second harmonic generation
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Nano Letters ◽  
2022 ◽  
Author(s):  
Junjun Shi ◽  
Xiaobo He ◽  
Wen Chen ◽  
Yang Li ◽  
Meng Kang ◽  
...  

Nano Letters ◽  
2022 ◽  
Author(s):  
Zhihang Guo ◽  
Junzi Li ◽  
Jiechun Liang ◽  
Changshun Wang ◽  
Xi Zhu ◽  
...  

2022 ◽  
Author(s):  
Timo Stolt ◽  
Anna Vesala ◽  
Heikki Rekola ◽  
Petri Karvinen ◽  
Tommi hakala ◽  
...  

2022 ◽  
Author(s):  
Edgars Nitiss ◽  
Jianqi Hu ◽  
Anton Stroganov ◽  
Camille-Sophie Brès

AbstractQuasi-phase-matching has long been a widely used approach in nonlinear photonics, enabling efficient parametric frequency conversions such as second-harmonic generation. However, in silicon photonics the task remains challenging, as materials best suited for photonic integration lack second-order susceptibility (χ(2)), and means for achieving momentum conservation are limited. Here we present optically reconfigurable quasi-phase-matching in large-radius silicon nitride microresonators, resulting in up to 12.5-mW on-chip second-harmonic generated power and a conversion efficiency of 47.6% W−1. Most importantly, we show that such all-optical poling can occur unconstrained from intermodal phase-matching, leading to broadly tunable second-harmonic generation. We confirm the phenomenon by two-photon imaging of the inscribed χ(2) grating structures within the microresonators as well as by in situ tracking of both the pump and second-harmonic mode resonances during all-optical poling. These results unambiguously establish that the photogalvanic effect, responsible for all-optical poling, can overcome phase mismatch constraints, even in resonant systems.


2022 ◽  
Author(s):  
Xuehua Dong ◽  
Ling Huang ◽  
Hongmei Zeng ◽  
Zhien Lin ◽  
Guohong Zou ◽  
...  

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