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Hydrodynamical self-interference of a scattered polariton quanta

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Light(Science & Applications) 2020年第1期9卷 541-542页

作者： Jiahui Huang wei Liu chee wei wong Mesoscopic Optics and Quantum Electronics Laboratory University of CaliforniaLos AngelesCA 90095USA

Researchers have observed the free-propagation of a single microcavity polariton directly and its self-interference when scattering upon a *** experimental observations of quantum hydrodynamics in the single polariton limit test the wave-particle duality and aid in the development of polariton-based photonic circuits in quantum information processing.

关键词： defect polar quantum

Real-time transition dynamics and stability of chipscale dispersion-managed frequency microcombs

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Light(Science & Applications) 2020年第1期9卷 1520-1529页

作者： Yongnan Li Shu-wei Huang Bowen Li Hao Liu Jinghui Yang Abhinav Kumar Vinod Ke Wang Mingbin Yu Dim-Lee Kwong Hui-Tian Wang Kenneth Kin-Yip wong chee wei wong Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory University of CaliforniaLos AngelesCA 90095USA School of Physics and The MOE Key Laboratory of Weak Light Nonlinear Photonics Nankai UniversityTianjinChina Department of Electrical Computer and Energy EngineeringUniversity of Colorado BoulderBoulderCO 80309USA Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina Institute of Microelectronics A*STARSingapore 117865Singapore

Femtosecond mode-locked laser frequency combs have served as the cornerstone in precision spectroscopy,alloptical atomic clocks,and measurements of ultrafast *** frequency microcombs based on nonlinear microresonators have been examined,exhibiting remarkable precision approaching that of laser frequency combs,on a solid-state chip-scale platform and from a fundamentally different physical *** recent successes,to date,the real-time dynamical origins and high-power stabilities of such frequency microcombs have not been fully ***,we unravel the transitional dynamics of frequency microcombs from chaotic background routes to femtosecond mode-locking in real time,enabled by our ultrafast temporal magnifier metrology and improved stability of dispersion-managed dissipative *** our dispersion-managed oscillator,we further report a stability zone that is more than an order-of-magnitude larger than its prior static homogeneous counterparts,providing a novel platform for understanding ultrafast dissipative dynamics and offering a new path towards high-power frequency microcombs.

关键词： dispersion stability dynamics

Towards optimum Franson interference recurrence in mode-locked singly-filtered biphoton frequency combs

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光子学研究:英文版 2023年第7期11卷 1175-1184页

作者： KAI-CHI CHANG XIANG CHENG MURAT CAN SARIHAN chee wei wong Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory Department of Electrical and Computer EngineeringUniversity of CaliforniaLos AngelesCalifornia 90095USA

Mode-locked biphoton frequency combs exhibit multiple discrete comblike temporal correlations from the Fourier transform of its phase-coherent frequency *** temporal correlation and Franson interferometry are valuable tools for analyzing the joint properties of biphoton frequency combs,and the latter has proven to be essential for testing the fundamental quantum nature,the time-energy entanglement distribution,and the large-alphabet quantum key ***,the Franson recurrence interference visibility in biphoton frequency combs unavoidably experiences a falloff that deteriorates the quality of time-energy entanglement and channel capacity for longer cavity round *** this paper,we provide a new method to address this problem towards optimum Franson interference *** first observe mode-locked temporal oscillations in a5.03 GHz free-spectral range singly filtered biphoton frequency comb using only commercial ***,we observe similar falloff trend of time-energy entanglement in 15.15 GHz and 5.03 GHz free-spectral range singly filtered biphoton frequency combs,whereas,the optimum central time-bin accidental-subtracted visibility over 97%for both ***,we find that by increasing the cavity finesse F,we can enhance the detection probability in temporal correlations and towards optimum Franson interference recurrence in our singly filtered biphoton frequency *** the first time,via a higher cavity finesse F of 45.92 with a 15.11 GHz free-spectral range singly filtered biphoton frequency comb,we present an experimental≈3.13-fold improvement of the Franson visibility compared to the Franson visibility with a cavity finesse F of 11.14 at the sixth time *** optimum Franson interference recurrence and a time-bin Schmidt number near 16 effective modes in similar free-spectral range cavity are predicted with a finesse F of *** configuration is versatile and robust against changes in cavity parameters that can be d

关键词： optimum filtered visibility

Stimulated generation of deterministic platicon frequency microcombs

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Photonics Research 2022年第8期10卷 1877-1885页

作者： HAO LIU SHU-wei HUANG WENTING WANG JINGHUI YANG MINGBIN YU DIM-LEE Kwong PIERRE COLMAN chee wei wong Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory University of California Los AngelesLos AngelesCalifornia 90095USA Department of Electrical Computerand Energy EngineeringUniversity of Colorado BoulderBoulderColorado 80309USA Institute of Microelectronics SingaporeSingapore Universitéde Bourgogne Franche-Comté ICBUMR CNRS 6303DijonFrance

