A5073271138- Advanced Fiber Laser Technologies
- Nonlinear Dynamics and Pattern Formation
- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
- Laser-Matter Interactions and Applications
- Quantum optics and atomic interactions
- Nonlinear Photonic Systems
- Laser Design and Applications
- Optical Network Technologies
- Mechanical and Optical Resonators
- Solid State Laser Technologies
- Advanced Fiber Optic Sensors
- Geophysics and Sensor Technology
- Photonic Crystal and Fiber Optics
- Spectroscopy and Quantum Chemical Studies
- Neural Networks and Reservoir Computing
- Semiconductor Quantum Structures and Devices
- Spectroscopy and Laser Applications
- Quantum chaos and dynamical systems
- Molecular Junctions and Nanostructures
- Quantum Information and Cryptography
- Metamaterials and Metasurfaces Applications
- stochastic dynamics and bifurcation
- Quantum Mechanics and Applications
- Photorefractive and Nonlinear Optics
University of Insubria
2016-2025
Polytechnic University of Turin
1990-2021
Polytechnic University of Bari
2015-2021
Harvard University
2021
Istituto di Fotonica e Nanotecnologie
2021
Center for Nano Science and Technology
2021
Italian Institute of Technology
2021
Harvard University Press
2021
ALTA (Italy)
2020
National Interuniversity Consortium for the Physical Sciences of Matter
2008-2017
Polarization-state selection, polarization-state dynamics, and polarization switching of a quantum-well vertical-cavity surface-emitting laser (VCSEL) for the lowest order transverse spatial mode is explored using recently developed model that incorporates material birefringence, saturable dispersion characteristic semiconductor physics, sensitivity transitions in to vector character electric field amplitude. Three features contribute observed linearly polarized states emission: linear gain...
We analyze the interaction and competition of a set transverse cavity modes, which belong to frequency-degenerate family. The laser turns out be able realize several different stationary spatial patterns, differ in configuration intensity or field are met by varying values control parameters. A striking feature that emerges almost all steady-state patterns is presence dark points, both real imaginary part electric vanish such that, if one covers closed loop around these phase changes...
Semiconductor devices are the most appealing systems for information encoding using two-dimensional spatial solitons, recently reported both theoretically and experimentally in model systems. We show that stable solitons can be realized controlled, passive microresonators with excitonic nonlinearity below-threshold vertical-cavity lasers. The robust enough to withstand significant carrier diffusion self-defocusing, which is very encouraging device applications.
We consider a semiconductor microcavity driven by coherent and stationary holding beam, in two distinct configurations. In the first, no carriers are injected multiple-quantum-well structure optical nonlinearity is governed an excitonic resonance. The second corresponds to that of vertical-cavity surface-emitting laser kept slightly below threshold. describe both configurations using unified model includes field diffraction carrier diffusion. calculate numerically time evolution profile...
Our ability to generate new distributions of light has been remarkably enhanced in recent years. At the most fundamental level, these patterns are obtained by ingeniously combining different electromagnetic modes. Interestingly, modal superposition occurs spatial, temporal as well spatio-temporal domain. This generalized concept structured is being applied across entire spectrum optics: generating classical and quantum states light, harnessing linear nonlinear light-matter interactions,...
We show that the stationary transverse patterns, formed by interaction of modes a frequency-degenerate family, are selected laser according to specific variational principle. discuss phenomenon spatial multistability, which consists in coexistence two or more different configurations for same values control parameters. establish general connection between physics and hydrodynamics, reformulating dynamical equations form hydrodynamical compressible fluid, similar law mass conservation...
Frequency combs have become a prominent research area in optics. Of particular interest as integrated comb technology are chip-scale sources, such semiconductor lasers and microresonators, which consist of resonators embedding nonlinear medium either with or without population inversion. Such active passive cavities were so far treated distinctly. Here we propose formal unification by introducing general equation that describes both types cavities. The also captures the physics hybrid...
