Franco Prati
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View article: Effective Rabi frequency in ultrafast semiconductor lasers: self-starting harmonic frequency combs
Effective Rabi frequency in ultrafast semiconductor lasers: self-starting harmonic frequency combs Open
Optical frequency combs have become a key research topic in optics and photonics. A peculiar comb state is the harmonic frequency comb (HFC), where optical lines are spaced by integer multiples of the cavity’s free-spectral range. The spon…
View article: Solitons in ultrafast semiconductor lasers with saturable absorber
Solitons in ultrafast semiconductor lasers with saturable absorber Open
We describe structure localization and dissipative solitons in a semiconductor laser with a saturable absorber exhibiting gain/absorption recovery times shorter than the photon lifetime. Under assumptions compatible with QCL characteristic…
View article: Effective Rabi frequency in semiconductor lasers and the origin of self-starting harmonic frequency combs
Effective Rabi frequency in semiconductor lasers and the origin of self-starting harmonic frequency combs Open
Optical frequency combs have become a key research topic in optics and photonics. A peculiar comb state is the harmonic frequency comb (HFC), where optical lines are spaced by integer multiples of the cavity's free-spectral range. The spon…
View article: Driven bright solitons on a mid-infrared laser chip
Driven bright solitons on a mid-infrared laser chip Open
Despite the continuing progress in integrated optical frequency comb technology1, compact sources of short, bright pulses in the mid-infrared wavelength range from 3 to 12 μm so far remain beyond reach. The state-of-the-art ultrafast pulse…
View article: Q-switching and harmonic modelocking pulse instabilities of solid-state lasers
Q-switching and harmonic modelocking pulse instabilities of solid-state lasers Open
Passively modelocked solid-state lasers can exhibit two types of instabilities with very different origins. Near threshold, pulses are prone to the Q-switching instability, where pulse energy shows strong periodic modulation over successiv…
View article: Lasing on hybridized soliton frequency combs
Lasing on hybridized soliton frequency combs Open
Coupling is an essential mechanism that drives complexity in natural systems, transforming single, non-interacting elements into intricate networks with rich physical properties. Here, we demonstrate a chip-scale coupled laser system that …
View article: Cavity soliton inhibition of extreme events in lasers with injection
Cavity soliton inhibition of extreme events in lasers with injection Open
Vortex mediated turbulence can be the key element in the generation of extreme events in spatially extended lasers with optical injection. Here, we study the interplay of vortex mediated turbulence and cavity solitons on the onset of extre…
View article: Driven bright solitons on a mid-infrared laser chip
Driven bright solitons on a mid-infrared laser chip Open
Despite the ongoing progress in integrated optical frequency comb technology, compact sources of short bright pulses in the mid-infrared wavelength range from 3 μm to 12 μm so far remained beyond reach. The state-of-the-art ultrafast pulse…
View article: Nozaki-Bekki optical solitons
Nozaki-Bekki optical solitons Open
Recent years witnessed rapid progress of chip-scale integrated optical frequency comb sources. Among them, two classes are particularly significant -- semiconductor Fabry-Perót lasers and passive ring Kerr microresonators. Here, we merge t…
View article: The master equation for passive modelocking
The master equation for passive modelocking Open
Passive modelocking (PML) of lasers is pivotal in modern science and industry. Here, solving a half-century-long challenge, we present the first master equation (ME) describing PML on all time scales, from Q-switched to fundamental and har…
View article: Mode-locking of lasers
Mode-locking of lasers Open
Mode-locked lasers are the fundamental source of ultrashort and ultraintense light pulses and a principal pathway for three Nobel Prize technologies: optical frequency combs, chirped pulse amplification, and attosecond light pulses. They a…
View article: The study of twin phase solitons interaction and switching
The study of twin phase solitons interaction and switching Open
Cavity solitons as part of dissipative localized structures have been of great interest. In cavity, there must be the double balance between dispersion phenomenon and nonlinear phenomena and at the same time the cavity losses are made up f…
View article: Extreme events in a broad-area semiconductor laser with coherent injection
Extreme events in a broad-area semiconductor laser with coherent injection Open
Spatiotemporal extreme events are interesting phenomena, both from a fundamental point of view, as manifestations of complexity in dynamical systems, and for their possible applications in different research fields. Here, we present some r…
View article: Dynamics of passive modelocking in class-B lasers with saturable absorber
