A5101497069- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Mechanical and Optical Resonators
- Laser-Matter Interactions and Applications
- Semiconductor Lasers and Optical Devices
- Optical Network Technologies
- Nonlinear Partial Differential Equations
- Advanced Fiber Optic Sensors
- Advancements in PLL and VCO Technologies
- Photorefractive and Nonlinear Optics
- Quantum Mechanics and Non-Hermitian Physics
- Advanced Optical Sensing Technologies
- Neural Networks and Reservoir Computing
- Laser Design and Applications
- Geometric Analysis and Curvature Flows
- Nonlinear Photonic Systems
- Advanced Photonic Communication Systems
- Quantum Information and Cryptography
- Organic Electronics and Photovoltaics
- Reservoir Engineering and Simulation Methods
- Quantum Mechanics and Applications
- Digital Holography and Microscopy
- Music and Audio Processing
- Photonic Crystal and Fiber Optics
- Speech and Audio Processing
Stanford University
2023-2025
North Minzu University
2023-2025
Jilin Medical University
2025
Xidian University
2023-2025
Jilin University
2025
The Ohio State University
2022-2024
University of California, Santa Barbara
2023-2024
Peking University
2014-2024
Beijing Normal University
2023-2024
Hqphotonics (United States)
2024
For its many useful properties, including second and third-order optical nonlinearity as well electro-optic control, lithium niobate is considered an important potential microcomb material. Here, a soliton demonstrated in monolithic high-Q resonator. Besides the demonstration of mode locking, photorefractive effect enables locking to self-start switching occur bi-directionally. Second-harmonic generation spectrum also observed, essential step for comb self-referencing. The Raman shock time...
Chirality is an important concept that describes the asymmetry property of a system, which usually emerges spontaneously due to mirror symmetry breaking. Such spontaneous chirality manifests predominantly as parity breaking in modern physics, has been studied extensively, for instance, Higgs double-well Bose-Einstein condensates, topological insulators and superconductors. In optical domain, chiral elusive experimentally, especially micro- nano-photonics demands multiple identical...
Abstract Exceptional points are singularities of open systems, and among their many remarkable properties, they provide a way to enhance the responsivity sensors. Here we show that improved laser gyroscope caused by operation near an exceptional point is precisely compensated increasing noise. The noise, fundamental origin, enhanced because mode spectrum loses oft-assumed property orthogonality. This occurs as system eigenvectors coalesce bi-orthogonal analysis confirms experimental...
Silicon nitride (SiN) waveguides with ultra-low optical loss enable integrated photonic applications including low noise, narrow linewidth lasers, chip-scale nonlinear photonics, and microwave photonics. Lasers are key components to SiN circuits (PICs), but difficult fully integrate low-index due their large mismatch the high-index III-V gain materials. The recent demonstration of multilayer heterogeneous integration provides a practical solution enabled first-generation lasers waveguides....
Integrated photonics has profoundly affected a wide range of technologies underpinning modern society
Photonic integrated circuits are widely used in applications such as telecommunications and data-centre interconnects1-5. However, optical systems microwave synthesizers6, gyroscopes7 atomic clocks8, photonic still considered inferior solutions despite their advantages size, weight, power consumption cost. Such high-precision highly coherent favour ultralow-noise laser sources to be with other components a compact robustly aligned format-that is, on single chip-for replace bulk optics...
The development of integrated semiconductor lasers has miniaturized traditional bulky laser systems, enabling a wide range photonic applications. A progression from pure III-V based to III-V/external cavity structures harnessed low-loss waveguides in different material leading significant improvements coherence and stability. Despite these successes, however, key functions remain absent. In this work, we address critical missing function by integrating the Pockels effect into laser. Using...
Determination of laser frequency with high resolution under continuous and abrupt tuning conditions is important for sensing, spectroscopy, communications. We show that a single microresonator provides rapid broadband measurement optical frequencies relative precision comparable to conventional dual-frequency comb systems. Dual-locked counterpropagating solitons having slightly different repetition rates were used implement vernier spectrometer, which enabled characterization as 10 terahertz...
Since its invention, optical frequency comb has revolutionized a broad range of subjects from metrology to spectroscopy. The recent development microresonator-based combs (microcombs) provides unique pathway create systems on chip. Indeed, microcomb-based spectroscopy, ranging, synthesizer, telecommunications and astronomical calibrations have been reported recently. Critical many the integrated is coverage spectra. Here, microcombs more than two-octave span (450 nm 2,008 nm) demonstrated...
