Hao Zhen, Jiang Biqiang, Hou Yueguo, Li Chenyang, Yi Ruixuan, Ji Yafei, Li Jiajie, Li Ailun, Gan Xuetao, Zhao Jianlin
Opt Lett. 2021 Feb 15;46(4):733-736. doi: 10.1364/OL.413451.
We report the achievement of continuous-wave (CW)-pumped second-harmonic generation (SHG) and sum frequency generation (SFG) in a layered indium selenide (InSe)-integrated microfiber. As a result of the strong interaction between the InSe nanosheets and the evanescent field, the second-order nonlinear processes are greatly enhanced in the InSe-integrated microfiber pumped by a few milliwatt CW lasers. The experimental results reveal that the intensities of SHG and SFG are quadratic and linear dependencies with the incident pump power, respectively, which is consistent with theoretical predictions. Additionally, the SHG intensity is strongly polarization-dependent on the nonaxisymmetrical distribution of the InSe nanosheets around the microfiber, providing the possibility of the SHG-polarized manipulation. The proposed device has the potential to be integrable into all-fiber systems for nonlinear applications.
我们报道了在层状硒化铟（InSe）集成微光纤中实现连续波（CW）泵浦的二次谐波产生（SHG）和和频产生（SFG）。由于InSe纳米片与倏逝场之间的强相互作用，在由几毫瓦连续波激光器泵浦的InSe集成微光纤中，二阶非线性过程得到了极大增强。实验结果表明，SHG和SFG的强度分别与入射泵浦功率呈二次方和线性依赖关系，这与理论预测一致。此外，SHG强度强烈依赖于微光纤周围InSe纳米片的非轴对称分布的偏振，为SHG偏振操纵提供了可能性。所提出的器件具有集成到用于非线性应用的全光纤系统中的潜力。