Dynamics of passive modelocking in class-B lasers with saturable absorber Open
We address the problem of passive modelocking in class-B lasers with saturable abosrber taking into account the fast dynamics of both gain and absorption. Our model, which is derived from a delay differential equation model, treats in a ri…
View article: Roadmap on multimode light shaping
Roadmap on multimode light shaping Open
Our ability to generate new distributions of light has been remarkably enhanced in recent years. At the most fundamental level, these light patterns are obtained by ingeniously combining different electromagnetic modes. Interestingly, the …
View article: Unifying Frequency Combs in Active and Passive Cavities: Temporal Solitons in Externally Driven Ring Lasers
Unifying Frequency Combs in Active and Passive Cavities: Temporal Solitons in Externally Driven Ring Lasers Open
Frequency combs have become a prominent research area in optics. Of particular interest as integrated comb technology are chip-scale sources, such as semiconductor lasers and microresonators, which consist of resonators embedding a nonline…
View article: Soliton dynamics of ring quantum cascade lasers with injected signal
Soliton dynamics of ring quantum cascade lasers with injected signal Open
Nonlinear interactions in many physical systems lead to symmetry breaking phenomena in which an initial spatially homogeneous stationary solution becomes modulated. Modulation instabilities have been widely studied since the 1960s in diffe…
View article: Self-pulsing in Fabry-Perot lasers: An analytic scenario
Self-pulsing in Fabry-Perot lasers: An analytic scenario Open
We analyze multimode instabilities in the Fabry-Perot laser. It is well known that in the case of a ring cavity the multimode instability can arise only when the pump parameter is several times above threshold. We focus on the parametric c…
View article: Properties of Phase Solitons in an Optically Driven Semiconductor Ring Laser
Properties of Phase Solitons in an Optically Driven Semiconductor Ring Laser Open
A semiconductor ring laser with a long cavity supports propagating localised structures with a chiral charge, named phase solitons. In this paper we study the dependence of the velocity and of the duration of the phase solitons on the char…
View article: From the Lugiato–Lefever equation to microresonator-based soliton Kerr frequency combs
From the Lugiato–Lefever equation to microresonator-based soliton Kerr frequency combs Open
The model, that is usually called the Lugiato–Lefever equation (LLE), was introduced in 1987 with the aim of providing a paradigm for dissipative structure and pattern formation in nonlinear optics. This model, describing a driven, detuned…
View article: Theory of Kerr frequency combs in Fabry-Perot resonators
Theory of Kerr frequency combs in Fabry-Perot resonators Open
We derive a spatiotemporal equation describing nonlinear optical dynamics in\nFabry-Perot (FP) cavities containing a Kerr medium. This equation is an\nextension of the equation that describes dynamics in Kerr-nonlinear ring\nresonators, re…
View article: Extreme events in forced oscillatory media in zero, one and two dimensions
Extreme events in forced oscillatory media in zero, one and two dimensions Open
One of the open questions in the field of optical rogue waves is the\nrelevance of the number of spatial dimensions in which waves propagate. Here we\nreview recent results on extreme events obtained in 0, 1 and 2 spatial\ndimensions in th…
View article: Abnormal chiral events in a semiconductor laser with coherent injection
Abnormal chiral events in a semiconductor laser with coherent injection Open
We study experimentally and theoretically the dynamics of a spatially extended (along the propagation direction) oscillatory medium with coherent forcing. We observe abnormally high events, responsible for a different statistics of intensi…
View article: Extreme events induced by collisions in a forced semiconductor laser
Extreme events induced by collisions in a forced semiconductor laser Open
We report on the experimental study of an optically driven multimode semiconductor laser with a 1 m cavity length. We observed a spatiotemporal regime where real-time measurements reveal very high-intensity peaks in the laser field. Such a…
View article: Spatiotemporal extreme events in a laser with a saturable absorber
Spatiotemporal extreme events in a laser with a saturable absorber Open
We study extreme events occurring in the transverse $(x,y)$ section of the field emitted by a broad-area semiconductor laser with a saturable absorber. The spatio-temporal events on which we perform the statistical analysis are identified …
View article: Publisher's Note: Refractory period of an excitable semiconductor laser with optical injection [Phys. Rev. E <b>95</b>, 012214 (2017)]
Publisher's Note: Refractory period of an excitable semiconductor laser with optical injection [Phys. Rev. E <b>95</b>, 012214 (2017)] Open
This corrects the article DOI: 10.1103/PhysRevE.95.012214.