Zhang Fu-Ling, Fu Li-Shan, Hu Pi-Li, Han Wen-Jie, Wang Hong-Zhuo, Zhang Feng, Guan Bao-Lu. Ultra-narrow linewidth characteristics of 795-nm subwavelength grating-coupled cavity vertical cavity surface emitting laserJ. Acta Physica Sinica, 2021, 70(22): 224207. DOI: 10.7498/aps.70.20210293