Providing 1E-16 short-term stability of a 1.5 {\mu}m laser to optical   clocks
  We report on transferring 1E-16-level fractional frequency stability of a "master laser" operated at 1.5 {\mu}m to a "slave laser" operated at 698 nm, using a femtosecond fiber comb as transfer oscillator. With the 698 nm laser, the 1S_0 - 3P_0 clock transition of 87Sr was resolved to a Fourier-limited line width of 1.5 Hz (before: 10 Hz). Potential noise sources contributed by the frequency comb are discussed in detail. 
C. Hagemann, C. Grebing, T. Kessler, St. Falke, C. Lisdat, H. Schnatz,   F. Riehle, U. Sterr
physics.optics physics.atom-ph