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Doctoral Thesis
DOI
https://doi.org/10.11606/T.76.2024.tde-17052024-084536
Document
Author
Full name
Manuel Alejandro Lefrán Torres
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2024
Supervisor
Committee
Marcassa, Luis Gustavo (President)
Cesar, Claudio Lenz
Kondo, Jorge Douglas Massayuki
Miranda, Marcio Heraclyto Gonçalves de
Muniz, Sérgio Ricardo
Title in Portuguese
Resfriamento de moléculas de Rubídio por bombeamento ótico utilizando fontes laser banda larga
Keywords in Portuguese
Fontes laser banda larga
Modelagem espectral
Moléculas frias
Resfriamento rovibracional
Abstract in Portuguese
Moléculas diatômicas polares apresentam um amplo campo de possíveis aplicações em pesquisa básica assim como em tecnológicas, as quais estão associadas as interações dipolares de longo alcance e sua estrutura interna. Contudo, a produção de amostras moleculares densas e frias é ainda muito complexa devido à essa mesma estrutura interna, requerendo várias fontes de laser. O desenvolvimento de técnicas de resfriamento, aplicáveis para qualquer molécula é fundamental para o sucesso dessa área. Neste trabalho, estudamos teoricamente e experimentalmente o resfriamento de moléculas térmicas de 85Rb2 utilizando fontes laser banda largas. Em particular, estudamos as transições entre os potenciais fundamental X 1Σg+ e o excitado B 1 Πu, utilizando lasers de diodo multimodos banda larga, cujos espectros podiam ser manipulados utilizando micro-espelhos. O espectro molecular foi obtido através da fotoionização ressonante das moléculas usando lasers pulsados. Os resultados obtidos sugerem que a manipulação de estados moleculares é viável através de bombeamento ótico.
Title in English
Cooling of Rubidium molecules by optical pumping using broadband laser sources
Keywords in English
Broadband laser sources
Cold molecules
Rovibrational cooling
Spectral shaping
Abstract in English
Polar diatomic molecules present a broad range of potential applications in both basic and technological research, associated with long-range dipolar interactions and their internal structure. However, the production of dense and cold molecular samples remains highly complex due to this internal structure, requiring multiple laser sources. The development of cooling techniques applicable to any molecule is crucial for the success of this field. In this study, we theoretically and experimentally investigate the cooling of thermal molecules of 85Rb2 using broad-band laser sources. Specifically, we examine transitions between the ground-state potential X1Σg+ and the excited state B1 Πu, employing broad-band multimode diode lasers whose spectra can be manipulated using micro-mirrors. The molecular spectrum was obtained through resonant photoionization of the molecules using pulsed lasers. The results suggest that the manipulation of molecular states is achievable through optical pumping.
 
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Publishing Date
2024-05-17
 
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