Search results for "Nonlinear spectroscopy"

showing 2 items of 2 documents

Modulating the polarization of broadband terahertz pulses from a spintronic emitter at rates up to 10 kHz

2021

Reliable modulation of terahertz electromagnetic waveforms is important for many applications. Here, we rapidly modulate the direction of the electric field of linearly polarized terahertz electromagnetic pulses with 1–30 THz bandwidth by applying time-dependent magnetic fields to a spintronic terahertz emitter. Polarity modulation of the terahertz field with more than 99% contrast at a rate of 10 kHz is achieved using a harmonic magnetic field. By adding a static magnetic field, we modulate the direction of the terahertz field between angles of, for instance, −53° and 53° at kilohertz rates. We believe our approach makes spintronic terahertz emitters a promising source for low-noise modula…

Materials science530 PhysicsSpatial light modulatorsTerahertz radiationPhysics::OpticsLow-noise modulation spectroscopy02 engineering and technologyNonlinear optical crystals01 natural sciencesspintronic terahertz emittersElectric field5390103 physical sciencesElectromagnetic pulse010302 applied physics500 Naturwissenschaften und Mathematik::530 Physik::539 Moderne PhysikCondensed Matter::Otherbusiness.industryLinear polarizationNonlinear spectroscopyBroadband terahertz pulses530 Physik021001 nanoscience & nanotechnologyPolarization (waves)MagnetostaticsAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic MaterialsMagnetic fieldModulationOptoelectronics0210 nano-technologybusinessModulation spectroscopyOptica
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Spectroscopie Raman Anti-Stokes Cohérente femtoseconde (DRASC – fs) : expériences et modélisation dans le cas du mélange H2 – N2 à basse pression

2006

Dans l'objectif du diagnostic de la temperature dans les milieux en combustion, la Diffusion Raman Anti-Stokes Coherente resolue en temps (DRASC - fs) est utilisee pour sonder H 2 dans les melanges H 2 -N 2 a basse pression. Le dispositif DRASC mis en place est decrit en detail. Un nouveau modele de la reponse DRASC temporelle, prenant en compte tous les effets collisionnels specifiques a l'hydrogene (effets dits « de vitesse ») est presentee, ainsi que la comparaison avec l'experience, l'accord se revelant tres satisfaisant.

Physicssymbols.namesake13. Climate action0103 physical sciencesHydrogen moleculesymbolsGeneral Physics and AstronomyPhysical chemistryNonlinear spectroscopy01 natural sciencesRaman scattering010305 fluids & plasmasJournal de Physique IV (Proceedings)
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