基于频率-分辨干涉自相关区分ZnOF-P微腔的二次谐波和多光子荧光

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关键词：氧化锌；频率-分辨干涉；二次谐波；多光子吸收；强耦合微腔中图分类号：0482.31 文献标识码：ADOI：10.37188/CJL.20240261 CSTR：32170.14.CJL.20240261

Distinction Between Second Harmonic Generation and Multi-photon Luminescence in ZnO F-P Microcavity via Frequency-resolved InterferometricAutocorrelation

ZHU Hai*，DONG Junxing，WANG Runchen，WANG Lisheng， WANGJingzhuo，ZHANGYifan

（StateKeyLaboratoryofOptoelectronicMaterialsand Technologies，SchoolofPhysics， SunYat-SenUniversity，Guangzhou510275，China） *CorrespondingAuthor，E-mail：zhuhai5@mail.sysu.edu.cn

Abstract：The nonlinear up-conversion opticalproperties of ZnO micro-belt and ZnO Fabry-Pérot（F-P） microcavity were studiedby using frequency-resolved interferometric autocorrelation.ZnO micro-belt were prepared by chemical vapor deposition（CVD）method and dry-transfered between a pair of distributed Bragg reflectors （DBR）to form a two-dimensional strongly coupled F-P microcavity.A home-built micro-spectroscopy system was used for interferometric autocorrlationand angle-resolved spectral measurements.Theexperimental results showed that when pumping ZnO samples with near-infrared ultrafast lasers，both second harmonic generation （SHG）and multi-photon absorption（MPA） upconversion fluorescence signals coexisted．The distinction between SHG and MPA signals could be achieved through diferent characteristic lines on the frequency spectra. In the case of ZnO F-P microcavity，SHG and MPA signals occupied different emission angles.The competitive relationship between MPA exciton-polaritons and SHG in the strong coupled microcavity system was discussed. Ourresults providedareferencefor thestudyof microcavitylasers through higher-order nonlinearupconversion methods.

Key words：zinc oxide；frequency-resolved interference；second harmonic generation；multi-photon absorption; strong coupled microcavity

1引言

2实验

近几十年来，超快激光技术的发展使得在实验室中获得 以上量级的瞬时辐射功率密度成为可能，这大幅促进了光与物质之间强非线性相互作用的相关研究，诸如高次谐波产生、多光子吸收上转换等过程。（剩余11031字）