Atom Optics (Technical Application of Laser Cooling)

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We have worked in three areas of atom optics. (1)The development of atom optics components by Shimizu's group, (2)the study of atom chips with Rb BEC by Nakagawa's group, and (3)atom interferometries by Morinaga's group. (1) Various components were demonstrated by using an ultra-cold metastable neon atomic beam. The focusing of an atomic beam with a static electric lens, arbitrary patterning of an atomic beam with a transmission type hologram made of SiN thin film were demonstrated. By depositing electrodes on the hologram of the SiN film we demonstrated real time control of holographic image of atoms. The group also experimentally verified quantum reflection on a solid surface for the first time. Furthermore, they found mat the reflectivity can be improved remarkably by modifying me slid surface. This result was applied to make a reflective type hologram, beam splitter and one dimensional focusing lens. (2) Nakagawa's group developed a rubidium BEC (the third in this country). Loading of atoms from BEC in mind, they constructed an atom chip consisting of miniature wires carrying current to guide and trap atoms. Preliminary experiment of loading laser cooled atoms was verified. The group also worked on a rubidium atom interferometer that is aimed to measure gravity G constant. (3) Morinaga's group studied on a thermal calcium atom interferometer and a laser cooled sodium atom interferometer. With calcium they measured Aharonov-Casher phase shift with an accuracy better than 3%. With sodium they demonstrated time-domain multiple interferometer that had a finesse better than 100.