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• W2182758987 abstract "In this thesis we report on the realization of a Bose-Einstein condensate (BEC) using a simple all-optical method in a crossed dipole trap formed by a 1 μm laser. We also briefly describe the experiments performed regarding the coherent manipulation of atomic matter waves. These experiments were performed on an atom chip based BEC which was already existing in the lab. In the coherent manipulation of atomic matter wave experiments we used standing wave pulses in the Raman-Nath regime to manipulate the BEC. Firstly, we investigated a novel method to realize analog sum computation with a BEC in an optical lattice potential subjected controlled phase jumps. We showed that Gauss sum algorithm for factoring numbers could be implemented using this method. In another experiment we showed that the energy of the atoms subjected to optical pulses with increasing noise shows resonant behavior in opposition to the usual expectation that noise drives a quantum system to classical limit. Additionally, we used similar methods to demonstrate a proof of principle signal analysis with atom optics. For the purpose of all-optical realization of Rb BEC we constructed a double MOT experimental chamber to realize a large number of laser cooled atoms and high vacuum simultaneously. We could achieve a transfer rate of 10 atoms/s from the first MOT chamber to the second MOT chamber. We initially used a multimode laser of 1μm wavelength for dipole trap. We found that the life time of the trapped atoms in this laser was only 3 s at a maximum power of 19 W. We realized that the laser consisted of closely spaced modes with a spacing of about 6 MHz thus making it highly likely for a stimulated Raman process to occur between the ground state levels of Rb. As a result hyperfine changing collisions dominated, and atoms gained enough energy i" @default.
• W2182758987 created "2016-06-24" @default.
• W2182758987 creator A5019568473 @default.
• W2182758987 date "2012-01-01" @default.
• W2182758987 modified "2023-09-26" @default.
• W2182758987 title "All Optical Realization of Bose-Einstein Condensation in a Near-Infrared Laser Trap" @default.
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• W2182758987 hasPublicationYear "2012" @default.
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