Effective multiband synthetic four-wave mixing by cascading quadratic processes

Four wave mixing (FWM) is an important way to generate supercontinuum and frequency combs in the mid-infrared band. Here, we obtain simultaneous synthetic FWM in the visible and mid-infrared bands by cascading quadratic nonlinear processes in a periodically poled lithium niobate crystal (PPLN), whic...

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Bibliographic Details
Published in:arXiv.org 2024-03
Main Authors: Chen, Li, Zheng, Ge, Su-Jian Niu, Yin-Hai, Li, Zhao-Qi-Zhi, Han, Yue-Wei, Song, Wu-Zhen, Li, Ren-Hui, Chen, Ming-Yuan, Gao, Meng-Yu, Xie, Zhi-Yuan, Zhou, Bao-Sen, Shi
Format: Article
Language:English
Subjects:
Four-wave mixing
Gas sensors
Infrared spectra
Lithium niobates
Octaves
Online Access:Get full text
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Summary:Four wave mixing (FWM) is an important way to generate supercontinuum and frequency combs in the mid-infrared band. Here, we obtain simultaneous synthetic FWM in the visible and mid-infrared bands by cascading quadratic nonlinear processes in a periodically poled lithium niobate crystal (PPLN), which has a 110dB(at 3000nm) higher conversion efficiency than the FWM directly generated by third-order susceptibilities in bulk PPLN crystals. A general model of this process is developed that is in full agreement with the experimental verifications. The frequency difference between the new frequency components can be freely tuned by changing the frequency difference of the dual pump lasers. Furthermore, by increasing the conversion bandwidth and efficiency of the cascaded processes, it is feasible to generate frequency combs in three bands the visible, near-infrared and mid-infrared bands simultaneously through high-order cascaded processes. This work opens up a new avenue toward free-tuning multiband frequency comb generation with multi-octaves frequency spanning, which will have significant applications in fields such as mid-infrared gas sensing, lidar and precision spectroscopy.
ISSN:2331-8422