High-precision optical and microwave spectroscopy of atoms; Atomic clocks and time standards; Instrument interfaces and real-time digital control.
I carry out experimental research in atomic physics, especially high-precision spectroscopic measurements and frequency generation. My background is in nonlinear optics and optical cooling. I bring this knowledge to bear on developing atomic clocks to obtain a physical realization of the international SI second. Currently, I am improving on a primary time standard which does not lose or gain more than a millionth of a second in five years.