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- Title
Highly efficient octave-spanning long-wavelength infrared generation with a 74% quantum efficiency in a χ<sup>(2)</sup> waveguide.
- Authors
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
- 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. A χ(2) nonlinear micro-waveguide platform is demonstrated based on the birefringence phase matching for simple and efficient long-wavelength infrared generation, which could trigger new frontiers of MIR integrated nonlinear photonics.
- Subjects
QUANTUM efficiency; SUPERCONTINUUM generation; MID-infrared spectroscopy; PARAMETRIC processes; THRESHOLD energy; PHOTONICS
- Publication
Nature Communications, 2023, Vol 14, Issue 1, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-023-42912-0