Selective Laser-induced Etching (SLE) is a manufacturing process which enables the fabrication of three-dimensional parts from transparent materials with unique freedom of geometry and high precision. First, the outer contour of the part is inscribed in the material using focused ultrashort pulsed laser radiation. Second, the modified design is exposed from the bulk material using wet chemical etching. We analyze the possibility of using SLE for the machining of next generation fused silica ion traps suitable for quantum computing. Such ion traps require an enhanced functionality in combination with reduced error sources and a reproducible manufacturing process. Ion trap designs with three-dimensional features in the micrometer regime are developed to meet these requirements. Challenges of the SLE process arising from the ion trap design and its dimensions are discussed. Different process strategies to fabricate single ion trap components as well as complete ion traps are examined. We demonstrate that next generation ion traps can be machined using SLE and outline the way towards a fabrication on wafer level.
We demonstrate nanoscopic transmission microscopy, using a deterministic single particle source, and compare the resulting images in terms of signal-to-noise ratio with those of conventional Poissonian sources. Our source is realized by deterministic extraction of laser-cooled calcium ions from a Paul trap. Gating by the extraction event allows for the suppression of detector dark counts by six orders of magnitude. Using the Bayes experimental design method, the deterministic characteristics of this source are harnessed to maximize information gain, when imaging structures with a parametrizable transmission function. We demonstrate such optimized imaging by determining parameter values of one and two dimensional transmissive structures.
We have constructed a frequency synthesis chain in order to compare the 1s2s Hydrogen transition (Lyman-(alpha) , 2466 THz) with the Methane stabilized He-Ne-laser at 88,4 THz. Phaselocks for all transfer oscillators have been established. The 88 THz line serves as a secondary frequency standard, currently operating at an absolute reproducibility of 2 X 10-12 and a stability of 10-13 at 10 - 100 s integration time. We report on the transfer of this precision to the Lyman-(alpha) frequency of the hydrogen atom, which yields an improved value of the Rydberg constant.
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