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, †}

Schematic of the experimental setup and timing sequence. (a) The counter-propagating incident laser from three directions. The incident optical powers of the 461 nm trapping laser, 689 nm trapping laser, and 689 nm stirring laser are 13 mW, 2 mW, and 1 mW, respectively. (b) The experimental timing sequence.