3D Free-Form Optical Lens -- Miniaturised Fibre Couplers for Astrophotonics
| Autor: | Mu, Haoran, Smith, Daniel, Katkus, Tomas, Le, Nguyen Hoai An, Stonyte, Dominyka, Gailevicius, Darius, Kapsaskis, Dan, Del Frate, Alexander, Bedi, Talwinder Singh, Narbutis, Donatas, Anand, Vijayakumar, Astrauskyte, Darija, Grineviciute, Lina, Ng, Soon Hock, Glazebrook, Karl, Lawrence, Jon, Juodkazis, Saulius |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | In astronomy, multi-object spectrographs employ fibre positioning robots to couple the light from multiple astronomy 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 broad UV-IR band operation we use glass and crystals: fused silica, crystalline quartz (transparency 0.16 - 2 micrometers), sapphire Al2O3 (0.2 - 5 micrometers), CaF2 (0.2-7 micrometers), and BaF2 (0.2-10 micrometers). The miniaturised micro-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. Comment: 18 pages 11 figures (main text) |
| Databáze: | arXiv |
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