Jerome V. Moloney
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Dual-wavelength channel GHz repetition rate mode-locked VECSEL cavities sourced from a common gain medium Open
Mode-locked vertical external cavity semiconductor lasers are a unique class of nonlinear dynamical systems driven far from equilibrium. We present a novel, to the best of our knowledge, experimental result, supported by rigorous microscop…
Self-channeling of a multi-Joule 10 µm picosecond pulse train through long distances in air Open
In the long-wave infrared (LWIR) range, where, due to wavelength scaling, the critical power of Kerr self-focusing P cr in air increases to 300-400 GW, we demonstrate that without external focusing a train of picosecond CO 2 laser pulses c…
Gauge Invariant Formulation of the Semiconductor Bloch Equations Open
We derive gauge invariant semiconductor Bloch equations (GI-SBEs) that contain only gauge invariant band structure; shift vectors, and triple phase products. The validity and utility of the GI-SBEs is demonstrated in intense laser driven s…
View article: Ionization clamping in ultrafast optical breakdown of transparent solids
Ionization clamping in ultrafast optical breakdown of transparent solids Open
We formulate a multi-physics model to describe the nonlinear propagation of a femtosecond, near-infrared, tightly focused laser pulse in a transparent dielectric. The application of our model to the case of bulk sapphire shows that even un…
View article: High-harmonic generation from a subwavelength dielectric resonator
High-harmonic generation from a subwavelength dielectric resonator Open
Higher-order optical harmonics entered the realm of nanostructured solids being observed recently in optical gratings and metasurfaces with a subwavelength thickness. Structuring materials at the subwavelength scale allows us toresonantly …
Hybrid SESAMs for high-repetition rate mode-locked VECSELs Open
A mode-locked VECSEL is reported using a novel hybrid semiconductor saturable absorber mirror (SESAM) consisting of a semiconductor absorber region bonded to a curved dielectric partial reflector. The hybrid SESAM is realized by direct bon…
Gain recovery dynamics in active type-II semiconductor heterostructures Open
Type-II heterostructures as active layers for semiconductor laser devices combine the advantages of a spectrally broad, temperature stable, and efficient gain with the potential for electrical injection pumping. Their intrinsic charge carr…
Higher order long-wave infrared Bessel beams generating tubular plasma waveguides in the atmosphere Open
We numerically investigate the nonlinear propagation of long-wavelength, higher order Bessel pulses in the atmosphere. We show that 10 micron higher order Bessel beams can generate more homogeneous plasma channels than their 800 nm counter…
Coulomb enhancement of high harmonic generation in monolayer transition metal dichalcogenides Open
High harmonic generation (HHG) in monolayer MoS₂ is studied using fully microscopic many-body models based on the semiconductor Bloch equations and density functional theory. It is shown that Coulomb correlations lead to a dramatic enhance…
Coulomb enhancement of high harmonic generation in monolayer transition-metal dichalcogenides Open
High harmonic generation (HHG) in monolayer MoS$_2$ is studied using fully microscopic many-body models based on the semiconductor Dirac-Bloch equations and density functional theory. It is shown that Coulomb correlations lead to a dramati…
Intrinsic carrier losses in tellurium due to radiative and Auger recombinations Open
Fully microscopic many-body models based on inputs from first principles density functional theory are used to calculate the carrier losses due to radiative- and Auger-recombinations in bulk tellurium. It is shown that Auger processes domi…
Intrinsic Carrier Losses in Tellurium Due to Radiative and Auger Recombinations Open
Fully microscopic many-body models based on inputs from first principle density functional theory are used to calculate the carrier losses due to radiative- and Auger-recombinations in bulk tellurium. It is shown that Auger processes domin…
Colliding Pulse Mode Locking and Nonequilibrium Carrier Dynamics within Vertical External-Cavity Surface-Emitting Lasers Open
The complex nonlinear dynamics of colliding counterpropagating ultrashort laser pulses circulating in a vertical external-cavity surface-emitting ring laser cavity are captured by a first-principles quantum-mechanical microscopic model cou…
On the importance of electron–electron and electron–phonon scatterings and energy renormalizations during carrier relaxation in monolayer transition-metal dichalcogenides Open
An ab initio based fully microscopic many-body approach is used to study the carrier relaxation dynamics in monolayer transition-metal dichalcogenides. Bandstructures and wavefunctions as well as phonon energies and coupling matrix element…
