Momentum-space crystal in narrow-line cooling of <sup>87</sup>Sr<xref rid="cpb_28_1_013701fn1" ref-type="fn">*</xref><fn id="cpb_28_1_013701fn1"><label>*</label><p>Project supported by the National Natural Science Foundation of China (Grant Nos. 11474282 and 61775220), the Key Research Project of Frontier Science of the Chinese Academy of Sciences (Grant No. QYZDB-SSW-JSC004), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21030100).</p></fn>

Momentum-space crystal in narrow-line cooling of ⁸⁷Sr**

Project supported by the National Natural Science Foundation of China (Grant Nos. 11474282 and 61775220), the Key Research Project of Frontier Science of the Chinese Academy of Sciences (Grant No. QYZDB-SSW-JSC004), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21030100).

Han Jian-Xin^{1, 2}, Lu Ben-Quan¹, Yin Mo-Juan¹, Wang Ye-Bing^{1, 2}, Xu Qin-Fang¹, Lu Xiao-Tong^{1, 2}, Chang Hong^{1, 2, †}

Evolution of the final velocity with the interaction time based on the narrow-line cooling (5s²)¹S₀–(5s5p)³P₁ (689 nm) at detuning frequency (a) 80 kHz, (b) 120 kHz, and (c) 160 kHz, respectively. The blue dashed line in the figure is the interaction time t = 20 ms.