天文学中用于OH抑制滤光片的无热封装 第1部分：设计
Athermal package for OH suppression filters in astronomy part 1: design
AI总结：
本研究针对地基近红外望远镜用OH抑制FBG滤光片的温度敏感问题，提出完整无热封装设计方法，通过测试光纤特性、验证无热响应并结合FEA分析，实现40K温度范围内亚皮米级波长稳定。
摘要：
我们提出了一种无热封装的设计方案，该封装适用于本研究所制造的、用于地基近红外（NIR）望远镜的光纤布拉格光栅（FBG）滤光片。非周期多通道FBG滤光片与光子灯笼相结合，可有效滤除极其明亮的大气羟基（OH）发射线，这些发射线会严重阻碍地基近红外观测。尽管FBG能够高精度地滤除特定波长，但由于其对温度变化敏感，作为OH抑制滤光片的性能表现取决于合适的无热封装——该封装需在约40K的温度范围（即263K至303K）内，将FBG波长与OH发射线波长的偏差维持在亚皮米精度以内。我们的目标是为包含多通道FBG、最大滤光片长度为110mm的光纤，开发上述温度范围内的无热封装。在本研究中，我们展示了此类封装的完整设计方法。首先，我们搭建了定制化测试平台，用于研究光纤的多种关键物理特性，例如应变与温度灵敏度、弹性模量、最佳光纤预张力以及粘附性能。随后，我们利用这些数据验证了粘接在测试平台上的FBG在室温至313K范围内的无热响应。基于此项研究，我们建立了该封装的计算机辅助设计（CAD）模型，并通过有限元分析（FEA），在合理选择材料及其标称尺寸的情况下，分析了其无热特性。最后，我们讨论了该设计的创新之处，这些创新可在目标温度范围内实现这些滤光片的高精度热稳定。
英文摘要：
We present the design of an athermal package for fiber Bragg grating (FBG)filters fabricated at our Institute for use in ground-based near-infrared (NIR) telescopes. Aperiodic multichannel FBG filters combined with photonic lanterns can effectively filter out extremely bright atmospheric hydroxyl (OH) emission lines that severely hinder ground-based NIR observations. While FBGs have the capability of filtering specific wavelengths with high precision, due to their sensitivity to temperature variations, the success in their performance as OH suppression filters depends on a suitable athermal package that can maintain the deviations of the FBG wavelengths from that of the OH emission lines within sub-picometer accuracy over a temperature range of about 40 K. (i.e. 263 K to 303 K). We aim to develop an athermal package over the aforementioned temperature range for an optical fiber consisting of multichannel FBGs for a maximum filter length of 110 mm. In this work, we demonstrate the complete design methodology of such a package. First, we developed a custom-built test rig to study a wide range of critical physical properties of the fiber, such as strain and temperature sensitivities, elastic modulus, optimum fiber pre-tension, and adhesion performance.Next, we used these data to confirm the athermal response of an FBG bonded on the test rig from room temperature to 313 K. Based on this study, we developed a computer-aided design (CAD) model of the package and analyzed its athermal characteristics with a suitable selection of materials and their nominal dimensions using finite element analysis (FEA). We finally discuss the novel aspects of the design to achieve high-precision thermal stabilization of these filters in the temperature range of interest.
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