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arXiv 2106.09162astro-ph.IMphysics.optics
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用于天文望远镜建模的开源高斯波束分解工具

An Open-Source Gaussian Beamlet Decomposition Tool for Modeling Astronomical Telescopes

Jaren N. Ashcraft, Ewan S. Douglas

摘要:

在追求直接成像系外行星的过程中,高对比度成像社区已经开发了多种工具来模拟分段孔径望远镜上日冕仪的性能。随着望远镜规模的增加和科学案例向更短的波长发展,优化高对比度成像仪器所需的物理光学传播在计算上变得令人望而却步。高斯波束分解(GBD)是一种物理光学传播的替代方法,它将任意波前分解为近轴光线。这些光线可以使用ABCD矩阵快速传播,并转换成相应的高斯光束,以准确地模拟物理光学现象,而不需要衍射积分。GBD技术最近在商业软件(例如FRED,CODE V,ASAP)中得到了发展和实现,但似乎缺乏开源平台。我们提出了一个新的GBD工具,在Python中开发的物理光学现象建模,其目标是减轻复杂的孔径,多元素系统建模的计算负担,并引入模型失调误差的能力。这项研究表明,GBD技术所利用的光学的几何和物理制度的协同作用,是出于需要推进开源物理光学传播分段孔径望远镜日冕的设计和分析。这项工作说明了GBD与泊松点计算,并显示显着的运行时间优势GBD多元素系统的菲涅尔传播。

英文摘要:

In the pursuit of directly imaging exoplanets, the high-contrast imaging community has developed a multitude of tools to simulate the performance of coronagraphs on segmented-aperture telescopes. As the scale of the telescope increases and science cases move toward shorter wavelengths, the required physical optics propagation to optimize high-contrast imaging instruments becomes computationally prohibitive. Gaussian Beamlet Decomposition (GBD) is an alternative method of physical optics propagation that decomposes an arbitrary wavefront into paraxial rays. These rays can be propagated expeditiously using ABCD matrices, and converted into their corresponding Gaussian beamlets to accurately model physical optics phenomena without the need of diffraction integrals. The GBD technique has seen recent development and implementation in commercial software (e.g. FRED, CODE V, ASAP) but appears to lack an open-source platform. We present a new GBD tool developed in Python to model physical optics phenomena, with the goal of alleviating the computational burden for modeling complex apertures, many-element systems, and introducing the capacity to model misalignment errors. This study demonstrates the synergy of the geometrical and physical regimes of optics utilized by the GBD technique, and is motivated by the need for advancing open-source physical optics propagators for segmented-aperture telescope coronagraph design and analysis. This work illustrates GBD with Poisson's spot calculations and show significant runtime advantage of GBD over Fresnel propagators for many-element systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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