Toward an accurate frequency standard at 1.5 μm based on the acetylene overtone band transition. - Atsushi Onae; Ken'ichiro Okumura; Jun Yoda; Ken'ichi Nakagawa; Atsushi Yamaguchi; Motonobu Kourogi; Kazuhiro Imai; Bambang Widiyatomoko (IEEE Trans. Instrum. Meas., 1999)

Optical Frequency Synthesis From a Cryogenic Sapphire Oscillator Using a Fiber-Based Frequency Comb. - Ken-ichi Watabe; Hajime Inaba; Ken'ichiro Okumura; Feng-Lei Hong; John G. Hartnett; Clayton R. Locke; Giorgio Santarelli; Shinya Yanagimachi; Kaoru Minoshima; Takeshi Ikegami; Atsushi Onae; Shin-ichi Ohshima; et al. (IEEE Trans. Instrum. Meas., 2007)