首页|Broadband second-harmonic generation in thin-film lithium niobate microdisk via cyclic quasi-phase matching
Broadband second-harmonic generation in thin-film lithium niobate microdisk via cyclic quasi-phase matching
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Whispering-gallery-mode[WGM]microresonators can greatly enhance light-matter interaction,making them indispen-sable units for frequency conversion in nonlinear optics.Efficient nonlinear wave mixing in microresonators requires strin-gent simultaneous optical resonance and phase-matching conditions.Thus,it is challenging to achieve efficient frequency conversion over a broad bandwidth.Here,we demonstrate broadband second-harmonic generation[SHG]in the x-cut thin-film lithium niobate[TFLN]microdisk with a quality factor above 107 by applying the cyclic quasi-phase-matching[CQPM]mechanism,which is intrinsically applicable for broadband operation.Broadband SHG of continuous-wave laser with a maxi-mum normalized conversion efficiency of～15％o/mW is achieved with a bandwidth spanning over 100 nm in the telecom-munication band.Furthermore,broadband SHG of femtosecond lasers,supercontinuum lasers,and amplified spontaneous emission in the telecommunication band is also experimentally observed.The work is beneficial for integrated nonlinear photonics devices like frequency converters and optical frequency comb generator based on second-order nonlinearity on the TFLN platform.
State Key Laboratory of Advanced Optical Communication Systems and Networks,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China
School of Electronic and Electrical Engineering,Shanghai University of Engineering Science,Shanghai 201620,China
Shanghai Research Center for Quantum Sciences,Shanghai 201315,China
Collaborative Innovation Center of Light Manipulations and Applications,Shandong Normal University,Jinan 250358,China
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国家自然科学基金国家自然科学基金国家自然科学基金国家重点研发计划上海市科技计划重大项目Yangyang Development Fund
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