title: Ultrastable cesium atomic clock with a 9.1926-GHz regeneratively mode-locked fiber laser.
abstract: We describe an ultrastable cesium (Cs) atomic clock with a 9.1926-GHz regeneratively mode-locked fiber laser obtained by use of an optically pumped Cs beam tube. By adopting a 1-m-long Cs beam tube with a linewidth of 110 Hz, we have successfully obtained frequency stabilities of 4.8 x 10(-12) for tau = 1 s and 6.3 x 10(-13) for tau = 50 s for a 9.1926-GHz 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.
authors: Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan. tsugu@riec.tohoku.ac.jp
authors: Masatsugu
authors: M
authors: Yakabe
authors: Ko
authors: K
authors: Nito
authors: Masato
authors: M
authors: Yoshida
authors: Masataka
authors: M
authors: Nakazawa
authors: Yasuki
authors: Y
authors: Koga
authors: Ken
authors: K
authors: Hagimoto
authors: Takeshi
authors: T
authors: Ikegami