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Research Interests:

We construct different types of atomic clocks to generate optical frequencies that have demonstrated a fractional instability approaching 1 part in 10¹⁸听and an absolute fractional frequency uncertainty below 10^-17. We develop laser frequency combs to connect stable optical frequencies to each other and to microwave sources with an imprecision听below 1 part in 10¹⁹. These state-of-the-art frequency combs are also developed for other important applications, including ultra-low noise microwave generation, chip-scale sensors, mid-IR molecular spectroscopy, optical waveform generation,and calibration of astronomical spectrographs for searches for exo-planets.