0000000000164948

AUTHOR

Lorenzo Colace

showing 6 related works from this author

Second-harmonic generation in surface periodically poled lithium niobate waveguides:On the role of multiphoton absorption

2008

Second harmonic generation is investigated in lithium niobate channels realized by proton exchange and quasi-phase-matched by surface periodic-poling. The reduction in conversion efficiency at high powers is interpreted in terms of multi-photon absorption via two-color terms, yielding an estimate of the dominating three-photon process.

Surface (mathematics)Materials sciencePhysics and Astronomy (miscellaneous)Protonbusiness.industryLithium niobateEnergy conversion efficiencyGeneral EngineeringGeneral Physics and AstronomySecond-harmonic generationFOS: Physical sciencesPhysics::Opticschemistry.chemical_compoundchemistryOptoelectronicslithium niobate channel multi-photon absorptionbusinessAbsorption (electromagnetic radiation)Physics - OpticsOptics (physics.optics)
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Nanopatterned ferroelectric crystals for parametric generation

2006

We report on recent results by surface periodic poling on lithium niobate and lithium tantalate. Such approach allows periodic inversion of the second order susceptibility with nanoscale features using insulating masks. We achieved a world-best 200 nm feature size, as well as good compatibility with alpha-phase proton exchanged channel waveguides in lithium niobate. Preliminary results of surface periodic poling in lithium tantalate also show similar characteristics. Surface poling is best suited for integrated optics devices in technologically-demanding configurations such as backward second harmonic generation and counter propagating optical parametric amplification

Nonlinear integrated opticsOptical frequency multiplierMaterials sciencebusiness.industryParametric generationPolingLithium niobateSecond-harmonic generationPhysics::OpticsLithium tantalateSurface periodic polingLithium niobateFerroelectricityOptical parametric amplifierchemistry.chemical_compoundOpticschemistryPeriodic polingLithium tantalatebusiness
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Guided-wave frequency doubling in surface periodically poled lithium niobate: competing effects

2007

We carried out second-harmonic generation in quasi-phase-matched ? -phase lithium niobate channel waveguides realized by proton exchange and surface periodic poling. Owing to a limited ferroelectric domain depth, we could observe the interplay between second-harmonic generation and self-phase modulation due to cascading and cubic effects, resulting in a nonlinear resonance shift. Data reduction allowed us to evaluate both the quadratic nonlinearity in the near infrared as well as the depth of the uninverted domains. © 2007 Optical

Nonlinear optics integrated opticsMaterials scienceGuided wave testingbusiness.industryLithium niobateNonlinear opticsSecond-harmonic generationPhysics::OpticsFOS: Physical sciencesStatistical and Nonlinear PhysicsHarmonic generation and mixingSettore ING-INF/01 - ElettronicaFerroelectricityAtomic and Molecular Physics and Opticschemistry.chemical_compoundOpticschemistryPeriodic polingNonlinear resonanceHigh harmonic generationbusinessPhysics - OpticsOptics (physics.optics)
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Bi-color spatial solitons in linearly uncoupled planar waveguides

2004

We report on the observation of spatial optical simultons in a novel geometry consisting of two partially overlapped, linearly uncoupled planar waveguides in lithium niobate obtained by reverse proton exchange. Two orthogonally polarized modes are coupled through an off-diagonal tensor element of the quadratic nonlinearity, giving rise to second harmonic generation and mutual trapping via cascading. This phenomenon demonstrates a balance between diffraction and self-focusing for two orthogonal modes of different waveguides, and occurs at room temperature in longitudinally uniform waveguides.

PhysicsDiffractionPhysics and Astronomy (miscellaneous)Protonbusiness.industryLithium niobatePhysics::OpticsSecond-harmonic generationNonlinear opticsTrappingMolecular physicsAtomic and Molecular Physics and Opticschemistry.chemical_compoundOpticsPlanarchemistryTensorbusiness
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Proton exchange channel waveguides compatible with surface domain engineering in Lithium Niobate crystals

2006

First experiments of proton exchange channel waveguides compatible with electric field surface periodic poling of congruent lithium niobate crystals are addressed. Picosecond nonlinear copropagating QPM-SHG measurements have been carried out on such structures.

Materials scienceProtonbusiness.industryLithium niobatePhysics::OpticsNonlinear opticsCondensed Matter::Materials Sciencechemistry.chemical_compoundchemistrySurface wavePeriodic polingElectric fieldPicosecondOptoelectronicsPhysics::Atomic PhysicsbusinessRefractive index2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference
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Frequency doubling in surface periodically poled lithium niobate waveguides: Competing effects

2007

We fabricated α-phase pro ton-exchanged (PE) lithium niobate (LN) channel waveguides quasi phase-matched (QPM) via surface periodic poling (SPP) and carried out the first experimental demonstration of second harmonic generation (SHG) in such devices.[1] Experiments were performed by employing an optical parametric amplifier/oscillator producing 25 ps pulses in the range 1.1-1.6 μm with a line-width less than 2cm−1 and a repetition rate of 10Hz. SHG measurements were performed either at a fixed wavelength by varying the fundamental frequency (FF) input power or by scanning the FF wavelength, ratioing the second harmonic (SH) output to the FF input to obtain the conversion efficiency. By repe…

Surface (mathematics)Optical amplifierMaterials sciencebusiness.industryLithium niobateSecond-harmonic generationPhysics::OpticsWaveguide (optics)Power (physics)chemistry.chemical_compoundTransverse planeOpticschemistryPeriodic polingbusiness
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