Search results for "Lithium Tantalate."

showing 8 items of 28 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
researchProduct

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
researchProduct

GENERAZIONE DI SECONDA ARMONICA IN GUIDA D’ONDA IN TANTALATO DI LITIO CONGRUENTE CON POLING PERIODICO E CONVERSIONE DI LUNGHEZZA D’ONDA IN BANDA C + L

2010

Here we show the results obtained by the characterization of a lithium-tantalate based device for second-harmonic-generation and all-optical wavelength conversion. The waveguides have been obtained by proton-exchange in a periodically-poled congruent lithium tantalate substrate.

Second-harmonic generation Lithium tantalate Wavelength shifter
researchProduct

Effects of VTE Treatment on Composition of Lithium Tantalate Single Crystals

2011

The vapour transport equilibration (VTE) is used to change the Li/Ta ratio in lithium tantalate single crystals of different crystallographic orientations (Z-cut and Y/128°-cut). Treatment by VTE is shown to provide thin layers in lithium tantalate plates composition of which is close to stoichiometric while the values of the coercive field are different, much smaller compared with congruent single crystals. There are several mechanisms of diffusion of the Li+ ions in LiTaO3 under conditions of VTE the contribution of each being dependent on the crystallographic orientation of the sample.

chemistry.chemical_compoundMaterials scienceThin layerschemistryDiffusionLithium tantalateAnalytical chemistryCoercivityCondensed Matter PhysicsStoichiometryElectronic Optical and Magnetic MaterialsIonFerroelectrics
researchProduct

Random quasi-phase-matched second harmonic generation in periodically poled lithium tantalate

2009

We experimentally observed and explained bulk second harmonic generation via random quasi-phase-matching, derived from a periodically poled lithium tantalate sample with a randomly patterned mark-to-space-ratio.

chemistry.chemical_compoundOpticsMaterials sciencechemistrybusiness.industryHarmonic generation and mixing Nonlinear optics Random quasi-phase-matchingLithium tantalatePhase (waves)Physics::OpticsSecond-harmonic generationNonlinear opticsbusinessSample (graphics)
researchProduct

Surface periodic poling in congruent lithium tantalate

2006

The first demonstration of surface periodic poling of lithium tantalate at high voltages is reported. Periodic domain inversion with mark-to-space ratios close to the optimum 50:50 was successfully achieved down to micrometre periods with good uniformity and repeatability.

chemistry.chemical_compoundOpticsMaterials sciencechemistrybusiness.industryPeriodic polingOptical materialsLithium tantalateElectrical and Electronic EngineeringbusinessVoltageElectronics Letters
researchProduct

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)
researchProduct

Quasi Phase Matched UV Second Harmonic Generation in Lithium Tantalate soft PE Waveguides

2008

We report on first experimental results on UltraViolet second-harmonic generation by first-order quasiphase-matching in a surface periodically poled proton exchanged Lithium Tantalate waveguide. We have achieved a good compatibility with alpha phase proton exchanged channel waveguides in Lithium Tantalate. We held the sample in a temperature controlled oven kept at a constant temperature of 250 °C, to reduce photorefractive damage. The pump source was a Ti-Sapphire laser with a tunability range of 700 - 980 nm and a 40-GHz linewidth. Continuous wave UV light at 365.4 nm was produced with a conversion efficiency of 6.6% W-1cm-2.

second harmonic generationLithium Tantalatesurface periodic poling
researchProduct