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We present a mid-infrared frequency comb based on a synchronously-pumped, femtosecond optical parametric oscillator. The idler (signal) is continuously tunable from 2.8-4.8 mum (1.76-1.37 mum) with a maximum average output power of 1.50 W.
Two mode-locked femtosecond fiber lasers, connected via a 7 km fiber link, are synchronized to an RMS timing jitter of 19 fs, observed over the entire Nyquist bandwidth (half of the repetition frequency of 100 MHz).
High-harmonic generation is achieved at 100 MHz repetition rates by utilizing a femtosecond enhancement cavity to increase peak intensities from a mode-locked laser. This provides a coherent frequency comb in the VUV for high-resolution spectroscopy.
We report the lowest timing jitter and tight optical phase coherence between 1550-nm mode-locked laser sources and an 800-nm femtosecond frequency comb serving as the clockwork for an optical atomic clock.
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