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Coupling ideality of standing-wave supermode microresonators

Photonics Research 2024年第08期12卷 1610-1618页

作者： MIN WANG YUECHEN LEI ZHI-GANG HU chenghao lao YUANLEI WANG XIN ZHOU JINCHENG LI QI-FAN YANG BEI-BEI LI Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking University School of Physics Beihang University Collaborative Innovation Center of Extreme Optics Shanxi University Songshan Lake Materials Laboratory

Standing-wave supermode microresonators that are created through the strong coupling between counter-propagating modes have emerged as versatile platforms for sensing and nonlinear optics. For example, these microresonators have shown potential in nanoparticle sizing and counting, as well as enhancing the single-photon optomechanical coupling rate of stimulated Brillouin scattering. However, it has been observed that the relation between the mode linewidth and on-resonance transmission of the split supermodes differs obviously from that of the non-split modes. This behavior is typically quantified by the coupling ideality(I), which remains inadequately explored for the standing-wave supermodes. In this study, we theoretically and experimentally investigate the coupling ideality of standing-wave supermodes in a commonly employed configuration involving a Si O2microresonator side-coupled to a tapered fiber. Our findings demonstrate that, even with a single-mode tapered fiber, the coupling ideality of the standing-wave supermodes is limited to 0.5, due to the strong backscattering-induced energy loss into the counter-propagating direction, resulting in an additional equivalent parasitic loss. While achieving a coupling ideality of 0.5 presents challenges for reaching over-coupled regimes,it offers a convenient approach for adjusting the total linewidth of the modes while maintaining critically-coupled conditions.

关键词： Optical filters Rayleigh scattering Single mode fibers Stimulated Brillouin scattering Tapered fibers Waveguide modes

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Submilliwatt, widely tunable coherent microcomb generation with feedback-free operation

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Advanced Photonics 2023年第3期5卷 144-154页

作者： Haowen Shu Lin Chang chenghao lao Bitao Shen Weiqiang Xie Xuguang Zhang Ming Jin Yuansheng Tao Ruixuan Chen Zihan Tao Huajin Chang Shaohua Yu Qifan Yang Xingjun Wang John E.Bowers Peking University School of ElectronicsState Key Laboratory of Advanced Optical Communication Systems and NetworksBeijingChina University of California Santa BarbaraDepartment of Electrical and Computer EngineeringSanta BarbaraCaliforniaUnited States Peking University School of PhysicsState Key Laboratory for Artificial Microstructure and Mesoscopic PhysicsBeijingChina Peng Cheng Laboratory ShenzhenChina Peking University Frontiers Science Center for Nano-OptoelectronicsBeijingChina

Microcombs are revolutionizing optoelectronics by providing parallel, mutually coherent wavelengthchannels for time-frequency metrology and information processing. To implement this essential function inintegrated photonic systems, it is desirable to drive microcombs directly with an on-chip laser in a simpleand flexible way. However, two major difficulties have prevented this goal: (1) generating mode-lockedcomb states usually requires a significant amount of pump power and (2) the requirement to align laser andresonator frequency significantly complicates operation and limits the tunability of the comb lines. Here, weaddress these problems by using microresonators on an AlGaAs on-insulator platform to generate dark-pulsemicrocombs. This highly nonlinear platform dramatically relaxes fabrication requirements and leads to arecord-low pump power of <1 mW for coherent comb generation. Dark-pulse microcombs facilitated bythermally controlled avoided mode crossings are accessed by direct distributed feedback laser *** any feedback or control circuitries, the comb shows good coherence and stability. With around150 mW on-chip power, this approach also leads to an unprecedentedly wide tuning range of over one freespectral range (97.5 GHz). Our work provides a route to realize power-efficient, simple, and reconfigurablemicrocombs that can be seamlessly integrated with a wide range of photonic systems.

关键词： dark-pulse microcomb direct pumping scheme widely tunable source

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基于单片机的电容测量电路设计仿真及实现

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现代工业经济和信息化 2024年第2期14卷 85-88页

作者：吴燕婷李自成何超邓成浩刘其东文嘉骏甘烙王毅鸿成都理工大学工程技术学院四川成都610059

为研究更优质的电容设计方法,采用了Proteus、STC89C51RD+、NE555时基芯片对电容的设计进行试验和仿真,并将数值计算和试验仿真结果作对比。研究结果表明:使用STC89C516RD+处理器作为主芯片的效果最好,因此在研究电容设计问题时可以优... 详细信息

为研究更优质的电容设计方法,采用了Proteus、STC89C51RD+、NE555时基芯片对电容的设计进行试验和仿真,并将数值计算和试验仿真结果作对比。研究结果表明:使用STC89C516RD+处理器作为主芯片的效果最好,因此在研究电容设计问题时可以优先考虑使用STC89C516RD+处理器,但需注意串并联后电流以及耐压值的大小。

关键词：单片机电容 NE555 Proteus

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SLM成形参数对18Ni-300模具钢致密度的影响

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激光与光电子学进展 2022年第17期59卷 282-288页

作者：吴仔洋孙振忠王皓亮宋成浩劳长石林路平东莞理工学院机械工程学院广东东莞523808 深圳大学机电与控制工程学院广东深圳518061

为研究选区激光熔融(SLM)技术成形试样的工艺参数对试样致密度及微观孔洞的影响规律,设计了正交试验方案对SLM成形的18Ni-300马氏体时效钢进行分析和讨论。从SLM成形工艺参数的三个维度(激光功率、扫描速度和扫描间距)出发,基于灰度理... 详细信息

为研究选区激光熔融(SLM)技术成形试样的工艺参数对试样致密度及微观孔洞的影响规律,设计了正交试验方案对SLM成形的18Ni-300马氏体时效钢进行分析和讨论。从SLM成形工艺参数的三个维度(激光功率、扫描速度和扫描间距)出发,基于灰度理论研究了成形件的致密度,得到致密度与体能量密度的对应关系,并对材料的微观孔洞进行分析。结果表明:当体能量密度在30~50 J/mm^(3)时,材料致密度偏低,且在该范围内提高体能量密度能极大提升材料的致密度,将体能量密度保持在50~150 J/mm^(3)能得到较高致密度的试样;随着致密度的提升,试样内部的孔洞逐渐变小,形状也变得规则,当致密度达到99%后,会得到形状规则的微小孔洞;改变工艺参数范围可以得到合适致密度的试样。

关键词：材料 18Ni-300马氏体时效钢致密度能量密度微观孔洞

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