发表机构
Sydney Institute for Astronomy, School of Physics, The University of Sydney; Sydney Astrophotonics Instrumentation Laboratory, School of Physics, The University of Sydney; Leiden Observatory, Leiden University（悉尼大学物理学院天体物理学研究所; 悉尼大学物理学院天文光子学仪器实验室; 莱顿大学莱顿天文台）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
研究光子灯笼主模正交性及相对相位校准，通过数字离轴全息术分析数据集，发现主模更正交，提出量化指标，还模拟额外测量以利用正交性确定主模相对相位。
AI 中文摘要
光子灯笼能将输入空间模式高效映射到单模输出，用于高角分辨率成像和消零干涉测量等应用。但制造限制使得在设计阶段无法完全控制设备的模式转移矩阵，因此实验表征至关重要。本文进一步分析了一个数据集，该数据集是利用数字离轴全息术在1550nm附近73nm范围内对光子灯笼主模进行的直接测量。通过直接分析电场，发现主模比相同大小空间中的随机向量明显更正交，这与近绝热设备预期相符。我们提出了量化这种效应的指标，指出具有正交主模的模式转换器能提供更好条件的逆求解器。我们还模拟了表征系统可进行的额外测量，利用正交性来确定主模之间的相对相位。
英文摘要
Photonic lanterns efficiently map input spatial modes to single-mode outputs for applications like high angular resolution imaging and nulling interferometry. However, manufacturing limits prevent full control over the device's mode transfer matrix at the design stage, making empirical characterisation essential. In this work we further analyse a dataset of direct measurements of a photonic lantern's principal modes using digital off-axis holography over a 73 nm range near 1550 nm. By analysing the electric field directly, we find that the principal modes are significantly more orthogonal than random vectors in a space of the same size, as expected for near-adiabatic devices. We propose metrics for quantifying this effect, noting that mode converters with orthogonal principal modes provide better conditioned inverse solvers. We also simulate additional measurements that characterisation systems could take, where the orthogonality would be leveraged to determine the relative phase between principal modes.
CommentsProceedings for Optical and Infrared Interferometry and Imaging X (SPIE Astronomical Telescopes + Instrumentation)
