Search results for "Frequency multiplier"

showing 4 items of 4 documents

Identification of parameters and harmonic losses of a deep-bar induction motor

2017

High frequency harmonics from a frequency converter causes additional losses in a deep-bar induction motor. The harmonics have their own amplitude and phase with respect to the fundamental signal, but the harmonic loss is only dependent on the amplitude of harmonics. A deep-bar induction motor can be modelled by a triple-cage circuit to take skin effect into account. The triple cage circuit having many parameters could be estimated from a small-signal model of the machine by using Differential Evolution. The correctly estimated parameters make the triple-cage circuit valid in a wide range of frequencies. However, the triple-cage circuit is very complicated which makes it difficult to model …

010302 applied physicsPhysicsFrequency multiplier020208 electrical & electronic engineering02 engineering and technologyLC circuit01 natural sciencesHarmonic analysisComputer Science::Hardware ArchitectureComputer Science::Emerging TechnologiesControl theoryHarmonics0103 physical sciences0202 electrical engineering electronic engineering information engineeringHarmonicEquivalent circuitInduction motorLinear circuit2017 Seventh International Conference on Information Science and Technology (ICIST)
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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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Ultraviolet generation in periodically poled Lithium Tantalate waveguides

2008

We demonstrate ultraviolet generation in lithium tantalate channel waveguides for frequency doubling via quasi-phase-matching. The samples, proton exchanged and nanostructured by electric-field assisted surface periodic poling with domains as deep as 40 μm, yield continuous wave light at 365.4 nm with conversion efficiencies larger than 7.5% W-1 cm-2.

Optical frequency multiplierMaterials sciencePhysics and Astronomy (miscellaneous)Protonbusiness.industrymedicine.disease_causechemistry.chemical_compoundOpticsFrequency conversionchemistryPeriodic polingYield (chemistry)Lithium tantalatemedicineContinuous waveOptoelectronicsbusinessUltraviolet
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Soft proton exchanged channel waveguides in congruent lithium tantalate for frequency doubling

2010

We report on stable optical waveguides fabricated by soft-proton exchange in periodically-poled congruent lithium tantalate in the a-phase. The channel waveguides are characterized in the telecom wavelength range in terms of both linear properties and frequency doubling. The measurements yield a nonlinear coefficient of about 9.5pm/V, demonstrating that the nonlinear optical properties of lithium tantalate are left nearly unaltered by the process. (C) 2010 Optical Society of America

Optical frequency multiplierMaterials scienceProtonPhysics::OpticsTantalumLithiumNonlinear opticalchemistry.chemical_compoundOpticsbusiness.industrySecond-harmonic generationOxidesEquipment DesignSurface Plasmon ResonanceAtomic and Molecular Physics and OpticsEquipment Failure AnalysisNonlinear systemRefractometrychemistryNonlinear DynamicsYield (chemistry)Lithium tantalateComputer-Aided DesignChannel (broadcasting)ProtonsbusinessNonlinear optics Integrated optics materials Waveguides Nonlinear optical devices
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