflectors, which can redirect

Subpicotesla atomic magnetometry with a microfabricated vapour cell

November 1, 2007
Author(s)
V Shah, Svenja A. Knappe, P Schwindt, John E. Kitching
Highly sensitive magnetometers, capable of measuring magnetic fields below 1 pT, impact areas as diverse as geophysical surveying1, the detection of unexploded ordinance, space science3, nuclear magnetic resonance (NMR), and perimeter and remote monitoring

Time for a Better Receiver: Chip-Scale Atomic Frequency References

November 1, 2007
Author(s)
John E. Kitching
Atomic clocks and precision timing are at the core of almost every aspect of global navigation satellite systems (GNSS). A GNSS receiver determines its position with respect to a subset of the constellation of orbiting satellites by measuring the time

Advances in Chip-Scale Atomic Frequency References at NIST

September 12, 2007
Author(s)
Svenja A. Knappe, V Shah, Alan Brannon, Vladislav Gerginov, Hugh Robinson, Z Popovic, Leo W. Hollberg, John E. Kitching
We present new advances in the development of chip-scale atomic frequency references. Coherent population trapping (CPT) resonances usually exhibit contrasts below 10 %, when interrogated with frequency modulated lasers. A relatively simple way to increase

Demonstration of high-performance chip-scale magnetic shields

August 14, 2007
Author(s)
Elizabeth A. Donley, Eleanor Hodby, Leo W. Hollberg, John E. Kitching
We have designed and tested a set of five miniature nested magnetic shields constructed of high-permeability material, with volumes ranging from 0.01 to 2.5 cm^3. We present measurements of the longitudinal and transverse shielding factors (the ratio of

Differential Atomic Magnetometry Based on a Diverging Laser Beam

July 3, 2007
Author(s)
Eleanor Hodby, Elizabeth A. Donley, John E. Kitching
We demonstrate a novel atomic magnetometer that uses differential detection of the spatially diverging components of a light field to monitor the Larmor precession frequency of atoms in a thermal vapor. The design is implemented in compact form with a

Differential magnetometry based on a diverging laser beam

March 25, 2007
Author(s)
Eleanor Hodby, Elizabeth A. Donley, John E. Kitching
We discuss a new, compact design for a chip-scale differential atomic magnetometer that uses a single diverging laser beam to both pump and multiply probe the alkali atoms.

Chip scale atomic devices

March 13, 2007
Author(s)
Svenja A. Knappe, P Schwindt, Vladislav Gerginov, V Shah, Alan Brannon, Brad Lindseth, Li-Anne Liew, Hugh Robinson, John Moreland, Z Popovic, Leo W. Hollberg, John E. Kitching
We give an overview over our research on chip-scale atomic devices. By miniaturizing optical setups based on precision spectroscopy, we develop small atomic sensors and atomic references such as atomic clocks, atomic magnetometers, and optical wavelength

A chip-scale atomic magnetometer with improved sensitivity using the M x technique

February 26, 2007
Author(s)
P Schwindt, Brad Lindseth, Svenja A. Knappe, V Shah, John E. Kitching, Li-Anne Liew
We discuss the fabrication and performance of a miniature optically pumped atomic magnetometer constructed using microfabricated components. This device measures the spin precession frequency of an alkali atom to determine the magnetic field using the M x

Spherical Rubidium Vapor Cells Fabricated By Micro Glass Blowing

January 21, 2007
Author(s)
E. J. Eklund, A Shkel, Svenja A. Knappe, Elizabeth A. Donley, John E. Kitching
This paper presents an application of micro glass blowing, in which multiple glass spheres are simultaneously shaped on top of a silicon wafer and subsequently filled with rubidium. The fabrication process is based on etching cavities in silicon, followed

Long-Term Stability of Chip-Scale Atomic Clock Physics Packages

January 20, 2007
Author(s)
Svenja A. Knappe, Vladislav Gerginov, V Shah, Alan Brannon, Hugh Robinson, Leo W. Hollberg, John E. Kitching
We present measurements regarding the long-term stability of chip-scale atomic clock (CSAC) physics packages. The tight requirements for the temperature stability of vapor cell and laser in these packages currently limit their frequency stability after 100

Long-term Stability of NIST Chip-Scale Atomic Clock Physics Packages

December 5, 2006
Author(s)
Svenja A. Knappe, V Shah, Vladislav Gerginov, Alan Brannon, Leo W. Hollberg, John E. Kitching
We present measurements regarding the long-term frequency instability of NIST CSAC physics packages. Changes of the clock frequency are caused mainly through time-dependent light shifts by the frequency-modulated VCSEL and properties of the vapor cell. We

Magnetic Resonance in an Atomic Vapor Excited by a Mechanical Resonator

December 1, 2006
Author(s)
Ying-Ju Wang, Matthew Eardley, Svenja A. Knappe, John M. Moreland, Leo W. Hollberg, John Kitching
We demonstrate a direct resonant interaction between the mechanical motion of a mesoscopic resonator and the spin degrees of freedom of a sample of neutral atoms in the gas phase. This couplin, mediated by a magnetic particle attached to the tip of the

Magnetic resonances in atomic vapor excited by a mechanical resonator

December 1, 2006
Author(s)
Ying-ju Wang, Matt Eardley, Svenja A. Knappe, John Moreland, Leo W. Hollberg, John E. Kitching
We demonstrate a direct resonant interaction between the mechanical motion of a mesoscopic resonator and the spin degree of freedom of a sample of neutral atoms in the gas phase. This coupling, mediated by a magnetic particle attached to the tip of the

Continuous light shift correction in modualted coherent opoulation trapping clocks

October 13, 2006
Author(s)
V Shah, Vladislav Gerginov, P Schwindt, Svenja A. Knappe, Leo W. Hollberg, John E. Kitching
We demonstrate a simple technique to significantly improve the long term frequency stability of atomic clocks based on coherent population trapping (CPT). In this technique, the CPT feilds are created by a modulated diode laser and a slow servo is used to