Colloquium: Femtosecond optical frequency combs

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Cavity-enhanced direct frequency comb spectroscopy (2008, background): “Due to both the uniformity of the frequency comb mode spacing at the 10−19 level [9] and the possibility to stabilize individual modes to below 10−15 fractional frequency stability [4, 10–12], they have indeed revolutionized the field.”
Quantum information with Rydberg atoms (2009, methodology): “Modern frequency comb techniques(Cundiff and Ye, 2003) could also be used for both frequency and phase stabilization of the Rydberg lasers.”
Far-field optical imaging and manipulation of individual spins with nanoscale resolution. (2010, neutral): “dtd" [ ]> Optical techniques constitute powerful tools for spin detectionand manipulation that enable applications ranging from atomic clock”
Temporal solitons in optical microresonators (2012, background): “f-2f or 2f-3f interferometry [50, 51] is an important future technical milestone for microresonator based combs (including soliton based combs).”