We experimentally demonstrate the existence and control of cavity solitons in externally driven vertical-cavity semiconductor lasers above threshold. A model including material polarization dynamics is used to predict confirm experimental findings.
We derive a spatiotemporal equation describing nonlinear optical dynamics in Fabry-Perot (FP) cavities containing Kerr medium. This is an extension of the that describes Kerr-nonlinear ring resonators, referred to as Lugiato-Lefever (LLE) due its formulation by Lugiato and Lefever 1987. use study generation properties frequency combs FP resonators. The derivation starts from set Maxwell-Bloch equations govern forward backward propagating envelopes electric field coupled atomic polarization...
Coupling is an essential mechanism that drives complexity in natural systems, transforming single, noninteracting elements into intricate networks with rich physical properties. Here, we demonstrate a chip-scale coupled laser system exhibits complex optical states impossible to achieve uncoupled system. We show pair of semiconductor ring lasers spontaneously forms frequency comb consisting the hybridized modes its cavity, exhibiting large number phase-locked tones anticross one another....
Switching between linearly polarized states of slightly different optical frequencies with the same transverse-mode pattern is found, as injection current increased. Switchings found here for semiconductor rate-equation models incorporating a vector electric field, birefringence, and α factor are similar to previously reported experimental results.
We consider a cylindrically symmetrical laser with spherical mirrors and describe the dynamics in terms of competition among different Gauss-Laguerre modes cavity. In this paper we focus on case which mode leads to dynamical state that, according values control parameters, can be periodic or quasiperiodic. The linear stability analysis single-mode stationary solutions, oscillates fundamental ${\mathrm{TEM}}_{00}$ ${\mathrm{TEM}}_{01}^{\mathrm{*}}$ mode, provides an initial guideline our...
We analyze the simplest dynamical transverse patterns which appear in ${\mathrm{Na}}_{2}$ and ${\mathrm{CO}}_{2}$ lasers. The experimental values of control parameters correspond closely to those considered theoretical study reported companion paper [Brambilla et al., preceding paper, Phys. Rev. A 49, 1427 (1994)]. perform a systematic comparsion between predictions observations.
We generalize the traditional Maxwell-Bloch theory of a ring laser and analyze dynamical role transverse effects. With help suitable extension uniform-field limit we perform an essentially analytical study steady-state linear-stability properties resonator containing homogeneously broadened active medium. In this context incorporate effects curved reflecting surfaces, possible lack uniformity pump, detailed structure cavity modes. prove that steady state is single-mode variety stability can...
We experimentally demonstrate the existence of nondispersive solitary waves associated with a $2\ensuremath{\pi}$ phase rotation in strongly multimode ring semiconductor laser coherent forcing. Similarly to Bloch domain walls, such structures host chiral charge. The numerical simulations based on set effective Maxwell-Bloch equations support experimental evidence that only one sign charge is stable, which affects motion solitons. Furthermore, reduction model modified Ginzburg-Landau equation...
Abstract Modelocked lasers constitute the fundamental source of optically-coherent ultrashort-pulsed radiation, with huge impact in science and technology. Their modeling largely rests on master equation (ME) approach introduced 1975 by Hermann A. Haus. However, that description fails when medium dynamics is fast and, ultimately, light-matter quantum coherence relevant. Here we set a rigorous general ME framework, coherent (CME), overcomes both limitations. The CME predicts strong deviations...
We study extreme events occurring in the transverse $(x,y)$ section of field emitted by a broad-area semiconductor laser with saturable absorber. The spatiotemporal on which we perform statistical analysis are identified as maxima intensity three-dimensional space $(x,y,t)$. identify regions parameter where more likely to occur and connection those cavity solitons that known exist same system, both stationary self-pulsing.
Injection-locked semiconductor lasers can be brought to a neuronlike excitable regime when parameters are set close the unlocking transition. Here we study experimentally response of this system repeated optical perturbations and observe existence refractory period during which not able elicit an response. The results analyzed via simulations dynamical equations reproduced adequately experimental results.