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Title: Towards collimation of a gallium atomic beam using blue diode lasers
Author: Belshaw, Suzanne Jamesina Alexandra
ISNI:       0000 0001 3457 0245
Awarding Body: Queen's University of Belfast
Current Institution: Queen's University Belfast
Date of Award: 2008
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An integrated experimental setup for proposed work involving laser collimation of a gallium atomic beam has been designed and constructed. Laser cooling transitions in this Group Thirteen element are accessed using commercial blue/violet diode lasers at 403 and 417nm ep1J2 - 2S1/2 and 2P312 - 2S1/2 transitions respectively). For the purpose of laser frequency stabilization, hyperfine-resolved spectra at these wavelengths have been obtained using saturated absorption spectroscopy in a commercial see-through Ga-Ne hollow cathode discharge lamp. A wavelength modulation technique is used to obtain high quality spectra in the presence of severe velocity-changing collisions which render standard amplitude modulation techniques almost completely ineffective. Preliminary locking results using third derivative Iineshapes are reported. In addition, in order to fully study the influence of velocity-changing collisions for various Ga-rare gas combinations, a home-built hollow cathode lamp has been constructed. Resistively-heated home-built and commercial gallium atomic beam sources (required operating temperature -1200°C) have been investigated. Hyperfine transitions at 403 and 417nm have been probed using absorption spectroscopy in a mechanically-collimated atomic beam generated using the home-built source. T.he five laser frequencies necessary to create a closed set of laser cooling transitions involving a large proportion of ground state atoms are derived from the two source lasers using an electro-optic (at 403nm) and acousto-optic (at 417nm) modulators. Possibilities for a full optical setup incorporating generation and recombination of frequency-stabilized cooling beams are briefly discussed, as are the prospects for future atomic beam collimation experiments.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available