We self-injection-lock a diode laser to 1.41 m long, ultra-high Q integrated resonator. The hybrid reaches frequency noise floor of 0.006Hz2/Hz at 4 MHz offset, corresponding Lorentzian linewidth below 40 mHz-a record among semiconductor lasers. It also exhibits exceptional stability low-offset frequencies, with 200Hz2/Hz 100 Hz offset. Such performance, realized in system comprised entirely photonic chips, marks milestone the development photonics; and, for first time, best our knowledge,...
High optical quality (Q) factors are critically important in microcavities, where performance applications spanning nonlinear optics to cavity quantum electrodynamics is determined. Here, a record Q factor of over 1.1 billion demonstrated for on-chip resonators. Using silica whispering-gallery resonators on silicon, Q-factor data measured wavelengths the C/L bands (100 nm) and range resonator sizes mode families. A low sub-milliwatt parametric oscillation threshold also 9 GHz...
Abstract Dual-comb spectroscopy (DCS) offers high sensitivity and wide spectral coverage without the need for bulky spectrometers or mechanical moving parts. And DCS in mid-infrared (mid-IR) is of keen interest because inherently strong molecular spectroscopic signatures these bands. We report GHz-resolution mid-IR methane ethane that derived from counter-propagating (CP) soliton microcombs combination with interleaved difference frequency generation. Because all four combs required to...
Abstract Optical microresonators with high quality ( Q ) factors are essential to a wide range of integrated photonic devices. Steady efforts have been directed towards increasing microresonator across variety platforms. With success in reducing microfabrication process-related optical loss as limitation , the ultimate attainable determined solely by constituent material absorption, has come into focus. Here, we report measurements material-limited several High- fabricated from thin films...
Temporal soliton mode locking in coherently pumped microcavities is a promising route towards miniaturized frequency comb systems. However, the power efficiency of resulting microcombs usually quite low. Soliton generation by pulse pumping provides way to increase conversion (so far, as high 8%). Here, we study and report single-soliton 54% using scanning laser, well steady-state 34%. We use Lagrangian approach develop analytical expressions for temporal placement within pulse, our...
The goal of self-supervised learning (SSL) for automatic speech recognition (ASR) is to learn good representations from a large amount unlabeled the downstream ASR task. However, most SSL frameworks do not consider noise robustness which crucial real-world applications. In this paper we propose wav2vec-Switch, method encode into contextualized via contrastive learning. Specifically, feed original-noisy pairs simultaneously wav2vec 2.0 network. addition existing task, switch quantized...
Abstract High‐coherence visible and near‐visible laser sources are centrally important to the operation of advanced position/navigation/timing systems as well classical/quantum sensing systems. However, complexity size these bench‐top lasers an impediment their transition beyond laboratory. Here, a system‐on‐chip that emits high‐coherence lightwaves is demonstrated. The devices rely upon new approach wherein wavelength conversion coherence increase by self‐injection locking combined within...
Frequency-modulated (FM) laser combs, which offer a quasi-continuous-wave output and flat-topped optical spectrum, are emerging as promising solution for wavelength-division multiplexing applications, precision metrology, ultrafast ranging. The generation of FM combs relies on spatial hole burning, group velocity dispersion, Kerr nonlinearity, four-wave mixing (FWM). While have been widely observed in quantum cascade Fabry-Perot (FP) lasers, the requirement low-dispersion FP cavity can be...
Normal group velocity dispersion (GVD) microcombs offer high comb line power and pumping efficiency compared to bright pulse microcombs. The recent demonstration of normal GVD using CMOS foundry-produced microresonators is an important step toward scalable production. However, the chromatic devices large impairs generation broadband Here, we report development a microresonator in which reduced due coupled-ring resonator configuration. Operating turnkey self-injection locking mode, integrated...
Abstract Ultralow-noise laser sources are crucial for a variety of applications, including microwave synthesizers, optical gyroscopes and the manipulation quantum systems. Silicon photonics has emerged as promising solution high-coherence applications due to its ability reduce system size, weight, power consumption cost. Semiconductor lasers based on self-injection locking have achieved fibre coherence, but typically require high-quality-factor external cavity suppress coherence collapse...