A5079302451- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Terahertz technology and applications
- Laser-Matter Interactions and Applications
- Optical Network Technologies
- Random lasers and scattering media
- Nonlinear Photonic Systems
- Photorefractive and Nonlinear Optics
- Semiconductor Lasers and Optical Devices
- Mechanical and Optical Resonators
- Photonic Crystal and Fiber Optics
- Plasmonic and Surface Plasmon Research
- Advanced Fiber Optic Sensors
- Nonlinear Dynamics and Pattern Formation
- Photonic Crystals and Applications
- Spectroscopy and Laser Applications
- Neural Networks and Reservoir Computing
- Solid State Laser Technologies
- Metamaterials and Metasurfaces Applications
- Optical and Acousto-Optic Technologies
- Laser Design and Applications
- Superconducting and THz Device Technology
- Semiconductor Quantum Structures and Devices
- Orbital Angular Momentum in Optics
- Optical Coherence Tomography Applications
University of Sussex
2016-2025
Loughborough University
2022-2025
Applied Photonics (United Kingdom)
2025
Institute for Complex Systems
2022-2023
National Research Council
2022-2023
Photonics (United States)
2021
Institut National de la Recherche Scientifique
2009-2017
University of Nottingham
2016
University of Rome Tor Vergata
2016
Université du Québec à Montréal
2011
The quest towards the integration of ultra-fast, high-precision optical clocks is reflected in large number high-impact papers on topic published last few years. This interest has been catalysed by impact that frequency combs (OFCs) have had metrology and spectroscopy decade [[1], [2], [3], [4], [5]]. OFCs are often referred to as rulers: their spectra consist a precise sequence discrete equally-spaced spectral lines represent marks frequency. Their importance was recognised worldwide with...
We report a novel geometry for OPOs based on nonlinear microcavity resonators. This approach relies self-locked scheme that enables OPO emission without the need thermal locking of pump laser to resonance. By exploiting CMOS-compatible microring resonator, we achieve oscillation with complete absence shutting down, or self-terminating behavior, very common occurrence in externally pumped OPOs. Further, this consistently produces wide bandwidth (>300nm, limited by our experimental set-up)...
We report an integrated photon pair source based on a CMOScompatible microring resonator that generates multiple, simultaneous, and independent pairs at different wavelengths in frequency comb compatible with fiber communication wavelength division multiplexing channels (200 GHz channel separation) linewidth is quantum memories (110 MHz).It operates self-locked pump configuration, avoiding the need for active stabilization, making it extremely robust even very low power levels.
Ultrashort pulsed lasers, operating through the phenomenon of mode-locking, have had a significant role in many facets our society for 50 years, example, way we exchange information, measure and diagnose diseases, process materials, other applications. Recently, high-quality resonators been exploited to demonstrate optical combs. The ability phase-lock their modes would allow mode-locked lasers benefit from high spectral quality, helping realize novel sources such as precision clocks...
We demonstrate a novel mode locked ultrafast laser, based on an integrated high-Q micr-oring resonator. Our scheme exhibits stable operation of two slightly shifted spectral optical comb replicas. It generates highly monochromatic radiofrequency modulation 60MHz 200GHz output pulse train, with linewidth < 10kHz
We demonstrate sub-picosecond wavelength conversion in the C-band via four wave mixing a 45cm long high index doped silica spiral waveguide. achieve an on/off efficiency (signal to idler) of +16.5dB as well parametric gain +15dB for peak pump power 38W over range 100nm. Furthermore, we demonstrated minimum +5dB large 200nm.
Abstract Nonlinear optical processes are one of the most important tools in modern optics with a broad spectrum applications in, for example, frequency conversion, spectroscopy, signal processing and quantum optics. For practical ultimately widespread implementation, on-chip devices compatible electronic integrated circuit technology offer great advantages terms low cost, small footprint, high performance energy consumption. While many key components have been realized, to date polarization...
Recent development in quantum photonics allowed to start the process of bringing photonic-quantum-based systems out lab into real world applications. As an example, devices for exchange a cryptographic key secured by law mechanics are currently commercially available. In order further boost this process, next step is migrate results achieved means bulky and expensive setups miniaturized affordable devices. Integrated exactly addressing issue. paper we briefly review most recent advancements...
Abstract In many disciplines, states that emerge in open systems far from equilibrium are determined by a few global parameters 1,2 . These can often mimic thermodynamic equilibrium, classic example being the oscillation threshold of laser 3 resembles phase transition condensed matter. However, classes cannot form spontaneously dissipative systems, and this is case for cavity solitons 2 generally need to be induced external perturbations, as optical memories 4,5 past decade, these highly...
