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Atomic clock - Research | | Atomic clock - Research: Encyclopedia II - Atomic clock - Research | | Most research focuses on way to make the clocks smaller, cheaper, more accurate, and more reliable. These goals usually conflict.
A lot of research currently focuses on various sorts of ion traps. Theoretically, a single ion suspended electromagnetically could be observed for very long periods, increasing the accuracy of the clock, while also reducing its size and power consumption.
In practice, single-ion clocks have poor short term accuracy because the ion moves so much. Current research uses laser cooling of ions, with optic ...
See also:Atomic clock, Atomic clock - How they work, Atomic clock - Research | | | Atomic clock, Atomic clock - How they work, Atomic clock - Research, NIST-F1, Optical Atomic Clock [1], Radio clock, Second | | |
| | | Atomic clock: Encyclopedia II - Atomic clock - Research
Atomic clock - Research
Most research focuses on way to make the clocks smaller, cheaper, more accurate, and more reliable. These goals usually conflict.
A lot of research currently focuses on various sorts of ion traps. Theoretically, a single ion suspended electromagnetically could be observed for very long periods, increasing the accuracy of the clock, while also reducing its size and power consumption.
In practice, single-ion clocks have poor short term accuracy because the ion moves so much. Current research uses laser cooling of ions, with optical resonators to increase the short term stability of the driving optics. Much of the difficulty is related to eliminating temperature and mechanical noise effects in the resonators and lasers. No laser has achieved wide use. The result is that the ion trap is very small, but the supporting equipment is still large.
Some researchers developed clocks with different geometries of ion traps, as well. Linear clouds of ions usually have better short term accuracy than single ions. There are trade-offs.
The best developed systems use Mercury ions. Some researchers experiment with other ions. A particular isotope of Ytterbium has a particularly precise resonant frequency in one of its hyperfine transitions. Strontium has a hyperfine transition that is not as precise, but can be driven by solid-state lasers. This might permit a very inexpensive, long-lasting compact clock.
Other related archives1949, 1955, August 2004, Coordinated Universal Time, GPS, Hydrogen, International Atomic Time, Louis Essen, Mercury, NIST, NIST-F1, National Bureau of Standards, National Physical Laboratory, Radio clock, Rubidium, Russia, SI, Second, Strontium, UK, Ytterbium, atomic, battery, caesium, caesium standard, charge, clock, electricity, electronics, electrons, element, feedback loop, hyperfine transition, ionized, laser cooling, light, mW, magnetism, masers, metre, microwave, noise effects, nuclei, photocell, radio, radio clocks, radio waves, second, volt
 Adapted from the Wikipedia article "Research", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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