This research images trapped atoms in three dimensions, utilizing light field imaging. Such a system is of interest in the development of atom interferometer accelerometers in dynamic systems where strictly defined focal planes may be impractical. In this research, a light field microscope was constructed utilizing a Lytro Development Kit micro lens array and sensor. It was used to image fluorescing rubidium atoms in a magneto optical trap. The three-dimensional (3D) volume of the atoms is reconstructed using a modeled point spread function (PSF), taking into consideration that the low magnification (1.25) of the system changed typical assumptions used in the optics model for the PSF. The 3D reconstruction is analyzed with respect to a standard off-axis fluorescence image. Optical axis separation between two atom clouds is measured to a 100 mu m accuracy in a 3 mm deep volume, with a 16 mu m in-focus standard resolution with a 3.9 mm by 3.9 mm field of view. Optical axis spreading is observed in the reconstruction and discussed. The 3D information can be used to determine properties of the atom cloud with a single camera and single image, and can be applied anywhere 3D information is needed but optical access may be limited.
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机译:该研究在三维捕获原子,利用光场成像。这种系统对动态系统中的原子干涉仪加速度计的发展感兴趣,其中严格定义的焦平面可能是不切实际的。在该研究中,利用Lytro开发套件微透镜阵列和传感器构建了一种光场显微镜。它用于在磁光阱中成像荧光铷原子。使用建模点扩展功能(PSF)重建原子的三维(3D)体积,考虑到系统的低放大率(1.25)改变了PSF的光学模型中使用的典型假设。关于标准偏离轴荧光图像分析3D重建。两个原子云之间的光轴分离在3 mm深度的3mm的尺寸下测量为100 mu m,具有16μm的焦点标准分辨率,3.9 mm的视野。在重建中观察到光轴扩散并讨论。 3D信息可用于确定具有单个摄像机和单个图像的原子云的特性,并且可以应用于所需的3D信息,但是可以限制光学访问。
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