We present the first system penalty measurements for all-optical wavelength conversion via four wave mixing in an integrated, CMOS compatible, ring resonator, obtaining < 0.3 dB at 2.5Gb/s ~22dBm average pump power.
The paper study the formation of microcomb Turing patterns in a system comprised micro-resonator nested an amplifying laser cavity. authors show method for repetition rate control these waves over both fine and large scales.
We experimentally demonstrate Time-Resolved Nonlinear Ghost Imaging and its ability to perform hyperspectral imaging in difficult-to-access wavelength regions, such as the Terahertz domain. operate by combining nonlinear quadratic sparse generation detection Fourier plane. that traditional time-slice approaches are prone essential limitations near-field due space-time coupling, which is overcome our technique. As a proof-of-concept of implementation, we show can provide experimental access...
Abstract Laser cavity-solitons can appear in a microresonator-filtered laser when judiciously balancing the slow nonlinearities of system. Under certain conditions, such optical states be made to self-emerge and recover spontaneously, understanding their robustness is critical for practical applications. Here, we study formation bonded state comprising soliton blue-detuned continuous wave, whose coexistence mediated by dispersion nonlinear refractive index. Our real-time dispersive Fourier...
Laser cavity-solitons can appear in systems comprised of a nonlinear microcavity nested within an amplifying fiber loop. These states are robust and self-emergent constitute attractive class solitons that highly suitable for microcomb generation. Here, we present detailed study the free-running stability properties carrier frequency repetition rate single solitons, which most developing ultrafast high comb sources. We achieve fractional on both optical (i.e., 48.9 GHz) frequencies order 10−9...
We report an integrated all-optical radio frequency spectrum analyzer based on a ~4 cm long doped silica glass waveguide, with bandwidth greater than 2.5 THz. use this device to characterize the intensity power of ultrahigh repetition rate mode-locked lasers at rates up 400 GHz, and observe dynamic noise related behavior not observable other techniques.
We present the first system penalty measurements for all-optical wavelength conversion in an integrated ring resonator. achieve over a range of 27.7nm C-band at 2.5 Gb/s by exploiting four wave mixing CMOS compatible, high index glass resonator ~22 dBm average pump power, obtaining < 0.3 dB penalty.
We propose a scheme for bifurcation control in micro-cavities based on the interplay between ultrafast Kerr effect and slow nonlinearity, such as thermo-optical, free-carriers-induced, or opto-mechanical one. demonstrate that Hopf bifurcations can be efficiently controlled with low energy signal via four-wave mixing. Our results show new strategies are possible designing efficient micro-cavity-based oscillators sensors. Moreover, they provide understanding of coherent wave mixing thermal...
Optical frequency combs in microresonators [1] or microcombs have generated significant attention recent decades. Specifically, can be by resonantly coupling a powerful CW laser light microcavity, inducing multiple oscillation parametric generation. A well-known route to comb generation starts from the modulation instability (MI) of pump. MI generates coherent lines spaced more than one free spectral range microcavity [2]. This kind optical spectrum is generally referred as Type I [3], and...
Terahertz (THz) spectroscopy systems are widely employed to retrieve the chemical and material composition of a sample. This is single-handedly most important driving motivation in field has largely contributed shaping THz science as an independent subject. The limited availability high-resolution imaging devices, however, still represents major technological challenge this promising research. In theoretical work, we tackle by developing novel nonlinear ghost approach that conceptually...
Laser cavity-soliton microcombs are robust optical pulsed sources, usually implemented with a microresonator-filtered fibre laser. In such configuration, nonlinear microcavity converts the narrowband pulse resulting from bandwidth-limited amplification to background-free broadband microcomb. Here, we theoretically and experimentally study soliton conversion efficiency between input two outputs of four-port integrated microcavity, namely 'Drop' 'Through' ports. We simultaneously measure...
Turing patterns and solitons are a common occurrence in systems that out of equilibrium. For example, they regulate the emergence organised structures biology chemistry. In optics, study temporal rolls cavity-solitons nonlinear micro-cavity resonators has been key to understanding optical frequency comb formation these structures. Over decade, impact microresonator-based approaches generating combs – so-called "Micro-combs or "Kerr combs" reached far beyond metrology applications. Here we...
Terahertz time-domain imaging targets the reconstruction of full electromagnetic morphology an object. In this spectral range, near-field propagation strongly affects information in space-time domain items with microscopic features. While often represents a challenge, as needs to be disentangled obtain high image fidelity, here, we show that such phenomenon can enable three-dimensional microscopy. Specifically, investigate capability time-resolved nonlinear ghost methodology implement...