Highly efficient octave-spanning long-wavelength infrared generation with a 74% quantum efficiency in a χ(2) waveguide by Hu, Bo, Yang, Xuemei, Wu, Jiangen, Lu, Siyi, Yang, Hang, Long, Zhe, He, Linzhen, Luo, Xing, Tian, Kan, Wang, Weizhe, Li, Yang, Wu, Han, Li, Wenlong, Guo, Chunyu, Yang, Huan, Wang, Qi Jie, Liang, Houkun

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