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Thesis supplementary data: Laser cooling and optical trapping of Ytterbium Open Access

This thesis presents the development of an experimental apparatus designed to investigate the ultracold collisional properties for mixtures of Cs and Yb, with a long-term view to the creation of ultracold CsYb molecules via indirect cooling methods. The unpaired electron spin that is inherent to molecules of this form gives rise to a magnetic dipole moment in addition to a ground state electric dipole moment. This enables extra control over molecular interactions and should enable the experimental simulation of spin lattice models. We focus on the implementation of a system designed to controllably laser cool and optically trap Yb. The first step in this system is the production of a magneto-optical trap (MOT) on the triplet 1S0 to 3P1 transition of Yb. With careful control over the cooling beam detunings and power, gravitational-assisted Doppler cooling allows samples of Yb to be prepared at 22uK. This regime of enhanced Dopper cooling is investigated and proves to be a crucial step to ensuring good transfer of cold Yb to optical traps. The construction and characterisation of single and crossed beam optical dipole traps for Yb are discussed. The single beam optical trap has been used to verify a model for the optical trapping of Yb in its ground state. This trap has also been utilised as a tool for the measurement of the light shift on the 1S0 to 3P1 transition at a wavelength of 1070 nm. In the main experimental sequence, Yb atoms are loaded from the magneto-optical trap into the crossed optical dipole trap, allowing evaporative cooling ramps to quantum degeneracy to be performed. This highly-reproducible system typically forms Bose-Einstein condensates with 2x 10^5 174Yb atoms. This thesis additionally reports on the progress made towards measurements of the interspecies scattering length for 133Cs and Yb isotopes. We present two approaches that are being developed in tandem: rethermalisation in a conservative trap, and two-photon photoassociation. Progress towards rethermalisation measurements has focussed on developing systems for the efficient transfer of Cs to an optical trap. For photoassociative measurements, a laser system has been developed and tested by producing one-photon photoassociation spectra of Cs2.

Descriptions

Resource type

Dataset

Contributors

Creator: Kemp, Stefan ¹

¹ Durham University, UK

Funder

Engineering and Physical Sciences Research Council

Research methods

Other description

Keyword

CsYb
Molecules
Ultracold
Optical trapping
Laser cooling
Bose-Einstein condensation
Ytterbium
Caesium

Subject

Atomic Physics

Location

Language

English

Cited in

Identifier

ark:/32150/r1mw22v545d
doi:10.15128/r1mw22v545d

Rights

All rights reserved All rights reserved

Publisher

Durham University

Date Created

2017-05-18

File Details

Depositor

S.L. Kemp

Date Uploaded

18 May 2017, 21:05:36

Date Modified

28 May 2017, 17:05:37

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Characterization

File format: zip (ZIP Format)

Mime type: application/zip

File size: 20850142

Last modified: 2017:05:18 22:47:24+01:00

Filename: Stefan_Kemp-PHD_Thesis_Data-2017.zip

Original checksum: e46d738beeab0a98d4934762f3b13c71