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Title: Repump methods for magneto optically trapped calcium atoms
Author: Burrows, Christopher
Awarding Body: University of Strathclyde
Current Institution: University of Strathclyde
Date of Award: 2012
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This thesis presents work done on the calcium magneto optic trap experiment at the University of Strathclyde. The apparatus used to cool and trap ~ 10⁶ - 10⁷ ⁴⁰Ca atoms is summarised within. Results pertaining to the 672 nm repump laser are presented. The laser is used to increase the number of detected trapped atoms by more than an order of magnitude. A rate equation model used to simulate the behaviour of the repumped MOT is introduced. It is also used to detect some of the naturally occurring calcium isotopes (and their frequency shifts), 42,44,48Ca, the latter of which has less than 0:2% natural abundance. Expected isotope shifts for three other isotopes, 41,43,46Ca, are calculated. Work carried out on the 1530 nm repump laser is presented. Alterations to the rate equation model are presented. When used in conjunction with the 672 nm laser, the 1530 nm laser increases the number of detected trapped atoms by an extra 20-40% over and above the increase due to the 672 nm laser. The lifetime of atoms trapped in the ³P₂ level is experimentally determined. Work carried out on a 1530 nm bre amplifer is presented, showing that increased power has little effect. The design, construction and testing of an interference filter based external cavity diode laser is presented, along with measurements made of the 370 HZ intercombination line 4s² ¹S₀-4s4p ³P₁. Explanations for the broader linewidths seen are offered.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available