A5072976480- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Photorefractive and Nonlinear Optics
- Optical Network Technologies
- Advanced Photonic Communication Systems
- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Laser-Matter Interactions and Applications
- Photonic Crystal and Fiber Optics
- Semiconductor Lasers and Optical Devices
- Mechanical and Optical Resonators
- Advanced Optical Network Technologies
- Advanced Fiber Optic Sensors
- Advanced Optical Sensing Technologies
- Solid State Laser Technologies
- graph theory and CDMA systems
- Neural Networks and Reservoir Computing
- Quantum Computing Algorithms and Architecture
- Nonlinear Dynamics and Pattern Formation
- Coding theory and cryptography
- Orbital Angular Momentum in Optics
- Nonlinear Photonic Systems
- Spectroscopy and Laser Applications
- Semiconductor Quantum Structures and Devices
- Terahertz technology and applications
Stanford University
2015-2024
Oak Ridge National Laboratory
2016
Purdue University West Lafayette
2016
University of Southern California
2009-2014
Stanford Medicine
2011
National Institute of Informatics
2010
Southern California University for Professional Studies
2009
Unconventional, special-purpose machines may aid in accelerating the solution of some hardest problems computing, such as large-scale combinatorial optimizations, by exploiting different operating mechanisms than those standard digital computers. We present a scalable optical processor with electronic feedback that can be realized at large scale room-temperature technology. Our prototype machine is able to find exact solutions of, or sample good approximate to, variety hard instances Ising...
Periodically poled lithium niobate (PPLN) waveguide is a powerful platform for efficient wavelength conversion. Conventional PPLN converters however typically require long device lengths and high pump powers due to the limited nonlinear interaction strength. Here we use nanostructured waveguides demonstrate an ultrahigh normalized efficiency of 2600%/W-cm$^2$ second-harmonic generation 1.5-$\mu$m radiation, more than 20 times higher that in state-of-the-art diffused waveguides. This achieved...
Benchmarking the coherent Ising machine and D-Wave quantum annealer sheds light on importance of connectivity.
Quasi-phase-matched interactions in waveguides with quadratic nonlinearities enable highly efficient nonlinear frequency conversion. In this paper, we demonstrate the first generation of devices that combine dispersion engineering available nanophotonic quasi-phase-matched periodically poled lithium niobate (PPLN). This combination enables quasi-static femtosecond pulses, reducing pulse energy requirements by several orders magnitude compared to conventional devices, from picojoules...
Second-order nonlinear optical processes convert light from one wavelength to another and generate quantum entanglement. Creating chip-scale devices efficiently control these interactions greatly increases the reach of photonics. Existing silicon-based photonic circuits utilize third-order nonlinearity, but an analogous integrated platform for second-order optics remains outstanding challenge. Here we demonstrate efficient frequency doubling parametric oscillation with a threshold tens...
Practical quantum networks require interfacing memories with existing channels and systems that operate in the telecom band. Here we demonstrate low-noise, bidirectional frequency conversion enables a solid-state memory to directly interface telecom-band systems. In particular, of visible-band single photons emitted from silicon-vacancy (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><a:mi>Si</a:mi></a:math><d:math...
Conventional single-photon detectors at communication wavelengths suffer from low quantum efficiencies and large dark counts. We present a detection system, operating wavelengths, based on guided-wave frequency upconversion in nonlinear crystal with an overall system efficiency (upconversion + detection) exceeding 46% 1.56 microm. This consists of fiber-pigtailed reverse-proton-exchanged periodically poled LiNbO3 waveguide device conjunction silicon-based counting module.
The authors present a review of all-optical signal-processing technologies based on /spl chi//sup (2)/ nonlinear interactions in guided-wave devices and their applications for telecommunication. In this study, the main focus is three-wave annealed proton-exchanged periodically poled lithium niobate waveguides due to suitable properties with respect mixing efficiency, propagation loss, ease fabrication. These allow implementation advanced functions next-generation networks signal bandwidths...
We demonstrate upconversion-assisted single-photon detection for the 1.55-μm telecommunications band based on a periodically poled lithium niobate (PPLN) waveguide pumped by monolithic PPLN optical parametric oscillator. achieve an internal conversion efficiency of 86%, which results in overall system 37%, with excess noise as low 10(3) counts s(-1). measure dark count rate versus upconversion pump-signal frequency separation and find to be consistent photon generation spontaneous...
We present a device to facilitate single-photon detection at communication wavelengths based on continuous-wave sum-frequency generation with an upconversion efficiency exceeding 90%. Sum-frequency in periodically poled lithium niobate waveguide is used upconvert signal photons the near infrared, where can be performed efficiently by use of silicon avalanche photodiodes.
We demonstrate self-referencing of a Tm-doped fiber oscillator-amplifier system by performing octave-spanning supercontinuum generation in periodically poled lithium niobate waveguide. model the numerically and show good agreement with experiment.
