24 October 2017 Improved power and efficiency for tapered lasers with optimized photonic crystal structures
Author Affiliations +
Proceedings Volume 10457, AOPC 2017: Laser Components, Systems, and Applications; 104571O (2017) https://doi.org/10.1117/12.2284461
Event: Applied Optics and Photonics China (AOPC2017), 2017, Beijing, China
High power and high beam quality laser sources are required in numerous applications such as nonlinear frequency conversion, optical pumping of solid-state and fiber lasers, material processing and others. Tapered lasers can provide a high output power while keeping a high beam quality. However, the conventional tapered lasers suffer from a large vertical beam divergence. We have demonstrated 2-mm long tapered lasers with photonic crystal structures. A high beam quality and a narrow vertical divergence are achieved.

In this paper, we optimized the photonic crystal structure and fabricated a 4-mm long tapered laser to further increase the output power and the wall-plug efficiency. Compared with our precious wafer, the optimized structure has a lower doping level to reduce the internal loss. The period of the photonic crystal structure and the thickness of the upper cladding are also reduced. The device has a 1-mm long ridge-waveguide section and a 3-mm long tapered section. The taper angle is 4°. An output power of 7.3 W is achieved with a peak wall-plug efficiency of 46% in continuous-wave mode. The threshold current is around 500 mA and the slope efficiency is 0.93 W/A. In pulsed mode, the output power is 15.6 W and the maximum wall-plug efficiency is 48.1%. The far-field divergence with full width at half maximum is 6.3° for the lateral direction at 3 A. The vertical far-field beam divergence is around 11° at different injection levels. High beam qualities are demonstrated by beam quality factor M2 of 1.52 for the lateral direction and 1.54 for the vertical direction.
© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Xiaolong Ma, Xiaolong Ma, Hongwei Qu, Hongwei Qu, Shaoyu Zhao, Shaoyu Zhao, Xuyan Zhou, Xuyan Zhou, Yuzhe Lin, Yuzhe Lin, Wanhua Zheng, Wanhua Zheng, } "Improved power and efficiency for tapered lasers with optimized photonic crystal structures", Proc. SPIE 10457, AOPC 2017: Laser Components, Systems, and Applications, 104571O (24 October 2017); doi: 10.1117/12.2284461; https://doi.org/10.1117/12.2284461


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