Search results for "Phase matching"

showing 6 items of 16 documents

Random quasi-phase matching in congruent lithium tantalate waveguides by proton exchange

2012

A report is presented on broadband second-harmonic generation in the range between 930 and 970 nm using random quasi-phase matching in a planar waveguide fabricated by soft proton exchange in congruent lithium tantalate. Bulk and waveguide measurements are compared, outlining the averaging role of guided-wave modes and their interactions with respect to spectral acceptance and near-field profile.

Quasi-phase-matchingRandom quasi-phase matchingRange (particle radiation)Materials scienceProtonbusiness.industryPhysics::OpticsSettore ING-INF/02 - Campi ElettromagneticiMolecular physicsSettore ING-INF/01 - Elettronicalaw.inventionchemistry.chemical_compoundPlanarOpticschemistrylawLithium tantalateBroadbandlithium tantalateElectrical and Electronic EngineeringbusinessWaveguideoptical waveguide
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Second Harmonic Generation via Random Quasi-phase Matching in a Periodically Poled Lithium Tantalate Waveguide

2011

We observe second harmonic generation via random quasi phase matching in a 1.5μm periodically poled lithium tantalate. The presence of a slab waveguide allows the comparison between bulk and guided wave configurations.

Second Harmonic Generation Lithium Tantalate Random Quasi-phase Matching rQPM SHGSettore ING-INF/02 - Campi ElettromagneticiSettore ING-INF/01 - Elettronica
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Exploiting the optical quadratic nonlinearity of zinc-blende semiconductors for guided-wave terahertz generation: A material comparison

2010

We present a detailed analysis and comparison of dielectric waveguides made of CdTe, GaP, GaAs and InP for modal phase matched optical difference frequency generation (DFG) in the terahertz domain. From the form of the DFG equations, we derived the definition of a very general figure of merit (FOM). In turn, this FOM enabled us to compare different configurations, by taking into account linear and nonlinear susceptibility dispersion, terahertz absorption, and a rigorous evaluation of the waveguide modes properties. The most efficient waveguides found with this procedure are predicted to approach the quantum efficiency limit with input optical power in the order of kWs.

Semiconductor waveguidesTerahertz radiationPhase (waves)FOS: Physical sciencesPhysics::OpticsOptical powerFrequency conversionSettore ING-INF/01 - ElettronicaOptical pulse generationSemiconductor materialsDispersion (optics)Optical phase matchingFigure of meritOptical parametric amplifiersElectrical and Electronic EngineeringOptical propagation in nonlinear mediaPhysicsGuided wave testingbusiness.industryOptical frequency conversionCondensed Matter PhysicsAtomic and Molecular Physics and OpticsOptical waveguidesNonlinear systemOptical materialsTerahertz generationOptoelectronicsOptical frequency conversion Optical materials Optical parametric amplifiers Optical phase matching Optical propagation in nonlinear media Optical pulse generation Optical waveguides Frequency conversion Semiconductor materials Semiconductor waveguidesQuantum efficiencybusinessOptics (physics.optics)Physics - OpticsIEEE Journal of Quantum Electronics
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Third-harmonic generation in optical microfibers: From silica experiments to highly nonlinear glass prospects

2012

International audience; Using optical microfibers, phase matching between different propagation modes allows for third-harmonic generation (THG). After detailing the relevant phase matching conditions and overlap integrals, we provide a comparison between THG effective efficiencies in silica and tellurite glasses. We also explain the relatively easy, wideband, conversion that we observe experimentally in silica glass microfibers, from 155 mu m to the green, by the geometry of the tapering region.

business.product_categoryMaterials scienceSilica glassTapering02 engineering and technology01 natural sciences010309 opticsOptics0103 physical sciencesMicrofiberElectrical and Electronic EngineeringPhysical and Theoretical ChemistryWidebandPhase matching[PHYS.PHYS.PHYS-AO-PH]Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]SUPERCONTINUUM GENERATIONbusiness.industry3RD HARMONIC-GENERATION021001 nanoscience & nanotechnologyAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsNonlinear system[ PHYS.PHYS.PHYS-AO-PH ] Physics [physics]/Physics [physics]/Atmospheric and Oceanic Physics [physics.ao-ph]Third harmonic0210 nano-technologybusinessFIBERS
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Nonlinear Disorder Mapping Through Three-Wave Mixing

2010

We implement a simple and powerful approach to characterize the domain distribution in the bulk of quadratic ferroelectric crystals via far-field second-harmonic spectroscopy. The approach is demonstrated in a lithium tantalate sample with periodic electric field poling and random mark-to-space ratio.

lcsh:Applied optics. PhotonicsSecond-harmonic generationMaterials sciencePhysics::OpticsFOS: Physical sciences01 natural sciences010309 opticschemistry.chemical_compoundOpticsimage analysisElectric field0103 physical scienceslcsh:QC350-467Electrical and Electronic Engineering010306 general physicsMixing (physics)image analysis.Condensed matter physicsbusiness.industryPolinglcsh:TA1501-1820Nonlinear opticsSecond-harmonic generationFerroelectricityrandom quasi phase matchingAtomic and Molecular Physics and OpticsNonlinear systemchemistryLithium tantalatebusinesslcsh:Optics. LightPhysics - OpticsOptics (physics.optics)
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Third-harmonic generation in optical microfibers

2012

We explain the relatively easy, wideband, THG conversion that we observe experimentally in silica glass microfibers by the tapering geometry. As a challenging perspective, we compare THG effective efficiencies in silica and tellurite glasses.

medicine.medical_specialtybusiness.product_categoryMaterials scienceSilica glassbusiness.industryTellurite glassTaperingSpectral imagingOpticsMicrofibermedicineWidebandThird harmonicbusinessPhase matching
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