大模径交叉光学腔
Crossed optical cavities with large mode diameters
摘要：
我们报道了一种紧凑的超高真空兼容光学组件，用于制作大规模的二维光晶格，用于超冷原子的实验。该组件由一个由超低膨胀玻璃制成的八角形间隔物组成，我们将四个熔融石英腔镜与之光学接触，使其具有高度的机械和热稳定性。反射镜表面几乎是平面平行的，这允许我们创建两个垂直的腔模式与直径$\sim$ 1 mm。这种大的模式直径是期望的，以增加光晶格的均匀性，但导致两个腔模式之间的共面性的强的角度敏感性。我们展示了一个程序，以精确地定位每个镜基板，实现了$d = 1(5)$ $μ$ m的共面性的偏差。在任意可见光和近红外波长处产生大的光晶格需要显著的功率增强以克服可用激光功率的限制。腔镜具有定制的低损耗镜面涂层，可将从可见光到近红外的一组相关波长的功率提高多达三个数量级。
英文摘要：
We report on a compact, ultrahigh-vacuum compatible optical assembly to create large-scale, two-dimensional optical lattices for use in experiments with ultracold atoms. The assembly consists of an octagon-shaped spacer made from ultra-low-expansion glass, to which we optically contact four fused-silica cavity mirrors, making it highly mechanically and thermally stable. The mirror surfaces are nearly plane-parallel which allows us to create two perpendicular cavity modes with diameters $\sim$1 mm. Such large mode diameters are desirable to increase the optical lattice homogeneity, but lead to strong angular sensitivities of the coplanarity between the two cavity modes. We demonstrate a procedure to precisely position each mirror substrate that achieves a deviation from coplanarity of $d = 1(5)$ $μ$m. Creating large optical lattices at arbitrary visible and near infrared wavelengths requires significant power enhancements to overcome limitations in the available laser power. The cavity mirrors have a customized low-loss mirror coating that enhances the power at a set of relevant wavelengths from the visible to the near infrared by up to three orders of magnitude.
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