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Narrow linewidth lasers to drive narrow Ba+ ion transitions

Meijknecht, T. (2017) Narrow linewidth lasers to drive narrow Ba+ ion transitions. Master's Thesis / Essay, Physics.

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Precision measurements on atomic parity violation (APV) can be conducted using narrow optical transitions in the Barium ion. Narrow linewidth lasers are essential for the success of such experiments. For this purpose we use a Pound-Drever-Hall locking scheme for stabilizing the frequency of a diode laser, operated at 785 nm, to a Fabry Perot cavity. Electronics employed for feedback plays an important part. We explored two viable options for fast feedback, a FET controlled fast current bypass and a bias T. Laser frequency drifts at slow time scales are reduced by stabilizing the length of the optical cavity using light from an optical frequency comb. The diode laser linewidth could be reduced to 10 kHz, which is sufficient to measure APV. Laser frequency drift could be reduced to below 10 kHz/s using an optical frequency comb.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Physics
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 08:28
Last Modified: 15 Feb 2018 08:28

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