Active optical clock |
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Authors: | JingBiao Chen |
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Institution: | (1) Institute of Quantum Electronics, School of Electronics Engineering and Computer Science, Peking University, Beijing, 100871, China |
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Abstract: | This article presents the principles and techniques of active optical clock, a special laser combining the laser physics of
one-atom laser, bad-cavity gas laser, super-cavity stabilized laser and optical atomic clock together. As a simple example,
an active optical clock based on thermal strontium atomic beam shows a quantum-limited linewidth of 0.51 Hz, which is insensitive
to laser cavity-length noise, and may surpass the recorded narrowest 6.7 Hz of Hg ion optical clock and 1.5 Hz of very recent
optical lattice clock. The estimated 0.1 Hz one-second instability and 0.27 Hz uncertainty are limited only by the relativistic
Doppler effect, and can be improved by cold atoms.
Supported by the National Basic Research Program of China (Grant No. 2005CB724500) and National Natural Science Foundation
of China (Grant No. 10874009 |
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Keywords: | optical atomic clock laser linewidth Schawlow-Townes formula active atomic clock |
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