Centre for Quantum Computation and Communication Technology, Research School of Physics and Engineering, The Australian National University, Canberra, ACT 2601, Australia.
Institut für Experimentalphysik, Universität Innsbruck, Technikerstr. 25, 6020, Innsbruck, Austria.
Sci Rep. 2018 Jan 9;8(1):221. doi: 10.1038/s41598-017-18637-8.
High precision, high numerical aperture mirrors are desirable for mediating strong atom-light coupling in quantum optics applications and can also serve as important reference surfaces for optical metrology. In this work we demonstrate the fabrication of highly-precise hemispheric mirrors with numerical aperture NA = 0.996. The mirrors were fabricated from aluminum by single-point diamond turning using a stable ultra-precision lathe calibrated with an in-situ white-light interferometer. Our mirrors have a diameter of 25 mm and were characterized using a combination of wide-angle single-shot and small-angle stitched multi-shot interferometry. The measurements show root-mean-square (RMS) form errors consistently below 25 nm. The smoothest of our mirrors has a RMS error of 14 nm and a peak-to-valley (PV) error of 88 nm, which corresponds to a form accuracy of λ/50 for visible optics.
高精度、大数值孔径反射镜在量子光学应用中用于介导强原子-光耦合是非常理想的，同时也可以作为光学计量的重要参考面。在这项工作中，我们展示了数值孔径为 0.996 的高精密半球反射镜的制造。这些反射镜是通过单点金刚石车削用经过原位白光干涉仪校准的稳定超精密车床加工而成的。我们的反射镜直径为 25mm，并用广角单次和小角度拼接多次拍摄干涉测量法的组合进行了特性描述。测量结果显示均方根（RMS）形貌误差始终低于 25nm。我们制造的最光滑的反射镜的 RMS 误差为 14nm，峰谷（PV）误差为 88nm，这对应于可见光的λ/50 的形貌精度。
