Active optical clock
Chinese Science Bulletin(2009)
摘要
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.
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关键词
optical atomic clock,schawlow-townes formula,laser linewidth,active atomic clock,optical lattice,laser spectroscopy,spectrum,thermal noise,active optics,limiting factor
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