Degree Year

2013

Document Type

Thesis

Degree Name

Bachelor of Arts

Department

Physics and Astronomy

Advisor(s)

Jason Stalnaker

Keywords

Lithium spectroscopy, Spectroscopy, Frequency comb, High precision measurement, Doppler-free saturated fluorescence spectroscopy, Fluorescence spectroscopy, Stabilized frequency comb, Lithium D1 D2

Abstract

The lineshapes of the D1 (22S1/2 → 22P1/2 ) and D2 (22S3/2 → 22P1/2) transitions in lithium were measured using a diode laser that was frequency-stabilized to a Ti:Sapphire 1 GHz optical frequency comb. The excitation was achieved by retroreflecting the diode laser, in effect producing the Doppler-free profiles for the center frequencies of transitions. The observed spectra were compared to density matrix calculations to gain insight into systematic effects including the dependence of Doppler-free profiles on power and polarization angle of the diode. For certain transitions, the method of saturated fluorescence spectroscopy inevitably leads to the presence of extra resonances known as crossover signals. Our preliminary data suggest that the presence of this complicating effect may render saturated fluorescence spectroscopy an ineffective technique for resolution of transitions whose relative separation is on the order of the natural linewidth of Li.

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