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Study of Coronagraphic Techniques

机译：日冕技术的研究

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Smithsonian Astrophysical Observatory (SAO) has set up a program to study coronagraphic techniques. The program consists of the development of new fabrication methods of occulter masks, characterization of the manufactured masks, and application of the masks to study speckle reduction technique. Our occulter mask fabrication development utilizes a focused ion beam system to directly shape mask profiles from absorber material. Initial milling trials show that we can shape nearly Gaussian-shaped mask profiles. Part of this development is the characterization of absorber materials, poly(methyl methacrylate) doped with light-stable chromophores. For the characterization of the masks we have built a mask scanner enabling us to scan the transmission function of occulter masks. The real mask transmission profile is retrieved applying the maximum entropy method to deconvolve the mask transmission function from the beam profile of the test laser. Finally, our test bed for studying coronagraphic techniques is nearing completion. The optical setup is currently configured as a classical coronagraph and can easily be re-configured for studying speckle reduction techniques. The development of the test bed control software is under way. This paper we will give an update of the status of the individual program elements.
机译：史密森尼天体物理观测站（SAO）制定了一项研究日冕技术的计划。该程序包括开发掩星掩膜的新制造方法，制造掩膜的特性以及将掩膜用于研究斑点减少技术。我们的掩晶掩膜制造开发利用聚焦离子束系统直接从吸收剂材料中塑造出掩膜轮廓。初步的铣削试验表明，我们可以使形状接近高斯形状的面罩轮廓。这种发展的一部分是吸收剂材料的特性，掺杂有光稳定发色团的聚（甲基丙烯酸甲酯）。为了表征掩膜，我们构建了一个掩膜扫描仪，使我们能够扫描隐蔽掩膜的透射功能。应用最大熵方法检索真实的掩模透射轮廓，以从测试激光器的光束轮廓中解出掩模透射函数。最终，我们用于研究电晕成像技术的测试平台即将完成。光学装置目前配置为经典的日冕仪，可以很容易地重新配置以研究斑点减少技术。测试台控制软件的开发正在进行中。本文我们将提供各个程序元素的状态更新。

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