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# Numerical Study of Periodic Adiabatic Rapid Passage Sequences

 dc.contributor.advisor Metcalf, Harold en_US dc.contributor.author Zhang, HE en_US dc.contributor.other Department of Physics en_US dc.date.accessioned 2017-09-20T16:50:56Z dc.date.available 2017-09-20T16:50:56Z dc.date.issued 2015-12-01 en_US dc.identifier.uri http://hdl.handle.net/11401/76670 en_US dc.description 86 pg. en_US dc.description.abstract Laser cooling refers to the techniques that cool atomic and molecular samples down to near absolute zero through the interaction with laser fields. Atoms absorb a photon and the transferred momentum generates force to lower the atom's velocity. The Doppler shift is associated with the motion of the atom, in which a moving atom always observes a slightly different frequency than the laser at rest. Based on the two-level system theory, this thesis studied the process of multiple sequences of adiabatic rapid passage by simulating the process of the interaction between optical forces and helium atoms. By studying the force map in parameter space, trying to understand the relationship between the average force and relevant laser parameters $\Omega_0$ and $\delta_0$ in the Rabi frequency. Furthermore, we studied the relationship between the average force and velocity by comparing the dragged atom model and moving atom model. We also studied the process of multiple sequences of adiabatic rapid passage by changing spontaneous emission, sweep range, pulse number for the interaction, exploring the distance between peaks that appear in the velocity distribution. The observational results will be presented in the thesis as well as the explanation. en_US dc.description.sponsorship This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree. en_US dc.format Monograph en_US dc.format.medium Electronic Resource en_US dc.language.iso en_US en_US dc.publisher The Graduate School, Stony Brook University: Stony Brook, NY. en_US dc.subject.lcsh Atomic physics en_US dc.subject.other Adiabatic Rapid Passage en_US dc.title Numerical Study of Periodic Adiabatic Rapid Passage Sequences en_US dc.type Thesis en_US dc.mimetype Application/PDF en_US dc.contributor.committeemember Schneble, Dominik en_US dc.contributor.committeemember Sehgal, Neelima. en_US
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