@article{2017-robens-alberti-opt-lett-v42-p1043,
	Abstract = {<p>
	We have designed, built, and characterized a high- resolution objective lens that is compatible with an ultra-high vacuum environment. The lens system ex- ploits 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 &mu;m. 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 of a high NA optical system. From the point spread function, we infer the wavefront aberration for the entire field of view of about 75 &mu;m. Pushing the NA of an optical system to its ultimate limit enables novel applications in quantum technolo- gies such as quantum control of atoms in optical mi- crotraps with an unprecedented spatial resolution and photon collection efficiency.</p>},
	Author = {Robens, C. AND Brakhane, S. AND Alt, W. AND Kleißler, F. AND Meschede, D. AND Moon, G. AND Ramola, G. AND Alberti, A.},
	Journal = {Opt. Lett.},
	Pages = {1043},
	Title = {{High numerical aperture (NA = 0.92) objective lens for imaging and addressing of cold atoms}},
	Volume = {42},
	Year = {2017}
}