| 研究生: |
何泓儒 Ho, Hung-Ju |
|---|---|
| 論文名稱: |
暗區自發力光阱的架設與最佳化 Setup and Optimization of Dark Spontaneous-force Optical Trap |
| 指導教授: |
陳泳帆
Chen, Yong-Fan |
| 學位類別: |
碩士 Master |
| 系所名稱: |
理學院 - 物理學系 Department of Physics |
| 論文出版年: | 2011 |
| 畢業學年度: | 99 |
| 語文別: | 中文 |
| 論文頁數: | 59 |
| 中文關鍵詞: | 磁光陷阱 、暗區自發力光阱 、光學密度 |
| 外文關鍵詞: | Magneto-optical trap (MOT), dark spontaneous-force optical trap (SPOT), Optical Density |
| 相關次數: | 點閱:144 下載:2 |
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在這個工作中,我們研究並最佳化一暗區自發力光阱。首先,我們建造一銣原子磁光陷阱,藉由最佳化其陷阱雷射光的頻率及磁場梯度,可捕捉到最佳原子數量為 2 × 10^8 顆。為了進一步提高冷銣原子團密度以增加雷射光與原子團的交互作用,我們在回幫浦雷射光束中心產生一空間暗區,降低原子之間的光散射力,此即為暗區自發力光阱。經由量測冷銣原子團的光學密度,相對於磁光陷阱,此暗區自發力光阱的光學密度約有兩倍的提昇。目前在暗區自發力光阱中我們所量測到最大的光學密度約為 6.6。
In this work, we study and optimize a dark spontaneous-force optical trap (SPOT). At the first, we setup a Rubidium magneto-optical trap (MOT). By optimizing the trapping laser frequency and the magnetic field gradient, the maximum number of the cold atoms trapped in the MOT is about 2 × 10^8. In order to increase the density of the cold atomic cloud, we further setup a SPOT to reduce the rescattering force of the trapping laser by making a spatial dark spot on the repumping laser beam. In the present experiment, the optical density in the SPOT is about twofold increment compared with the MOT. The maximum optical density in the SPOT is about 6.6.
[1] Steven Chu, L. Hollberg, J. E. Bjorkholm, Alex Cable, and A. Ashkin, Phys. Rev. Lett. 55, 48 (1985).
[2] E. L. Raab, M. Prentiss, Alex Cable, Steven Chu, and D. E. Pritchard, Phys. Rev. Lett. 59, 23 (1987).
[3] H. J. Lee, C. S. Adams, M. Kasevich, and S. Chu, Phys. Rev. Lett. 76, 2658 (1996).
[4] C. Salomon, J. Dalibard, W. D. Phillips, A. Clairon and S. Guellati, Europhys. Lett. 12, 683 (1990)
[5] Greg P. Kochanski, John M. Doyle, Naoto Masuhara, Daniel Kleppner, and Thomas J. Greytak, Phys. Rev. Lett. 59, 672 (1987).
[6] K. B. Davis, M, -O. Mewes, M. R. Andrews, N. J. van Druten, D. S. Durfee, D. M. Kurn, and W. Ketterle, Phys. Rev. Lett. 75, 3969 (1995).
[7] W. Ketterle, Kendall B. Davis, Michael A. Joffe, Alex Martin, and David E. Pritchard, Phys. Rev. Lett. 75, 2253 (1993).
[8] Daniel Adam Steck, Rubidum 87 D Line Data, Available online at
http://steck.us/alkalidata/.
[9] W. Demtroder, Laser spectroscopy: basic concepts and instrumentation, 2nd ed, Springer, New York, 1996.
[10] T. A. Savard, K. M. O’Hara, and J. E. Thomas, Phys. Rev. A 56, R1095 (1997).
[11] C. J. Foot, Atomic Physics, Oxford University Press, USA, 2005.
[12] Ying-Cheng Chen, Wen-Bin Lin, Hsuin-Chia Hsue, Long Hsu and Ite A. Yu, Chinese J. Phys. 38, 920 (2000).
[13] Ying-Cheng Chen, Yean-An Liao, Long Hsu, and Ite A. Yu, Phys. Rev. A. 64, 031401 (2001).
[14] J. P. Gordon, A. Ashkin, Phys. Rev. A 21, 1606 (1980).
[15] J. Dalibard, and C. Cohen-Tannoudji, J. Opt. Soc. Am. B 2, 1707 (1985).