Dissipative Kerr soliton generation in chip-scale nonlinear resonators has recently observed remarkable advances,spanning from massively parallel communications, to self-referenced oscillators, and to dual-comb *** working in the anomalous dispersion regime, unique driving protocols and dispersion in these nonlinear resonators have been examined to achieve the soliton and soliton-like temporal pulse shapes and coherent frequency comb generation. The normal dispersion regime provides a complementary approach to bridge the nonlinear dynamical studies, including the possibility of square pulse formation with flattop plateaus, or *** we report observations of square pulse formation in chip-scale frequency combs through stimulated pumping at one free spectral range and in silicon nitride rings with +55 fs~2∕mm normal group velocity *** of the platicon frequency comb via a varied sideband modulation frequency is examined in both spectral and temporal measurements. Determined by second-harmonic autocorrelation and cross correlation, we observe bright square platicon pulse of 17 ps pulse width on a 19 GHz flat frequency comb. With auxiliary-laser-assisted thermal stabilization, we surpass the thermal bistable dragging and extend the mode-locking access to narrower 2 ps platicon pulse states, supported by nonlinear dynamical modeling and boundary limit discussions.

关键词： pumping soliton dispersion

Probing 10μK stability and residual drifts in the cross-polarized dual-mode stabilization of single-crystal ultrahigh-Q optical resonators

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Light(Science & Applications) 2019年第1期8卷 1170-1178页

作者： Jinkang Lim wei Liang Anatoliy A.Savchenkov Andrey B.Matsko Lute Maleki chee wei wong Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory University of CaliforniaLos AngelesCA 90095USA OEwaves Inc. 465 North Halstead StreetSuite 140PasadenaCA 91107USA

The thermal stability of monolithic optical microresonators is essential for many mesoscopic photonic applications such as ultrastable laser oscillators,photonic microwave clocks,and precision navigation and *** fundamental performance is largely bounded by thermal *** thermal monitoring can be achieved by utilizing cross-polarized dual-mode beat frequency metrology,determined by the polarization-dependent thermorefractivity of a single-crystal microresonator,wherein the heterodyne radio-frequency beat pins down the optical mode volume temperature for precision ***,we investigate the correlation between the dualmode beat frequency and the resonator temperature with time and the associated spectral noise of the dual-mode beat frequency in a single-crystal ultrahigh-Q MgF_(2) resonator to illustrate that dual-mode frequency metrology can potentially be utilized for resonator temperature stabilization reaching the fundamental thermal noise limit in a realistic *** show a resonator long-term temperature stability of 8.53μK after stabilization and unveil various sources that hinder the stability from reaching sub-μK in the current system,an important step towards compact precision navigation,sensing,and frequency reference architectures.

关键词： resonator polarization stabilization

Soliton bursts and deterministic dissipative Kerr soliton generation in auxiliary-assisted microcavities

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Light(Science & Applications) 2019年第1期8卷 739-748页

作者： Heng Zhou Yong Geng Wenwen Cui Shu-wei Huang Qiang Zhou Kun Qiu chee wei wong Key Lab of Optical Fiber Sensing and Communication Networks University of Electronic Science and Technology of China611731 ChengduChina Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory University of CaliforniaLos AngelesCA 90095USA Department of Electrical Computerand Energy EngineeringUniversity of ColoradoBoulderCO 80309USA Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China611731 ChengduChina

Dissipative Kerr solitons in resonant frequency combs offer a promising route for ultrafast mode-locking,precision spectroscopy and time-frequency *** dynamics for the dissipative soliton generation,however,are intrinsically intertwined with thermal nonlinearities,limiting the soliton generation parameter map and statistical success probabilities of the solitary ***,via use of an auxiliary laser heating approach to suppress thermal dragging dynamics in dissipative soliton comb formation,we demonstrate stable Kerr soliton singlet formation and soliton ***,we access a new soliton existence range with an inverse-sloped Kerr soliton evolution—diminishing soliton energy with increasing pump ***,we achieve deterministic transitions from Turinglike comb patterns directly into the dissipative Kerr soliton singlet pulse bypassing the chaotic *** is achieved by avoiding subcomb overlaps at lower pump power,with near-identical singlet soliton comb generation over twenty ***,with the red-detuned pump entrance route enabled,we uncover unique spontaneous soliton bursts in the direct formation of low-noise optical frequency combs from continuum background *** burst dynamics are due to the rapid entry and mutual attraction of the pump laser into the cavity mode,aided by the auxiliary laser and matching well with our numerical *** by the auxiliary-assisted frequency comb dynamics,we demonstrate an application of automatic soliton comb recovery and long-term stabilization against strong external *** findings hold potential to expand the parameter space for ultrafast nonlinear dynamics and precision optical frequency comb stabilization.

