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Search Publications by: John Kitching (Fed)

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Displaying 126 - 150 of 218

Continuous Light Shift Correction in Modulated CPT 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

A compact phase delay technique for increasing the amplitude of coherent population trapping resonances in open Lambda systems

August 1, 2006
Author(s)
V Shah, Svenja A. Knappe, P Schwindt, Vladislav Gerginov, John E. Kitching, Leo W. Hollberg
We propose and demonstrate a novel technique for increasing the amplitude of coherent population trapping (CPT) resonance in open Lambda systems. The technique requires no complex modifications to the conventional CPT setup and is compatible with standard

A compact phase delay technique for increasing the amplitude of coherent population trapping resonances in open Lambda systems

August 1, 2006
Author(s)
V Shah, Svenja A. Knappe, P Schwindt, Vladislav Gerginov, John E. Kitching, Leo W. Hollberg
We propose and demonstrate a novel technique for increasing the amplitude of coherent population trapping (CPT) resonance in open Lambda systems. The technique requires no complex modifications to the conventional CPT setup and is compatible with standard

Atom-based stabilization for laser-pumped atomic clocks

June 15, 2006
Author(s)
Vladislav Gerginov, V Shah, Svenja A. Knappe, Leo W. Hollberg, John E. Kitching
We describe a novel technique for stabilizing frequency shifts in laser-interrogated vapor-cell atomic clocks. The method suppresses frequency shifts due to changes in the laser frequency, intensity and modulation index as well as atomic vapor density. The

A Local Oscillator for Chip-Scale Atomic Clocks at NIST

June 5, 2006
Author(s)
Alan Brannon, J Breitbarth, Z Popovic, Vladislav Gerginov, V Shah, Svenja A. Knappe, Leo W. Hollberg, John E. Kitching
We report the first local oscillator (LO) demonstrating viability in terms of performance, size, and power, for chip-scale atomic clocks (CSAC) at the National Institute of Standards and Technology in Boulder, CO. This volgate-controlled oscillator (VCO)

Active light-shift stabilization in modulated CPT clocks

June 5, 2006
Author(s)
V Shah, P Schwindt, Vladislav Gerginov, Svenja A. Knappe, Leo W. Hollberg, John E. Kitching
We demonstrate a simple technique to significantly improve the long-term frequency stability in atomic clocks based on coherent population trapping (CPT). In this technique an additional servo is used to control the local oscillator power level to ensure

Chip-Scale Atomic Devices

June 4, 2006
Author(s)
John E. Kitching, Svenja A. Knappe, P Schwindt, Ying-ju Wang, Hugh Robinson, Leo W. Hollberg, Li-Anne Liew, John Moreland, Alan Brannon, J Breitbarth, Brad Lindseth, Z Popovic, V Shah, Vladislav Gerginov, Matt Eardley
We present an overview of recent work to develop chip-scale atomic devices such as frequency references and magnetometers. These devices take advantage of advances over the last ten years in the fields of micro electro mechanical systems (MEMS), precision

Magnetometry with millimeter-scale anti-relaxation-coated alkali-metal vapor cells

June 1, 2006
Author(s)
M V. Balabas, D Budker, John E. Kitching, P Schwindt, Jason Stalnaker
Dynamic nonlinear magneto-optical-rotation signals with frequency- and amplitude-modulated laser light have been observed and investigated with a spherical glass cell of 3-mm diameter containing Cs metal with inner walls coated with para?n. Intrinsic

Microfabricated atomic clocks and magnetometers

May 31, 2006
Author(s)
Svenja A. Knappe, P Schwindt, Vladislav Gerginov, V Shah, Hugh Robinson, Leo W. Hollberg, John E. Kitching, Li-Anne Liew, John Moreland
We demonstrate the critical subsystems of compact atomic clocks and magnetometers based on microfabricated physics packages. The clock components have a volume below 5 cm 3, a fractional frequency instability below 6x10 -10/τ 1⁄2, and consume 200 mW of

Chip scale atomic magnetometers

April 19, 2006
Author(s)
John M. Moreland, John Kitching, Peter D. Schwindt, Svenja A. Knappe, Li-Anne Liew, V Shah, V Gerginov, Ying-Ju Wang, Leo W. Hollberg
We are developing a new class of sensors based on atoms confined in micro-fabricated enclosures. Recent work at the National Institute of Standards and Technology (NIST) has lead to a prototype chip scale atomic clock (CSAC) with remarkable operating

Long-term frequency instability of atomic frequency references based on coherent population trapping and microfabricated vapor cells

April 1, 2006
Author(s)
Vladislav Gerginov, Svenja A. Knappe, P Schwindt, V Shah, Leo W. Hollberg, John E. Kitching
We present an evaluation of the long-term frequency instability and environmental sensitivity of a chip-scale atomic clock based on coherent population trapping, particularly as affected by the light source subassembly. We find that the clock frequency is

Long-Term Frequency Instability of CPT Clocks With Microfabricated Vapor Cells

April 1, 2006
Author(s)
Vladislav Gerginov, Svenja A. Knappe, P Schwindt, V Shah, Leo W. Hollberg, John E. Kitching
We present an evaluation of the long-term frequency instability and environmental sensitivity of a chip-scale atomic clock based on coherent population trapping, particularly as affected by the light source subassembly. We find that the clock frequency is

Atom-based stabilization for laser-pumped atomic clocks

March 27, 2006
Author(s)
Vladislav Gerginov, V Shah, Svenja A. Knappe, Leo W. Hollberg, John E. Kitching
Progress towards simplification and improvement of the long-term stability of chip-scale atomic clocks is presented. The conventional technique of laser optical frequency and cell temperature control is compared with a novel technique which avoids the use

High-Contrast CPT Resonances

February 7, 2006
Author(s)
John E. Kitching
The performance of an atomic clock or magnetometer based on CPT is determined by the resonance width and the signal-to-noise ratio. In particular, a large signal amplitude results in a high stability for a clock or a high sensitivity for a magnetometer

Long-term Frequency Stability of Chip-Scale Atomic Clocks

January 26, 2006
Author(s)
Vladislav Gerginov, Svenja A. Knappe, V Shah, P Schwindt, Leo W. Hollberg, John E. Kitching
We present an evaluation of the long-term frequency instability and environmental sensitivity of a chip-scale atomic clock based on coherent population trapping (CPT), particularly as affected by the light source subassembly. The long-term frequency

Chip-Scale Atomic Devices at NIST

January 25, 2006
Author(s)
John E. Kitching
The NIST program on chip-scale atomic devices (CSAD) seeks to design, build and characterize miniature atomic instruments and sensors based on fabrication techniques traditionally used in the field of microelectronics and micro-electric-mechanical systems