System Development and Clock Transition Spectroscopy Detection of Transportable 87Sr Optical Clock

This work mainly presents the system development and clock transition spectroscopy detection of a transportable Sr-87 optical lattice clock. The optical clock system uses a miniaturized physical system with a size of 120 cmX 50 cm X 60 cm, which connects the modularized sub-optical system through fibers. After subsequent to cooling with a first stage 161 nm laser and a second stage 689 nm laser, a cold atomic cloud with an atomic number of 1.02X 10(6) and an atomic temperature of 5.15 mu K is obtained. The lattice light with a magic-wavelength is used to load Sr-87 in one-dimensional optical lattice with a lifetime of 434 ms, and an atomic temperature in lattice of 1.63 p.K. The atoms arc detected using an ultra-narrow lincwidth 698 nm clock laser to obtain the clock transition spectrum with distinguishable sidcbands, the degenerate spectrum with narrow lincwidth, the spin-polarized spectrum, and the Rabi-flopping curve. The spin-polarized spectrum with lincwidth of 11. 79 Hz is obtained under the condition of clock laser interrogating, which is fairly close to the theoretical value of Fourier limit lincwidth and can be as the frequency reference for the future optical clock closed-loop.