Optimal oxide-aperture for improving the power conversion efficiency of VCSEL arrays*
Wang Wen-Juan, Li Chong, Zhou Hong-Yi, Wu Hua, Luan Xin-Xin, Shi Lei, Guo Xia†
       
Plots of optical output power, power conversion efficiency, and voltage in insets versus current with the values of oxide-aperture D a of 6 μm, 19 μm, 29 μm, and 39 μm for (a) 4×4 VCSEL arrays and (b) 2×2 VCSEL arrays. The dash–dot lines represent the output powers of 14.34 mW, 57.30 mW, and 235.90 mW for the single VCSEL emitter, the 2×2 VCSEL and the 4×4 VCSEL arrays with 29-μm oxide-apertures, at 30 mA, 120 mA, and 480 mA, respectively.