Jun Ye

TL;DR: An ultracold dense gas of potassium-rubidium (40K87Rb) polar molecules is created using a single step of STIRAP with two-frequency laser irradiation to coherently transfer extremely weakly bound KRb molecules to the rovibrational ground state of either the triplet or the singlet electronic ground molecular potential.

TL;DR: In this article, the authors review the spectacular accuracy and stability gains that can be obtained when working with laser cooled ions or neutral atoms and discuss some important applications of these optical clocks, from geodesy to tests of fundamental theories to many body physics.

TL;DR: A review of the current state of the art in the research field of cold and ultracold molecules can be found in this paper, where a discussion is based on recent experimental and theoretical work and concludes with a summary of anticipated future directions and open questions in rapidly expanding research field.

TL;DR: A great simplification in the long-standing problem of measuring optical frequencies in terms of the cesium primary standard is demonstrated, enabling us to measure the 282 THz frequency of an iodine-stabilized Nd:YAG laser directly in Terms of the microwave frequency that controls the comb spacing.

TL;DR: In this paper, the authors review the frequency-domain description of a mode-locked laser and the connection between the pulse phase and the frequency spectrum in order to provide a basis for understanding how the absolute frequencies can be determined and controlled.