GaSe-doped polymer microfibre for secondorder nonlinear optical processes  

作　　者：Yuxin Ma Biqiang Jiang Xiao Xuan Zhen Hao Xuetao Gan Jianlin Zhao 

机构地区：[1]Key Laboratory of Light Field Manipulation and Information Acquisition,Ministry of Industry and Information Technology,and Shaanxi Basic Discipline(Liquid Physics)Research Center,School of Physical Science and Technology,Northwestern Polytechnical University,Xi’an 710129,China

出　　处：《Light(Advanced Manufacturing)》2024年第4期159-168,共10页光(先进制造)(英文)

基　　金：primarily supported by the National Natural Science Foundation of China(Nos.62375223,62322510,and 61975166);the Key Research and Development Program(Grant No.2022YFA1404800).

摘　　要：As the most fundamental,efficient frequency-mixing technology,second-order nonlinear optical effects have been extensively applied in the fields of advanced laser technology,microscopic imaging,and optical communication.However,overcoming the limitations of the centrosymmetric nature of traditional optical fibres and exciting second-order nonlinearity remains challenging.In this study,we demonstrate a functionally doped polymer microfibre to implement second-order nonlinear processes in an optical fibre system.Few-layer gallium selenide(GaSe)nanosheets with high nonlinear susceptibility χ^(2)are doped in polyvinyl alcohol(PVA)to fabricate the hybrid polymer microfibre,which enables strong second harmonic generation(SHG)and sum-frequency generation(SFG)with sub-milliwatt pump power.When pumped by a continuous-wave(CW)laser,the observable SHG signal was excited in the 1500-1630 nm wavelength range,exhibiting a theoretically predicted power dependence.The SFG response was also validated in the GaSe-doped PVA microfibre with the excitation of two CW pumps,with the signal intensity corresponding to the theoretical evolution tendency when the power and wavelength of the pump light were adjusted.Hence,developing GaSe-doped polymer microfibres provides a novel approach toward the fabrication and application of nonlinear optical fibre devices.

关 键 词：Polymer microfibre GaSe nanosheets second-order nonlinearity 

分 类 号：TN2[电子电信—物理电子学]