Optical to microwave clock frequency ratios with a nearly continuous strontium optical lattice clock

Optical Cavity for the Strontium Lattice Atomic Clock

The Sr lattice atomic clock in Jun Ye’s group has been experiencing frequency shifts due to the interaction between the Sr atoms in the optical trap. One possible solution is to change the optical trap in the system such that the Sr atom density, and therefore the interaction between the atoms, is reduced. For this project a test system is necessary to test the vacuum chamber viewports, which i...

A transportable optical lattice clock

We present the experimental setup and first results of PTB’s transportable Sr clock. It consists of a physics package, several compact laser breadboards, and a transportable high finesse cavity for the clock laser. A comparison of the transportable system with our stationary optical lattice clock yields an instability of 2.2 × 10−15 √ s/τ for the transportable clock. The current fractional unce...

The Strontium Optical Lattice Clock: Optical Spectroscopy with Sub-Hertz Accuracy

Micromagic clock: microwave clock based on atoms in an engineered optical lattice.

We propose a new class of atomic microwave clocks based on the hyperfine transitions in the ground state of aluminum or gallium atoms trapped in optical lattices. For such elements magic wavelengths exist at which both levels of the hyperfine doublet are shifted at the same rate by the lattice laser field, cancelling its effect on the clock transition. A similar mechanism for the magic waveleng...

Microresonator frequency comb optical clock

Optical frequency combs serve as the clockwork of optical clocks, which are now the best time-keeping systems in existence. The use of precise optical time and frequency technology in various applications beyond the research lab remains a significant challenge, but one that integrated microresonator technology is poised to address. Here, we report a silicon-chip-based microresonator comb optica...