Abstract
We describe an ultrastable cesium (Cs) atomic clock with a regeneratively mode-locked fiber laser obtained by use of an optically pumped Cs beam tube. By adopting a -long Cs beam tube with a linewidth of , we have successfully obtained frequency stabilities of for and for for a microwave output signal. This Cs atomic clock can generate an optical pulse train with the same stability as that of the obtained microwave, which allows us to deliver a frequency standard optical signal throughout the world by means of optical fiber networks.
© 2005 Optical Society of America
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