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Title: Trapping of rubidium atoms using optical tweezers
Author: Brandt, Lukas
ISNI:       0000 0004 2723 0164
Awarding Body: Oxford University
Current Institution: University of Oxford
Date of Award: 2011
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This thesis describes the realisation of a novel dipole force trapping method for cold neutral atoms, the optical tweezers. They are formed by imaging a spatial light modulator onto a mirror surface, by an aspherical lens. The spatial light modulator, a digital mirror device, consists of an array 1024 by 768 of micro-mirrors, which can individually be switched between the on and off position with a full frame refresh rate of 4 kHz and hence can create arbitrary light patterns in real time. Atoms are trapped through the dipole force in them. The optical tweezers have a potential depth on the order of 1 mK. A magneto-optical surface-trap cools and traps Rubidium atoms close to the mirror surface. Unlike a normal magneto-optical trap, which traps atoms in free space, this trap incorporates a mirror, above which the atoms are trapped and then loaded into the optical tweezers. I will show that we managed to load atoms into the dipole traps with a variety of different potential landscapes and observe them with a highly sensitive CCD-camera through fluorescence imaging. . . Furthermore I study a scheme to use a high powered, but spatial multimode diode laser for atom trapping. An optical diffuser smoothes out the otherwise poor quality profile, to make the high power diode laser applicable for optical tweezers.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available