180 citations · 896 across the 16 of their papers we have counts for
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Self-injection-locked optical parametric oscillator based on microcombs
Fuchuan Lei, Yi Sun, Óskar B. Helgason +5
Narrow-linewidth yet tunable laser oscillators are one of the most important tools for precision metrology, optical atomic clocks, sensing and quantum computing. Commonly used tuna…
Vernier Microcombs for Integrated Optical Atomic Clocks
Kaiyi Wu, Nathan P. O'Malley, Saleha Fatema +8
CMOS-compatible Kerr microcombs have drawn substantial interest as mass-manufacturable, compact alternatives to bulk frequency combs. This could enable deployment of many comb-reli…
Ultraviolet astronomical spectrograph calibration with laser frequency combs from nanophotonic lithium niobate waveguides
Markus Ludwig, Furkan Ayhan, Tobias M. Schmidt +21
Astronomical precision spectroscopy underpins searches for life beyond Earth, direct observation of the expanding Universe and constraining the potential variability of physical co…
A wideband, high-resolution vector spectrum analyzer for integrated photonics
Yi-Han Luo, Baoqi Shi, Wei Sun +8
The analysis of optical spectra - emission or absorption -- has been arguably the most powerful approach for discovering and understanding matters. The invention and development of…
Foundry manufacturing of tight-confinement, dispersion-engineered, ultralow-loss silicon nitride photonic integrated circuit
Zhichao Ye, Haiyan Jia, Zhangjun Huang +9
The foundry development of integrated photonics has revolutionized today's optical interconnect and datacenters. Over the last decade, we have witnessed the rising of silicon nitri…
Compact lithium niobate photonic integrated circuits
Yan Gao, Fuchuan Lei, Marcello Girardi +4
Lithium niobate (LN) is a promising material for future complex photonic-electronic circuits, with wide applications in fields like communications, sensing, quantum optics, and com…
Differential phase reconstruction of microcombs
Krishna Twayana, Fuchuan Lei, Zhichao Ye +4
Measuring microcombs in amplitude and phase provides unique insight into the nonlinear cavity dynamics but spectral phase measurements are experimentally challenging. Here, we repo…
Hyperparametric oscillation via bound states in the continuum
Fuchuan Lei, Zhichao Ye, Krishna Twayana +5
Optical hyperparametric oscillation based on the third-order nonlinearity is one of the most significant mechanisms to generate coherent electromagnetic radiation and produce quant…
Power-efficient soliton microcombs
Óskar B. Helgason, Marcello Girardi, Zhichao Ye +3
Laser frequency combs are enabling some of the most exciting scientific endeavours in the 21st century, ranging from the development of optical clocks to the calibration of the ast…
Thermal noise reduction in soliton microcombs via laser self-cooling
Fuchuan Lei, Zhichao Ye, Victor Torres-Company
Thermal noise usually dominates the low-frequency region of the optical phase noise of soliton microcombs, leading to decoherence and limiting many aspects of applications. In this…
Integrated, ultra-compact high-Q silicon nitride microresonators for low-repetition-rate soliton microcombs
Zhichao Ye, Fuchuan Lei, Krishna Twayana +3
Multiple applications of relevance in photonics, such as spectrally efficient coherent communications, microwave synthesis or the calibration of astronomical spectrographs, would b…
Overcoming the quantum limit of optical amplification in monolithic waveguides
Zhichao Ye, Ping Zhao, Krishna Twayana +3
Optical amplifiers are essential in numerous photonic applications. Parametric amplifiers, relying on a nonlinear material to create amplification, are uniquely promising as they c…
Optical linewidth of soliton microcombs
Fuchuan Lei, Zhichao Ye, Óskar B. Helgason +3
Soliton microcombs provide a versatile platform for realizing fundamental studies and technological applications. To be utilized as frequency rulers for precision metrology, solito…
Dissipative Kerr solitons in photonic molecules
Óskar B. Helgason, Francisco R. Arteaga-Sierra, Zhichao Ye +5
Many physical systems display quantized energy states. In optics, interacting resonant cavities show a transmission spectrum with split eigenfrequencies, similar to the split energ…
High-Q Si3N4 microresonators based on a subtractive processing for Kerr nonlinear optics
Zhichao Ye, Krishna Twayana, Peter A. Andrekson +1
Microresonator frequency combs (microcombs) are enabling new applications in frequency synthesis and metrology from high-speed laser ranging to coherent optical communications. One…
Optical bandgap engineering in nonlinear silicon nitride waveguides
Clemens J. Krückel, Attila Fülöp, Zhichao Ye +2
Silicon nitride is awell-established material for photonic devices and integrated circuits. It displays a broad transparency window spanning from the visible to the mid-IR and wave…