| Project/Area Number |
10640389
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
物理学一般
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| Research Institution | Keio University |
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Principal Investigator |
SASADA Hiroyuki Faculty of Science and Technology, Department of Physics, Keio University, Associate Professor, 理工学部, 助教授 (30146576)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1999: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1998: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | laser cooling / Laguerre Gauss optical beam / optical trap / レーザークーリング / ラゲールガウスビーム / 原子操作 / 光ポテンシャル |
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| Research Abstract |
In 1998, we have constructed E experimental setup for laser cooling, and succeeded to confine ィイD185ィエD1Rb and ィイD187ィエD1Rb atoms in a magneto-optical trap. We have used an external cavity diode laser as a light source, and the laser frequency is servo locked to the saturated absorption spectral line of Rb. The laser light stopped a slow part of atoms moving in a thermal velocity in a glass cell. The attained temperature was about 100 mK, and the number of the trapped atoms was 1.2 x 10ィイD17ィエD1 corresponding to the number density of 8 x 10ィイD110ィエD1 particle/cmィイD13ィエD1.
In 1999, we have improved the apparatus Ed experimental environment. To measure the temperature and density of the trapped atoms precisely, we have made an imaging system controlled by a personal computer. An air conditioner was installed in our laboratory, thus we can operate the external cavity diode laser in any season. We also add some vacuum valves between pumps and main chamber in order to prevent the Rb atoms from attacking the pump surface. We have not trapped the atoms in a Laguerre Gauss beam yet, but are very close to it.
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