Low-threshold operation of GaAs-based (GaIn)As/Ga(AsSb)/(GaIn)As W-quantum well lasers emitting in the O-band Open
The influence of the growth conditions as well as the device design on the device performance of (GaIn)As/Ga(AsSb)/(GaIn)As "W"-quantum well lasers is investigated. To this purpose, the epitaxy process is scaled to full two inch substrates…
Temperature-dependent spectral properties of (GaIn)As/Ga(AsSb)/(GaIn)As\n W-quantum well heterostructure lasers Open
This paper discusses the temperature-dependent properties of\n(GaIn)As/Ga(AsSb)/(GaIn)As W-quantum well heterostructures for laser\napplications based on theoretical modeling as well as experimental findings. A\nmicroscopic theory is appli…
Temperature-dependent spectral properties of (GaIn)As/Ga(AsSb)/(GaIn)As W-quantum well heterostructure lasers Open
This paper discusses the temperature-dependent properties of (GaIn)As/Ga(AsSb)/(GaIn)As W-quantum well heterostructures for laser applications based on theoretical modeling as well as experimental findings. A microscopic theory is applied …
Extension of the LDA-1/2 method to the material class of bismuth containing III–V semiconductors Open
The local density approximation-1/2 method is employed in density functional theory calculations for the electronic structure of III–V dilute bismide systems. For the representative example of Ga(SbBi) with Bi concentrations below 10%, it …
Multi-terawatt femtosecond 10 µm laser pulses by self-compression in a CO<sub>2</sub> cell Open
We propose and numerically investigate a novel direct route to produce multi-terawatt femtosecond self-compressed 10 µm laser pulses suitable for the next generation relativistic laser-plasma studies including laser-wakefield acceleration …
View article: Tunable Near‐ to Far‐Infrared Optical Breakdown in Nonlinear Interactions of Ultrashort Laser Pulses with Water Microdroplets in Ambient Air
Tunable Near‐ to Far‐Infrared Optical Breakdown in Nonlinear Interactions of Ultrashort Laser Pulses with Water Microdroplets in Ambient Air Open
Intense laser pulse propagation results in excitation and partial or complete ionization of aerosols and water microdroplets in the atmosphere. While the problems of light scattering by particles and laser‐induced breakdown in bulk water h…
Extension of the LDA-1/2 method to the material class of bismuth\n containing III-V semiconductors Open
The LDA-1/2 method is employed in density functional theory calculations for\nthe electronic structure of III-V dilute bismide systems. For the\nrepresentative example of Ga(SbBi) with Bi concentrations below $10 \\%$, it is\nshown that th…
Second harmonic generation in metasurfaces with multipole resonant coupling Open
We report on the numerical demonstration of enhanced second harmonic generation (SHG) originating from collective resonances in plasmonic nanoparticle arrays. The nonlinear optical response of the metal nanoparticles is modeled by employin…
View article: Optical Carrier-Wave Subcycle Structures Associated with Supercritical Collapse of Long-Wavelength Intense Pulses Propagating in Weakly Anomalously Dispersive Media
Optical Carrier-Wave Subcycle Structures Associated with Supercritical Collapse of Long-Wavelength Intense Pulses Propagating in Weakly Anomalously Dispersive Media Open
We predict the emergence of attosecond-duration structures on an optical carrier wave when intense, long-wavelength pulses propagate through bulk media with weak anomalous dispersion. Under certain conditions, these structures can undergo …
View article: Plasma-free water droplet shattering by long-wave infrared ultrashort pulses for efficient fog clearing
Plasma-free water droplet shattering by long-wave infrared ultrashort pulses for efficient fog clearing Open
High-power lasers can be used to clear a foggy or cloudy atmosphere by exploding and shattering water microdroplets into smaller fragments. The physics of laser–droplet interaction strongly depend on the excitation wavelength and pulse dur…
Control of the nonlinear response of bulk GaAs induced by long-wavelength infrared pulses Open
The nonlinear optical response of GaAs is studied using extremely nonresonant 10 μm laser pulses with peak intensities greater than 2 GW/cm 2. We observe over an order of magnitude enhancement in the four-wave mixing efficiency by decreasi…
Filamentation of long-wave infrared pulses in the atmosphere [Invited] Open
Filamentation of a high-power laser beam in air opens possibility of the diffraction-compensated propagation of a laser beam over long distances and as such is being considered for remote stand-off detection, lightning control, free-space …
Lattice Resonances in Transdimensional WS2 Nanoantenna Arrays Open
Mie resonances in high-refractive-index nanoparticles have been known for a long time but only recently have they became actively explored for control of light in nanostructures, ultra-thin optical components, and metasurfaces. Silicon nan…