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Two-photon laser oscillation by using trapped atoms

利用俘获原子的双光子激光振荡

基本信息

批准号：
07454091
负责人：
KUGA Takahiro
金额：
$ 4.22万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

We constructed an extended-cavity diode laser system and a vacuum chamber for the magneto-optical trap (MOT) of rubidium (Rb) atoms. The laser frequency was stabilized and locked to a hyperfine transition of rubidium atom under the computer control.We performed linear and non-linear spectroscopies of Rb atoms in a vapor cell and observed optical transitions between hyperfine sublevels of ^<85>Rb and ^<87>Rb. Spectral resolution was about 6 MHz and was determined by the natural linewidth of the transitions.About 10^8 Rb atoms were trapped in - 1mm^3 by the MOT.The atomic density was almost 100 times as large as that of the atomic beam of Ba which was first used for the two-photon laser oscillation by Mossberg in 1992. We also performed a non-linear spectroscopy with the trapped Rb atoms and many kinds of spectra were observed when we changed the configuration of laser polarizations and strehgth of the external magnetic field. These spectra were well explained by the dressed-atom picture.Ultracold Rb atoms (- 10muK) were obtained when we applyed a polarization gradient cooling to pre-cooled atoms in the MOT.By using a dark MOT,we further increased the atomic density by 50 % form the density obtained by the normal MOT.We developed a novel all-optical trap for neutral atoms by using a doughnut beam. The trap opens the way to a simple technique for atom manipulation, including Bose-Einstein condensation of gaseous atoms.

我们构建了一个用于铷原子磁光阱（MOT）的扩展腔二极管激光系统和真空室。在计算机控制下，激光频率稳定并锁定在铷原子的超精细跃迁上。我们在蒸汽池中对Rb原子进行了线性和非线性光谱分析，并观察到^<85>Rb和^<87>Rb超精细亚能级之间的光学跃迁。光谱分辨率约为6 MHz，由过渡的自然线宽决定。大约10^8个Rb原子被MOT捕获在- 1mm^3中。原子密度几乎是1992年Mossberg首次用于双光子激光振荡的Ba原子束的100倍。我们还对捕获的Rb原子进行了非线性光谱分析，当我们改变激光极化配置和外磁场强度时，我们观察到多种光谱。这些光谱可以用修饰原子图很好地解释。对MOT中的预冷原子进行极化梯度冷却，得到了超冷Rb原子（- 10muK）。通过使用暗MOT，我们进一步将原子密度提高了正常MOT密度的50%。我们利用甜甜圈光束开发了一种新颖的中性原子全光阱。这个陷阱为一种简单的原子操纵技术开辟了道路，包括气态原子的玻色-爱因斯坦凝聚。