关键词： soliton auxiliary dissipative

Measurement of sub-fm/Hz^(1/2) displacement spectral densities in ultrahigh-Q single-crystal microcavities with hertz-level lasers

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Photonics Research 2022年第5期10卷 1202-1209页

作者： YOON-SOO JANG JINKANG LIM WENTING WANG SEUNG-WOO KIM ANATOLIY SAVCHENKOV ANDREY BMATSKO chee wei wong Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory University of CaliforniaLos AngelesCalifornia 90095USA Division of Physical Metrology Korea Research Institute of Standards and Science(KRISS)Daejeon 34113Republic of Korea CACI-LGS Labs Florham ParkNew Jersey 07932USA Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea OEwaves Inc. PasadenaCalifornia 91107USA Jet Propulsion Laboratory California Institute of TechnologyPasadenaCalifornia 91109USA

Tracing a resonance frequency of a high quality factor(Q)optical cavity facilitates subpicometer displacement measurements of the optical cavity via Pound-Drever-Hall(PDH)locking scheme,tightly synchronizing a laser frequency to the optical *** we present observations of subfemtometer displacements on a ultrahigh-Q single-crystal MgF_(2)whispering-gallery-mode microcavity by frequency synchronization between a 1 Hz cavity-stabilized laser and a resonance of the MgF_(2) cavity using PDH laser-cavity *** characterize not only the displacement spectral density of the microcavity with a sensitivity of 1.5×10^(-16) m/Hz^(1/2) over the Fourier offset frequency ranging from 15 mHz to 100 kHz but also a 1.77 nm displacement fluctuation of the microcavity over 4500 *** measurement capability not only supports the analysis of integrated thermodynamical and technical cavity noise but allows for minute displacement measurements using laser-cavity locking for ultraprecise positioning,metrology,and sensing.

关键词： synchronization displacement cavity

Extreme events in quantum cascade lasers

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Advanced Photonics 2020年第6期2卷 57-68页

作者： Olivier Spitz Jiagui Wu Andreas Herdt Grégory Maisons Mathieu Carras Wolfgang Elsäßer chee-wei wong Frédéric Grillot LTCI Télécom ParisInstitut Polytechnique de ParisPalaiseauFrance mirSense Centre d’Intégration NanoInnovPalaiseauFrance University of California Los Angeles Fang Lu Mesoscopic Optics and Quantum Electronics LaboratoryLos AngelesCaliforniaUnited States Southwest University College of Electronic and Information EngineeringChongqingChina Technische Universität Darmstadt DarmstadtGermany University of New Mexico Center for High Technology MaterialsAlbuquerqueNew MexicoUnited States

We demonstrate experimentally that mid-infrared quantum cascade lasers(QCLs)operating under external optical feedback exhibit extreme *** events can be triggered by adding small amplitude periodic modulation,with the highest success rate for the case of a pulse-up *** findings broaden the potential applications for QCLs,which have already been proven to be a semiconductor laser of interest for spectroscopic applications and countermeasure *** ability to trigger extreme events paves the way for optical neuron-like systems where information propagates as a result of high intensity bursts.

关键词： extreme pulses quantum cascade lasers nonlinear dynamics mid-infrared photonics

Effect of pipe installation and external load on buried steel pipe responses:Experimental and numerical investigations

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Underground Space 2024年第2期15卷 44-58页

作者： Yadong Zhang Ron Chik-Kwong wong Jianfeng Chen wei Su Department of Civil Engineering Schulich School of EngineeringUniversity of CalgaryCalgaryAB T2N 1N4Canada Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China

During pipe installation,compacting soil at pipe sides causes an initial pipe deformation which is known as the"peaking"***,in conventional pipe design codes,only pipe deformation caused by vertical overburden is considered while the"peaking"effect is *** this study,a full-scale test was conducted on a Grade X52 steel pipe with a diameter of 600 mm to investigate the impacts of both soil compaction and vertical overburden on pipe *** compaction and external load were found to elongate and shorten the vertical pipe diameter,***"peaking"effect was observed during the installation procedure accompanied by the highest pipe stress measured at the pipe ***,a two-dimensional finite element model was created and validated based on the calculated pipe stresses from the experimental study.A parametric study was performed thereafter to numerically study the impacts of soil water content,pipe wall thickness,compaction pressure,and lift thickness on pipe responses due to soil compaction and external *** increase in the"peaking"effect is observed with increasing soil water content and compaction pressure,while an increase in pipe wall thickness or lift thickness would cause a decrease in the"peaking"effect.

关键词： X52 steel Soil compaction External load Peaking effect Pipe deflection Soil arching