High-gain optical parametric amplification is an important nonlinear process used both as a source of coherent infrared light and nonclassical light. In this work, we experimentally demonstrate approach to that enables extremely large gains with low energy requirements. conventional media driven by femtosecond pulses, multiple dispersion orders limit the effective interaction length available for amplification. Here, use engineering in periodically poled thin-film lithium niobate...
Mid-infrared spectroscopy, an important technique for sensing molecules, has encountered barriers from sources either limited in tuning range or excessively bulky widespread use. We present a compact, efficient, and broadly tunable optical parametric oscillator surmounting these challenges. Leveraging dispersion-engineered thin-film lithium niobate-on-sapphire photonics singly resonant cavity allows broad, controlled over octave 1.5–3.3 µm. The device generates >25mW of mid-infrared light...
We describe techniques for making sensitive and high-dynamic-range measurements of laser amplitude envelope phase noise (timing jitter) in the frequency domain at shot-noise limit. Examples on continuous-wave argon-ion diode-pumped solid-state lasers used pumping a femtosecond Ti:sapphire are presented. Amplitude also presented, showing correlation between pump modulation (AM) spectra resulting AM noise. Characteristics measurement system components discussed, along with examples impact...
We report a quantum key distribution experiment based on the differential phase shift keying (DPSK) protocol with Poissonian photon source, in which secure keys were generated over >100 km fibre for first time. analysed security of DPSK and showed that it is robust against strong attacks by Eve, including number splitting attack. To implement this protocol, we developed new detector 1.5 μm band frequency up-conversion periodically poled lithium niobate waveguide followed an Si avalanche...
Ideal quantum frequency conversion (QFC) devices enable wavelength translation of a state light while preserving its essential characteristics, namely photon statistics and coherence. However, the generation noise photons due to spontaneous scattering strong classical pump used in three-wave mixing process can limit QFC fidelity. We experimentally theoretically characterize properties difference-frequency device for find that fabrication errors quasi-phase-matching grating enhance by...
We numerically investigate supercontinuum generation in quasi-phase-matched waveguides using a single-envelope approach to capture second and third order nonlinear processes involved the of octave-spanning spectra. Simulations are shown agree with experimental results reverse-proton-exchanged lithium-niobate waveguides. The competition between χ((2)) χ((3)) self phase modulation effects is discussed. Chirped quasi-phasematched gratings stimulated Raman scattering enhance spectral broadening,...
Harnessing nonlinearities strong enough to allow two single photons interact with one another is not only a fascinating challenge but central numerous advanced applications in quantum information science. Currently, all known approaches are extremely challenging although few have led experimental realisations attenuated classical laser light. This has included cross-phase modulation weak light atomic ensembles and optical fibres, converting incident into non-classical stream of photon or...
We demonstrate a midinfrared source tunable from 6.7 to 12.7 μm via difference frequency generation (DFG) in orientation-patterned GaAs, with 1.3 mW average output power. The input pulses are generated Raman self-frequency shift of femtosecond Tm-doped-fiber laser system fluoride fiber. numerically model the DFG process and show good agreement between simulations experiments. use this numerical an improved design using longer pump pulses.
Quantum frequency conversion (QFC) of photonic signals preserves quantum information while simultaneously changing the signal wavelength. A common application QFC is to translate wavelength a compatible with current fiber-optic infrastructure shorter more high quality single-photon detectors and optical memories. Recent work has investigated use manipulate measure specific temporal modes (TMs) through tailoring pump pulses. Such scheme holds promise for multidimensional state manipulation...
Periodically poled thin-film lithium niobate (TFLN) waveguides have emerged as a leading platform for highly efficient frequency conversion in the near-infrared. However, commonly used silica bottom-cladding results high absorption loss at wavelengths beyond 2.5 µm. In this work, we demonstrate TFLN-on-sapphire platform, which features transparency up to 4.5 particular, report generating mid-infrared light 3.66 µm via difference-frequency generation of fixed 1 source and tunable telecom...
Spectral behaviors of photonic resonators have been the basis for a range fundamental studies, with applications in classical and quantum technologies. Driven nonlinear provide fertile ground phenomena related to phase transitions far from equilibrium, which can open opportunities unattainable their linear counterparts. Here, we show that optical parametric oscillators (OPOs) undergo second-order spectral domain between degenerate non-degenerate regimes. This abrupt change response follows...
Thin-film lithium niobate (TFLN) is an emerging platform for compact, low-power nonlinear-optical devices, and has been used extensively near-infrared frequency conversion. Recent work extended these devices to mid-infrared wavelengths, where broadly tunable sources may be chemical sensing. To this end, we demonstrate efficient broadband difference generation between a fixed 1-micron pump telecom source in uniformly-poled TFLN-on-sapphire by harnessing the dispersion-engineering available...