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題名 | 無自旋交換鬆弛銣原子磁力計之研製=Fabrication of Spin-exchange-relaxation-free Rubidium Atomic Magnetometer |
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作者 | 李鍾嵐; 蒲念文; 宋鈺; 葛明德; 王定三; 張欽亮; | 書刊名 | 中正嶺學報 |
卷期 | 41:1(A) 2012.05[民101.05] |
頁次 | 頁209-220 |
分類號 | 471.3 |
關鍵詞 | 無自旋交換鬆弛; 銣原子; 光學激發; Spin-exchange-relaxation-free; Rubidium cell; Optical pumping; |
語文 | 中文(Chinese) |
中文摘要 | 在本研究中是以無自旋交換鬆弛(spin-exchange-relaxation-free, SERF)的原理設計建造銣原子磁力計,我們所建造的銣原子磁力計是在高密度銣原子及低磁場環境中的操作條件下,可完全消除因自旋交換鬆弛所造成的影響,將銣原子盒放置於五層磁場屏蔽筒內並以三組電流線圈消除筒內殘餘磁場,加熱至160℃以產生高密度銣蒸氣,並充入2 atm的氦氣及60 Torr的氮氣以減低銣原子與器壁之碰撞頻率,利用兩組可調變波長的二極體雷射操作於銣原子之D1譜線附近作為激發光源及偵測光源,在給予一已知的外加交流磁場強度下,測得不同頻率訊雜比可得到磁力計基本感度約為50 pT/(Hz)1/2。 |
英文摘要 | In this study, we design and build a Rb atomic magnetometer operating in the spin-exchange-relaxation-free (SERF) regime. We demonstrate a Rb magnetometer in which spin-exchange relaxation is completely eliminated by operating at high Rb density and low magnetic field. A Rb cell was put inside a 5-layer magnetic shield, and three current coils were used to eliminate the residual magnetic field in the shield. The Rb cell was filled with 2 atm of He and 60 Torr of N2 to reduce the collisions of Rb atoms with the glass wall in order to avoid relaxation. The cell was heated to 160 to produce a high density Rb vapor. Two tunable diode lasers operating near the Rb D1 ℃line were used for the pump and probe beams. The detection sensitivity determined by signal-to-noise measurements with an applied ac magnetic field of known magnitude was about 50 pT/(Hz)1/2. |
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