Sirvi Autor "Del Frate, Alexander" järgi

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3D free-form optical lens — miniaturised fibre couplers for astrophotonics
(2025) Mu, Haoran; Smith, Daniel; Katkus, Tomas; Le, Nguyen Hoai An; Stonyte, Dominyka; Gailevičius, Darius; Kapsaskis, Dan; Del Frate, Alexander; Singh Bedi, Talwinder; Narbutis, Donatas; Anand, Vijayakumar; Astrauskyte, Darija; Grineviciute, Lina; Ng, Soon Hock; Glazebrook, Karl; Lawrence, Jon; Juodkazis, Saulius
In astronomy, multi-object spectrographs employ fibre positioning robots to couple the light from multiple astronomical sources (stars or galaxies) into multiple multi-mode fibres, which are distributed across the focal plane of the telescope. These fibres transport the celestial light to the entrance slit of a spectrograph (or bank of spectrographs) for analysis. For any multi-object system, mm-scale opto-mechanical solutions are required to couple the telescope light efficiently into the fibre. We demonstrate a unique micro()-optics solution to replace current optical fibre couplers. Specifically, we target technology on board the Keck telescope’s FOBOS - Fibre-Optic Broadband Optical Spectrograph — which operates at UV to IR spectral ranges. For spectrally broadband UV-IR band operation, we use glass and crystals: fused silica, crystalline quartz (transparency ), sapphire Al2O3 (), CaF (), and BaF (). The miniaturised -coupler is monolithic, with the entire light path contained within glass or crystal, seamlessly extending to the fibre entrance, which is laser-machined and precisely aligned with the optical axis.