High-efficiency second-order nonlinear processes in an optical microfibre assisted by few-layer GaSe
作者机构：MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710129China
出 版 物：《Light(Science & Applications)》 (光（科学与应用)（英文版）)
年 卷 期：2020年第9卷第1期
页 面：1410-1417页
核心收录：
学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学]
基 金：supported by the National Natural Science Foundation of China(Grant Nos.61775182,61975166,61775183) the Natural Science Basic Research Plan in Shaanxi Province of China(Grant Nos.2019JM-330,2018JM1058) the Fundamental Research Funds for the Central Universities(Grant No.3102019PB005)
摘 要：The centrosymmetric nature of silica fibre precludes the realisation of second-order nonlinear processes in optical fibre ***,the integration of 2D materials with optical fibres has opened up a great opportunity to develop allfibre active ***,we demonstrate high-efficiency second-order nonlinear frequency conversions in an optical microfibre assisted with few-layer gallium selenide(GaSe)*** to the strong evanescent field of the microfibre and ultrahigh second-order nonlinearity of the GaSe nanoflakes,second harmonic generation(SHG)and sum-frequency generation(SFG)are effectively achieved with only sub-milliwatt continuous-wave(CW)lasers in the wavelength range of 1500–1620 nm,covering the C and L telecom *** SHG intensity from the microfibre is enhanced by more than four orders of magnitude with the assistance of the GaSe nanoflakes on fibre nonlinear ***,in the SFG process,the intensity transfer between different frequencies can be effectively manipulated by changing the wavelengths and powers of two pump *** realised strong second-order nonlinearity in the GaSe-integrated microfibre might expand the applications of all-fibre devices in all-optical signal processing and new light source generation at awkward wavelengths.
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