Development of optical frequency standards based upon the 2 S1/2-2D5/2 transition in 88 Sr+ and 87Sr+. - Geoffrey P. Barwood; Kelin Gao; Patrick Gill; Guilong Huang; Hugh A. Klein (IEEE Trans. Instrum. Meas., 2001)

Observation of a Sub-10-Hz Linewidth 88Sr+ 2S1/2-2D5/2 Clock Transition at 674 nm. - Geoffrey P. Barwood; Patrick Gill; Guilong Huang; Hugh A. Klein (IEEE Trans. Instrum. Meas., 2007)