Highly efficient octave-spanning long-wavelength infrared generation with a 74% quantum efficiency in a χ(2) waveguide

Bo Hu, Xuemei Yang, Jiangen Wu, Siyi Lu, Hang Yang, Zhe Long, Linzhen He, Xing Luo, Kan Tian, Weizhe Wang, Yang Li, Han Wu (), Wenlong Li, Chunyu Guo, Huan Yang (), Qi Jie Wang and Houkun Liang ()
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Bo Hu: Sichuan University
Xuemei Yang: Sichuan University
Jiangen Wu: Shenzhen Technology University
Siyi Lu: Sichuan University
Hang Yang: Sichuan University
Zhe Long: Sichuan University
Linzhen He: Sichuan University
Xing Luo: Shenzhen University
Kan Tian: Sichuan University
Weizhe Wang: Sichuan University
Yang Li: Sichuan University
Han Wu: Sichuan University
Wenlong Li: Chengdu Dien PHOTOELECTRIC Technology Co., Ltd.
Chunyu Guo: Shenzhen University
Huan Yang: Shenzhen Technology University
Qi Jie Wang: Nanyang Technological University
Houkun Liang: Sichuan University

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract The realization of compact and efficient broadband mid-infrared (MIR) lasers has enormous impacts in promoting MIR spectroscopy for various important applications. A number of well-designed waveguide platforms have been demonstrated for MIR supercontinuum and frequency comb generations based on cubic nonlinearities, but unfortunately third-order nonlinear response is inherently weak. Here, we propose and demonstrate for the first time a χ(2) micrometer waveguide platform based on birefringence phase matching for long-wavelength infrared (LWIR) laser generation with a high quantum efficiency. In a ZnGeP2-based waveguide platform, an octave-spanning spectrum covering 5–11 μm is generated through optical parametric generation (OPG). A quantum conversion efficiency of 74% as a new record in LWIR single-pass parametric processes is achieved. The threshold energy is measured as ~616 pJ, reduced by more than 1-order of magnitude as compared to those of MIR OPGs in bulk media. Our prototype micro-waveguide platform could be extended to other χ(2) birefringence crystals and trigger new frontiers of MIR integrated nonlinear photonics.

Date: 2023
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DOI: 10.1038/s41467-023-42912-0

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