Thesis

Characterisation of grating properties for MOTs at multiple wavelengths and laser cooling Rb on the 5S1/2 - 6P3/2 transition at 420nm

Creator
Rights statement
Awarding institution
  • University of Strathclyde
Date of award
  • 2017
Thesis identifier
  • T14933
Person Identifier (Local)
  • 201573732
Qualification Level
Qualification Name
Department, School or Faculty
Abstract
  • This thesis presents progress towards making a blue magnetic-optical trap (MOT) utilizing a reflective diffraction grating, a 780nm and a 420nm laser. Taking advantage of the narrower line width of the 6P3/2 state, 420nm lasers can theoretically make a factor of 10 colder MOT than those using 780nm ones based on the Doppler limit. However, considering the low capture rate caused by this narrower linewidth, 87Rb atoms are planned to be captured using a MOT on the 5S1/2 - 5P3/2 transition at 780nm for pre-cooling and then transferred to a MOT on the 5S1/2 - 6P3/2 transition at 420nm. As the very first group intending to make a 420nm grating-MOT, we studied the behaviour (diffraction efficiency, polarisation efficiency) of diffraction gratings with different etch depth, coating material, duty cycle to find suitable gratings which work for both 780nm and 420 nm. To investigate other potential laser sources, 423nm laser diode samples were tested to explore the possibility of reaching the desired wavelength (420.297 nm) for cooling.
Advisor / supervisor
  • Griffin, Paul
  • Arnold, Aidan
Resource Type
DOI
Date Created
  • 2017
Former identifier
  • 9912620992102996

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file details File 2021-07-02 University of Strathclyde