Optical frequency metrology

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Mid-infrared dual-comb spectroscopy with 2.4 μm Cr2+:ZnSe femtosecond lasers (2010, background): “Introduced in the late 1990s, laser frequency combs have revolutionized [1,2] precise measurements of frequency and time.”
High-energy pulse synthesis with sub-cycle waveform control for strong-field physics (2011, background): “Each breakthrough in generation methods has led to new scientific discoveries in a wide range of field”
Optical frequency comb technology for ultra‐broadband radio‐frequency photonics (2014, background): “[7] F.”
High‐precision wavelength calibration of astronomical spectrographs with laser frequency combs (2007, background): “Therefore, the frequency comb is offset from being exact integer harmonics ofνr by the so-called carrierenvelope offset frequency,νce = ∆ϕ/2πT (Udem et al. 2002).”
Nobel Lecture: Defining and measuring optical frequencies (2006, methodology): “Recent tests at NIST, BIPM, and ECNU Ma et al., 2004 confirm the earlier MPQ experiments Udem et al., 2002 showing that the comb principle is strictly correct up to a measurement precision of more than 18 digits.”