Full Stabilization of a Microresonator based Optical Frequency Comb
  We demonstrate control and stabilization of an optical frequency comb generated by four-wave mixing in a monolithic microresonator with a mode spacing in the microwave regime (86 GHz). The comb parameters (mode spacing and offset frequency) are controlled via the power and the frequency of the pump laser, which constitutes one of the comb modes. Furthermore, generation of a microwave beat note at the comb's mode spacing frequency is presented, enabling direct stabilization to a microwave frequency standard. 
P. Del'Haye, O. Arcizet, A. Schliesser, R. Holzwarth, T.J. Kippenberg