Phase-related noise characteristics of 780 nm band single-frequency lasers used in the cold atomic clock

Zhang Xi^{1, 2}, Yang Fei^{1, †}, Feng Zi-Tong^{1, 2}, Zhao Jie-Jun^{1, 2}, Wei Fang¹, Cai Hai-Wen^{1, 2, ‡}, Qu Rong-Hui¹

The measured frequency fluctuation PSD and linewidth at different integration time. The blue line denotes the frequency fluctuation PSD; purple line, (β-separation line; grey line, background frequency fluctuation PSD; and red dots, linewidth at different integration time. The blue, purple, and grey lines correspond to the left axis while the red line to the right axis.