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Rb at 780 nm. We experimentally demonstrate a retroreflector with 74% efficiency and 0.85 ellipticity, meeting performance requirements for MOT operation. The grating coupler is characterized through full-wave electromagnetic simulations, showing 20% out-coupling efficiency and 0.85 polarization ellipticity. This two-wafer architecture proposed here significantly simplifies alignment and maintains a compact, scalable, foundry-compatible footprint for all beam-delivery components.
Wang et al. (Wed,) studied this question.