Laser-cooled neutral atom frequency standards
Article Abstract:
Atomic fountain frequency standards are the result of advances in laser cooling techniques and the ability to launch atoms while maintaining these low temperatures. These temperatures are as low as a few microkelvins. The motion of atoms, which causes imprecision and inaccuracy in atomic frequency standards, has motivated research in the laser cooling of atoms. A Cs microwave fountain analysis predicts stability and accuracy improvements of a factor of 100 over present laboratory standards. An optical frequency standard based on a two-photon transition in xenon has the potential for stability five orders of magnitude better than current Cs standards. Neutral atom frequency standards have better signal-to-noise ratios, but exhibit larger systematic effects. The two technologies complement each other in a variety of ways.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1991
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Characterization of frequency stability in precision frequency sources
Article Abstract:
The first laboratory cesium beam clock was developed in 1955. Since that time high precision frequency standards have experienced tremendous advances, including optically pumped rubidium standards, the ultra-stable hydrogen maser, and the quality quartz-crystal-controlled oscillators used in telecommunications systems, space missions, radar and broadcasting. Frequency stability characterization parameters were needed to provide meaningful comparisons between similar devices developed by different laboratories and to access application performance in terms of measured oscillator frequency stability. A review of 25 to 30 years of progress in the characterization of frequency stability of precision frequency sources is presented.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1991
User Contributions:
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