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Doctoral Thesis
DOI
https://doi.org/10.11606/T.76.2011.tde-29082011-104357
Document
Author
Full name
Carlos Renato Menegatti
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2011
Supervisor
Committee
Marcassa, Luis Gustavo (President)
Fellows, Carlos Eduardo
Moussa, Miled Hassan Youssef
Tabosa, José Wellington Rocha
Varella, Marcio Teixeira do Nascimento
Title in Portuguese
Armadilha de dipolo para átomos e moléculas
Keywords in Portuguese
Armadilha de dipolo
Átomos frios
Colisões frias
Fotoassociação
Moléculas frias
Abstract in Portuguese
Neste trabalho apresentamos a construção de um novo sistema experimental para aprisionamento de átomos e moléculas. Trata-se de uma armadilha de dipolo cruzada totalmente óptica, formada por um laser de fibra com 40 W de potência com comprimento de onda em 1064 nm. Nesse sistema foi demonstrado o aprisionamento de átomos Rb e K e moléculas Rb2. Realizamos dois experimentos distintos neste se novo sistema: No primeiro, estudamos a evolução temporal de amostras dos isótopos 85Rb e 87Rb na armadilha de dipolo cruzada. Pudemos medir pela primeira vez o processo de mudança de estrutura hiperfina em átomos sem a presença de luz ressonante, e observamos a fotoassociação dos átomos pelo laser da armadilha de dipolo. E no segundo, desenvolvemos uma técnica que permite o estudo rápido e direto do decaimento no número de moléculas de Rb2 na armadilha. Com essa técnica, observamos também o comportamento dessas moléculas na presença de átomos preparados em um determinado estado hiperfino do estado fundamental. Estes resultados juntamente com um desenvolvimento teórico, nos sugerem novas perspectivas rumo a produção de um sistema que possa produzir e aprisionar moléculas KRb no estado fundamental 1Σ+ (v = 0).
Title in English
A dipole trap for atoms and molecules
Keywords in English
Cold atoms
Cold collisions
Cold molecules
Dipole trap
Photoassociation
Abstract in English
In this work, we present the construction of a new experimental system for trapping atoms and molecules. It is an all optical crossed dipole trap, formed by a fiber laser with 40 W of power at 1064 nm. In this system, we have trapped K and Rb atoms as well as Rb2 molecules. We have carried out two experiments in this new system. In the first, we studied the temporal evolution of atomic samples of different isotopes, 85Rb and 87Rb, in the crossed trap dipole. We were able to measure for the first time the hyperfine-changing collisions of atoms in the absence of resonant light, and we have observed photoassociation of atoms by the dipole trap laser beam. In the other experiment, we have developed a technique that allows us to study the trapped molecule population decay in the trap. It was also observed the molecule population decay in the presence of atoms prepared in a given hyperfine state of the ground state. These results together with a theoretical development may suggest us new perspectives towards the production of a system that can produce and trap KRb molecules in the ground state 1Σ+ (v = 0).
 
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Publishing Date
2011-08-30
 
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