Parity non-conservation in atoms. Picosecond spectroscopy.
Excitons, energy transfer in solids and Anderson
localization.
Positronium and muonium spectroscopy. Biophysics. Laser
cooling and trapping of atoms, atom interferometry. Polymer
physics

1978~1983 Technical Staff, Bell Laboratories, Murray hall
1983~1987 Head, Quantum Electronics Research Dept., AT&T
Bell Laboratories
1987~ Professor, Stanford Univ.
1989~1996 Associate Editor, Optics Letters
1992~ Member, American Academy of Arts and Sciences
1993~ Member, National Academy of Sciences
1994~ Member, Academica Sinica
1998 Foreign Member, Chinese Academy of Sciences

1987 Am. Phys. Soc., Broida Prize for Laser Spectroscopy
1990 APS/AAPT Richtmyer Memorial Prize Lecture
1993 King Faisal International Prize for Science
1994 Am. Phys. Soc., Arthur Schawlow Prize for Laser Science
1995 Science for Art Prize (Sponsored by LVMH)
1997 Nobel Prize in Physics