Two-photon laser oscillation by using trapped atoms

利用俘获原子的双光子激光振荡

• 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
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07454091/
• 关键词: Two-Photon Laser; Laser Cooling; Dressed State; Intensity Correlation; Quantum Interference; Precise Spectroscopy; Doughnut-Beam Trap; Bose-Einstein Condensation; 原子トラップ; ボ-ズ凝縮; 磁気光学トラップ; ド-ナツビーム; 電磁光学トラップ; 共振器量子電気力学; レーザー分光; 超微細構造; 四光波混合; Two-Photon Laser; Laser Cooling; Dressed State; Intensity Correlation; Quantum Interference; Precise Spectroscopy; Doughnut-Beam Trap; Bose-Einstein Condensation; 原子トラップ; ボ-ズ凝縮; 磁気光学トラップ; ド-ナツビーム; 電磁光学トラップ; 共振器量子電気力学; レーザー分光; 超微細構造; 四光波混合

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.

我们构建了一个扩展的腔二极管激光系统和一个真空室，用于Rubidium（RB）原子的磁磁陷阱（MOT）。在计算机控制下，激光频率稳定并锁定为rubidium原子的超精细转变。我们在蒸气单元中进行了RB原子的线性和非线性光谱，并观察到 ​​^<85> rb和 ^<87> rb的高精细超级级别的光学转变。光谱分辨率约为6 MHz，由过渡的自然线宽确定。10^8 rb原子被MOT捕获在-1mm^3中。原子密度几乎是BA原子束的100倍，该原子的大小是Ba的原子束，该原子的频率最早用于两光子激光旋转的摩塞仪，并在1992年进行了分配。当我们改变了激光极化和外部磁场的曲折的构型时，观察到了许多光谱。 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.陷阱为原子操纵的简单技术打开了道路，包括气体原子的玻色网凝结。