Magneto Optical Traps
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Moléculas frias em armadilhas ópticas / Cold molecules in optical traps.
Neste trabalho estudamos o processo de ressonância colisional o que nos permitiu aumentar a taxa de formação molecular em até seis vezes. Isto foi feito variando-se a temperatura atômica de uma amostra inicialmente aprisionada em uma armadilha magneto óptica (MOT) através de um passo de resfriamento do tipo melaço óptico (molasses). Uma explicação
Publicado em: 2009
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2. Construção de uma armadilha de dipolo com laser de CO2. / Constrution of a dipole trap using a CO2 laser
In this work we present the construction of an optical dipole trap using a CO2 laser, which involves the use of news and modern technologies never utilized by our group up to now. We have builded a new trap chamber with large optical access, used atomic dispensers as an atomic source and a high power CO2 laser and its optical components. We have demonstrated
Publicado em: 2006
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3. Estudo de colisões atômicas ultrafrias: mecanismos de perda e espectroscopia de fotoassociação. / Investigation of ultracold atomic collisions: trap loss mechanisms and photoassociation spectroscopy.
Neste trabalho, abordamos dois assuntos independentes e interessantes que permeiam o cotidiano dos pesquisadores da área de resfriamento e confinamento de átomos neutros. O primeiro está relacionado aos processos de perda de átomos ocorrendo em armadilhas magneto-ópticas, a partir das quais o fenômeno é observado. Mostramos que a conjunção de dois m
Publicado em: 2002
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4. Colisões Inelásticas Frias em Amostras Heteronucleares obtidas em Armadilhas Magneto-Ópticas. / Cold inelastic collisions in two species magneto optical traps.
We report the results of the trap-Ioss collisional rates observed in a mixed species magneto-optical trapo These are the first systematic studies about the collisionalloss channels due to heteronuclear interactions between two cold atomic sampIes in aMOr. We have used two different combinations: Na-Rb and K -Rb. lt was observed that the rates are strongly af
Publicado em: 1998
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5. Studies on Optical Shielding of Cold Collisions / Estudo de Blindagem Óptica em Colisões Frias
In this work, we showed that is possible to suppress most of the inelastic processes that may cause losses of atoms in a magneto-optical trap. Our results reveal that the process of optical shielding (demonstrated by our group, for the first time to photoassociative ionization - Phys. Rev. Lett. 73, 1911 (1994)) is much more general than it was supposed. Eve
Publicado em: 1998
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6. Caracterização de uma armadilha magneto-optica para átomos de sódio em célula de vapor. / Characterization of a magneto-optical trap for sodium atoms in vapor cell.
Among the various atomic motion control techniques using radiation pressure magneto-optic trapping has been looked at with great enthusiasm because it produces samples of cold atoms (temperatures about μK), with high densities and confined in small regions of space. Due to these motivations the efforts for developing and characterizing these atoms traps
Publicado em: 1994
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7. Design for an optical cw atom laser
A new type of optical cw atom laser design is proposed that should operate at high intensity and high coherence and possibly record low temperatures. It is based on an “optical-shepherd” technique, in which far-off-resonance blue-detuned swept sheet laser beams are used to make new types of high-density traps, atom waveguides, and other components for ac
National Academy of Sciences.