A transportable optical lattice clock at the National Time Service Center

Kong De-Huan^{1, 2}, Wang Zhi-Hui³, Guo Feng^{1, 2}, Zhang Qiang^{1, 2}, Lu Xiao-Tong^{1, 2}, Wang Ye-Bing¹, Chang Hong^{1, 2, †}

Laser systems for the first cooling stage: (a) schematic and (b) layout of the 461 nm laser system setup; (c) schematic and (d) layout of the repumping laser system setup. HR: the mirror with high reflectivity; L: lens; HWP: half-wave plate; PBS: polarizing beam splitter; AOM: acousto-optic modulator; PD: photodetector; PM fiber: single-mode polarization-maintaining fiber; SM fiber: single-mode fiber.