面向EMARCOT项目的高吞吐量可见光光子灯笼
Towards High-Throughput Visible Photonic Lanterns for the EMARCOT Project
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中文总结 AI 辅助
本文针对EMARCOT项目开发7x1多模光子灯笼，实验评估发现通道均匀性极佳但吞吐量低于4%，归因于折射率失配，为改进制造工艺提供诊断基线。
中文摘要 AI 辅助
光子EMARCOT是一个创新项目，涉及西班牙、德国和澳大利亚的研究机构，旨在利用光子灯笼集成多个光学管组件（OTA）。“探路者”原型配备七个光学管组件，有效孔径为1.1米，将为卡拉尔阿尔托天文台的摄谱仪供光，预计2026年首次开光。我们报告了为此框架开发的定制7x1多模光子灯笼（MMPL）的制造和实验评估，该灯笼具有七个25微米纤芯多模输入，合并为单个50微米纤芯多模输出，针对可见光波长范围（400-700纳米）进行了优化。以600纳米为中心的光学表征显示出卓越的通道间均匀性，在裸光纤和连接器化MMPL配置中，统计变化接近于零。然而，该初始器件的总基线吞吐量被限制在4%以下。根据折射率研究，这种低吞吐量归因于内部光纤包层几何结构与结构毛细管之间的严重折射率失配，这抑制了锥形过渡过程中的全内反射。这项工作建立了一个重要的诊断基线，突出了改进未来高吞吐量制造工艺所需的制造公差，以用于精密径向速度天文学。
英文摘要
Photonic EMARCOT is an innovative project involving Spanish, German and Australian research institutes that aims to integrate multiple Optical Tube Assemblies (OTAs) using photonic lanterns. The "Pathfinder" prototype, featuring seven OTAs with a 1.1-meter effective aperture, will feed a spectrograph at the Calar Alto Observatory, with first light expected in 2026. We report the fabrication and experimental evaluation of a custom 7x1 multi-mode photonic lantern (MMPL) developed for this framework, featuring seven 25 um core multi-mode inputs merging into a single 50 um core multi-mode output optimized for the visible wavelength range (400-700 nm). Optical characterization centered at 600 nm reveals exceptional channel-to-channel uniformity, with statistical variations close to zero across both bare-fiber and connectorized MMPL configurations. However, the total baseline throughput of this initial device was limited to below 4%. From the refractive index studies, this low throughput is attributed to severe refractive index mismatch between the internal fiber cladding geometry and the structural capillary, which suppresses total internal reflection during the tapering transition. This work establishes an important diagnostic baseline that highlights the necessary fabrication tolerances needed to improve future high-throughput manufacturing processes for precision radial-velocity astronomy.
发表机构
- Leibniz-Institut für Astrophysik Potsdam (AIP)（波茨坦阿基米德天体物理研究所）
- Instituto de Astrofísica de Andalucía, Consejo Superior de Investigaciones Científicas（安达卢西亚天体物理研究所，西班牙高等科学研究委员会）
- Centro Astronómico Hispano en Andalucía (CAHA), Observatorio de Calar Alto（安达卢西亚西班牙天文中心，卡萨拉托天文台）
- Institute of Photonics and Optical Science, School of Physics, University of Sydney（悉尼大学物理学院光子学与光学科学研究所）
机构由 AI 辅助整理，请以论文原文为准。
