A5086272281- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Mechanical and Optical Resonators
- Semiconductor Lasers and Optical Devices
- Advanced Photonic Communication Systems
- Laser-Matter Interactions and Applications
- Optical Network Technologies
- Photorefractive and Nonlinear Optics
- Spectroscopy and Laser Applications
- Advanced Fiber Optic Sensors
- Neural Networks and Reservoir Computing
- Cancer Treatment and Pharmacology
- Photonic Crystal and Fiber Optics
- Nonlinear Photonic Systems
- Laser Design and Applications
- Photonic Crystals and Applications
- Advanced Frequency and Time Standards
- Analytical Chemistry and Sensors
- Spanish Literature and Culture Studies
- Acoustic Wave Resonator Technologies
- Gyrotron and Vacuum Electronics Research
- Solid State Laser Technologies
- Force Microscopy Techniques and Applications
- Radiopharmaceutical Chemistry and Applications
- Silicon Nanostructures and Photoluminescence
California Institute of Technology
2019-2025
Harvard University
2018-2019
We control the electronic structure of silicon-vacancy (SiV) color-center in diamond by changing its static strain environment with a nano-electro-mechanical system. This allows deterministic and local tuning SiV optical spin transition frequencies over wide range, an essential step towards multi-qubit networks. In process, we infer Hamiltonian revealing large susceptibilities order 1 PHz/strain for orbital states. identify regimes where spin-orbit interaction results suseptibility 100...
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...
Numerous modern technologies are reliant on the low-phase noise and exquisite timing stability of microwave signals. Substantial progress has been made in field photonics, whereby low-noise signals generated by down-conversion ultrastable optical references using a frequency comb
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...
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,...
Phonons at gigahertz frequencies interact with electrons, photons, and atomic systems in solids, therefore have extensive applications signal processing, sensing, quantum technologies. Surface acoustic wave (SAW) resonators that confine surface phonons can play a crucial role such integrated phononic due to small mode size, low dissipation, efficient electrical transduction. To date, it has been challenging achieve high quality (Q) factor phonon size for SAW frequencies. Here, we present...
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...
Lasers with hertz linewidths at time scales of seconds are critical for metrology, timekeeping, and manipulation quantum systems. Such frequency stability relies on bulk-optic lasers reference cavities, where increased size is leveraged to reduce noise but the trade-off cost, hand assembly, limited applications. Alternatively, planar waveguide-based enjoy complementary metal-oxide semiconductor scalability yet fundamentally from achieving by stochastic thermal sensitivity. In this work, we...
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...
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...
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...
High- Q microresonators are indispensable components of photonic integrated circuits and offer several useful operational modes. However, these modes cannot be reconfigured after fabrication because they fixed by the resonator’s physical geometry. In this work, we propose a Moiré speedup dispersion tuning method that enables microresonator device to operate in any three Electrical Vernier coupled rings switches operating modality Brillouin laser, bright microcomb, dark microcomb operation on...
Abstract Compact, low-noise microwave sources are required throughout a wide range of application areas including frequency metrology, wireless-communications and airborne radar systems. And the photonic generation microwaves using soliton microcombs offers path towards integrated, low noise signal sources. In these devices, so called quiet-point operation has been shown to reduce noise. Such decouples pump from soliton’s motion by balancing Raman self-frequency shift with dispersive-wave...
Visible, high-coherence optical sources are important to a wide range of applications spanning spectroscopy precision timing. Integration these on semiconductor chip is necessary step if the systems that use devices be made compact, portable, and low power. Here, by self-injection-locking 1560 nm distributed feedback laser high-Q silicon-nitride resonator, 780 second-harmonic signal generated via photogalvanic-induced second-order nonlinearity. A record-low frequency noise floor 4Hz 2 /Hz...
With their compact size and semiconductor-chip-based operation, frequency microcombs can be an invaluable light source for gas spectrcoscopy. However, the generation of mid-infrared (mid-IR) combs with gigahertz line spacing as required to resolve many spectra represents a significant challenge these devices. Here, technique referred interleaved difference-frequency (iDFG) is introduced that densifies spectral upon conversion near-IR comb into mid-IR light. A soliton microcomb used both...
We demonstrate that it is possible to linearly tune the repetition rate of a bright soliton comb generated using an Si 3 N 4 microring resonator by varying frequency auxiliary heater laser. Hence, laser can be utilized as linear active feedback element for stabilizing rate. investigated potential actuator at different modulation rates. Within bandwidth laser, we find variation ratio, defined ratio change in frequency, remains unchanged. This also quantifies correlation between drift and...
The linewidth of regenerative oscillators is enhanced by amplitude–phase coupling the oscillator field [ Phys. Rev. 160 , 290 ( 1967 ) ]. In laser oscillators, this effect well known for its impact on semiconductor performance. Here, studied in Brillouin lasers. Because their gain parametric, and enhancement are shown to originate from phase mismatch. theory confirmed measurement a microcavity laser, enhancements as large <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...