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RISS 인기검색어
- 검색키워드
- 저자 : Kritsun, Oleg Anton (검색결과 1 건)
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Atom optics with Rydberg states in inhomogeneous electric fields
Kritsun, Oleg Anton State University of New York at Stony Brook 2003 해외박사(DDOD)
Atom optics has become subject of intense investigation in recent years. Control of atomic motion is of great importance in atomic physics and applications like lithography or nanofabrication. Neutral atoms are not affected greatly by magnetic or electric field as they don't have a charge or large magnetic and electric moments. But by exciting a neutral atom to a high Rydberg state it is possible to increase its electric moment considerably. The purpose of this thesis is to demonstrate experimentally and theoretically the possibility of creating atom optical elements for the beam of neutral atoms based on the polarizability of highly excited states in an electric field. First this work will present a review of the basic concepts that are used for atom optics and also a discussion of the progress to date in realizations of the neutral atom manipulation techniques. In our earlier experiments deflection and beam-splitting was demonstrated for a beam of neutral Lithium atoms excited in a three-step scheme [3.5, 3.6]. In later experiments, metastable Helium was excited from 23S state to the 33P state using lambda = 389 nm light, and then to the 25--30 S or D states using lambda = 785--815 nm light. Because this was a two-step excitation and it had the higher laser power in the last step, this method increased the percentage of excited atoms by a factor close to 103 compared to the Lithium experiment. Furthermore coherent excitation technique, Stimulated Raman Adiabatic Population Transfer (STIRAP), is investigated in this system, which allows a complete transfer of the atoms from 23S to the Rydberg states. STIRAP is also very tolerant of experimental imperfections such as intensity and frequency fluctuations, Doppler shifts, etc. and can be done with modest laser power. Efficient excitation enables us to do the following atom manipulations in inhomogeneous electric field [3.6, 4.42]. (1) Deflection and reflection; (2) Beam-splitting; (3) Collimation and focusing. Since this field is relatively new there is still a great deal to be learned, and many of the experimental techniques discussed as well as the research that was done represent the earliest work in this field. As research continues, it is likely that more innovations will be forthcoming, and the full potential of the technique will be realized.
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