发表机构
McDonald Observatory, The University of Texas at Austin（麦克唐纳天文台，德克萨斯大学奥斯汀分校）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文为HET-HRS升级设计静态大气色散校正器与双扰模器，降低残余色散至0.42角秒内，改善光纤耦合与照明均匀性，提升系统光学性能。
AI 中文摘要
霍比-埃伯利望远镜高分辨率光谱仪（HET-HRS）正在进行一项重大仪器升级，以提升其在360-1000纳米波长范围内的性能。作为该工作的一部分，开发了一套新的光纤馈送系统，以提高吞吐量并增强照明稳定性。本文介绍了升级后的HRS输入头模块封装和基于透镜的双扰模器的光学及光机设计。输入头包含一个静态大气色散校正器（ADC）和针对HET运行天顶角范围优化的中继光学元件，将残余大气色散降低至小于0.42角秒，同时改善波长相关的光纤耦合。针对260微米和320微米科学光纤分别开发了双扰模器设计，以交换近场和远场照明分布。几何图像分析表明，在两种光纤几何结构下，近场和远场照明稳定，耦合损耗降低，且角度接受度可接受。还介绍了支持输入头和双扰模器的光机设计，以提供升级后光纤馈送系统所需的对准精度和机械稳定性。这些结果确立了所提出的架构作为提升HET-HRS光学性能和照明稳定性的实用解决方案。
英文摘要
The Hobby--Eberly Telescope High Resolution Spectrograph (HET--HRS) is undergoing a major instrument upgrade to improve its performance over the 360--1000 nm wavelength range. As part of this effort, a new fiber-feed system has been developed to increase throughput and enhance illumination stability. This paper presents the optical and opto-mechanical designs of the upgraded HRS Input Head Module Package and lens-based Double Scramblers. The Input Head incorporates a static Atmospheric Dispersion Corrector (ADC) and relay optics optimized for the HET operational zenith-angle range, reducing the residual atmospheric dispersion to less than 0.42 arcsec while improving wavelength-dependent fiber coupling. Separate Double Scrambler designs were developed for the 260 \textmu m and 320 \textmu m science fibers to exchange the near-field and far-field illumination distributions. Geometrical image analyses demonstrate stable near-field and far-field illumination, reduced coupling losses, and acceptable angular acceptance across both fiber geometries. The opto-mechanical designs supporting the Input Head and Double Scrambler are also presented to provide the alignment accuracy and mechanical stability required for the upgraded fiber-feed system. These results establish the proposed architecture as a practical solution for improving the optical performance and illumination stability of HET--HRS.
