Physical package for optical lattice clock

A physics package for an optical lattice clock, the physics package comprising:

• a Magneto-Optical Trap (MOT) device that is arranged along a beam axis of an atom beam, and captures an atom population;
• an optical lattice formation portion that forms an optical lattice using incident optical lattice light, confines the atom population captured by the MOT device in the optical lattice, and moves the atom population to a clock transition space for prompting clock transition along a movement axis perpendicular to the beam axis;
• and
• a vacuum chamber that comprises a cylindrical-shaped or prism-shaped main body that encloses the MOT device and the optical lattice formation portion,
• wherein a central axis of the vacuum chamber passes through the clock transition space, and is configured parallel with the beam axis, being spaced apart from the beam axis by a finite, non-zero distance,
• wherein the vacuum chamber comprises a protruding portion that protrudes from the main body along the beam axis, and
• the physics package further comprises a slower that decelerates the atom population, on an upstream side of the MOT device on the beam axis, and
• the slower is arranged astride the main body and the protruding portion, and
• the slower comprises magnetic coils.