High slope-efficiency quantum-dot lasers grown on planar exact silicon (001) with asymmetric waveguide structures

• DOI: 10.1364/oe.454895
• Publication Date: 2022-03-15T08:30:08Z
• Authors: Jun Wang; Zhuoliang Liu; Hao Liu; Yiming Bai; Bojie Ma; Chunyang Xiao; Chen Jiang; Jiachen Li; Haijing Wang; Yanxing Jia; Kai Liu; Yisu Yang; Qi Wang; Yongqing Huang; Xiaomin Ren
• Keywords: 0103 physical sciences; 01 natural sciences; 7. Clean energy

We report electrically pumped continuous-wave (CW) InAs/GaAs quantum dot lasers directly grown on planar exact silicon (001) with asymmetric waveguide structures. Surface hydrogen-annealing for the GaAs/ Si (001) templates and low-temperature growth for GaInP upper cladding layers were combined in the growth of the laser structure to achieve a high slope efficiency. For the broad-stripe edge-emitting lasers with 2-mm cavity length and 20-µm stripe width made from the above laser structure, a threshold current density of 203.5 A/cm2 and a single-facet slope efficiency of 0.158 W/A are achieved at ∼1.31 µm band under CW conditions. The extrapolated mean-time-to-failure reaches up to 21000 hours at room temperature, which is deduced from the data measured from C-mount packaged devices. Importantly, these results can provide a practical strategy to realize 1.3 µm wavelength band distributed feedback lasers directly on planar exact Si (001) templates with thin buffer layers.