Robens Carsten, Brakhane Stefan, Alt Wolfgang, Kleißler Felix, Meschede Dieter, Moon Geol, Ramola Gautam, Alberti Andrea
Opt Lett. 2017 Mar 15;42(6):1043-1046. doi: 10.1364/OL.42.001043.
We have designed, built, and characterized a high-resolution objective lens that is compatible with an ultrahigh vacuum environment. The lens system exploits the principle of the Weierstrass sphere solid immersion lens to reach a numerical aperture (NA) of 0.92. Tailored to the requirements of optical lattice experiments, the objective lens features a relatively long working distance of 150 μm. Our two-lens design is remarkably insensitive to mechanical tolerances in spite of the large NA. Additionally, we demonstrate the application of a tapered optical fiber tip, as used in scanning near-field optical microscopy, to measure the point spread function (PSF) of a high NA optical system. From the PSF, we infer the wavefront aberration for the entire field of view of about 75 μm. Pushing the NA of an optical system to its ultimate limit enables novel applications in quantum technologies such as quantum control of atoms in optical microtraps with an unprecedented spatial resolution and photon collection efficiency.
我们设计、制造并表征了一种与超高真空环境兼容的高分辨率物镜。该透镜系统利用魏尔斯特拉斯球固体浸没透镜原理，数值孔径（NA）达到0.92。根据光晶格实验的要求定制，该物镜具有150μm的相对较长工作距离。尽管数值孔径很大，但我们的双透镜设计对机械公差非常不敏感。此外，我们展示了扫描近场光学显微镜中使用的锥形光纤尖端在测量高数值孔径光学系统点扩散函数（PSF）方面的应用。从点扩散函数中，我们推断出约75μm整个视场的波前像差。将光学系统的数值孔径推至其极限，可实现量子技术中的新应用，如以空前的空间分辨率和光子收集效率对光学微阱中的原子进行量子控制。
