Oxide-aperture-dependent output characteristics of circularly symmetric VCSEL structure
Liao Wen-Yuan1, 2, Li Jian3, Li Chuan-Chuan2, 3, Guo Xiao-Feng1, Guo Wen-Tao1, Liu Wei-Hua1, 2, Zhang Yang-Jie1, 2, Wei Xin2, 3, Tan Man-Qing1, 2, †
       

Spectra and near-field images of 9-μm VCSEL.