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Doctoral Thesis
DOI
10.11606/T.76.2013.tde-24042013-111126
Document
Author
Full name
Bruno Spolon Marangoni
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2013
Supervisor
Committee
Marcassa, Luis Gustavo (President)
Barbosa, Daniel Felinto Pires
Boni, Leonardo De
Moussa, Miled Hassan Youssef
Paixão Filho, Fernando Jorge da
Title in Portuguese
Colisões heteronucleares em uma armadilha de dipolo
Keywords in Portuguese
Armadilha de dipolo
Átomos frios
Colisões frias
Fotoassociação
Abstract in Portuguese
Neste trabalho, apresentamos uma montagem experimental capaz de aprisionar átomos de K e Rb simultaneamente em uma armadilha óptica de dipolo cruzada. Contudo, para atingir este feito foi necessário, durante o desenvolvimento do projeto, estudar cada espécie atômica de forma isolada. Assim, desenvolvemos uma técnica inédita para carregar uma armadilha de dipolo diretamente de uma armadilha magneto-óptica de 39K, constatando a importância da estrutura hiperfina do estado 4P3/2 no processo de carregamento. Também observamos e explicamos o processo de fotoassociação de Rb devido ao laser em 1071 nm, inclusive a diferença isotópica entre 85Rb e 87Rb. Na sequência, realizamos o carregamento duplo com K e Rb na armadilha e observamos a fotoassociação de KRb. Um modelo teórico simples prevê a distribuição dos níveis vibracionais obtidos. O mesmo modelo abre caminho para um possível bombeamento óptico para a produção e acúmulo de moléculas de KRb no estado X1Σ+ (v = 0).
Title in English
Heteronuclear colisions in a dipole trap
Keywords in English
Cold atoms
Cold colisions
Dipole trap
Photoassociation
Abstract in English
In this paper, we present an experimental setup to simultaneously trap atoms of K and Rb in a crossed optical dipole trap. This accomplishment required the individual study of each atomic species during the project development. This allowed the development of a new technique for loading a dipole trap directly from a magneto-optical trap of 39K, providing evidence of the importance of the hyperfine structure of the state 4P3/2 in the loading process. We also observe and explain the photoassociation process of Rb2 due to the dipole trap laser at 1071 nm, including an isotopic difference between 85Rb and 87Rb. In the sequence, we performed dual species loading of K and Rb and observed the photoassociation process of KRb. A simple theoretical model predicts the final distribution of vibrational levels obtained. The same model provides a potential path to optically pump the molecules and accumulate them in the molecular ground state X1Σ+ (v = 0) for KRb.
 
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Publishing Date
2013-04-29
 
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