Tapered Quantum Cascade Laser Achieving Low Divergence Angle and High Output Power by Zizhuo Liu, Hongxiao Li, Jiagang Chen, Anlan Chen, Shan Niu, Changlei Wu, Yongqiang Sun, Xingli Zhong, Hui Su, Hao Xu, Jinchuan Zhang, Jiang Wu, Fengqi Liu

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