The final design of the iLocater spectrograph: an optimized architecture for diffraction-limited EPRV instruments

The final design of the iLocater spectrograph: an optimized architecture for diffraction-limited EPRV instruments
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iLocater 摄谱仪的最终设计：衍射极限 EPRV 仪器的优化架构

DOI：
10.1117/12.2630228
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发表时间：
2022
期刊：
Volume 12184
影响因子：
--
通讯作者：
VanSickle, Michael
VanSickle, Michael
中科院分区：
--
文献类型：
--
作者：
Crass, Jonathan;Aikens, David M.;Mason, Joaquin;King, David L.;Crepp, Justin R.;Bechter, Andrew;Bechter, Eric B.;Farsad, Mahsa;Schwab, Christian;VanSickle, Michael

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iLocater是一个近红外，极精确的径向速度（EPRV）光谱仪，正在为双8.4米直径的大双目望远镜（LBT）建造。该仪器将对围绕低质量恒星运行的类地行星进行精确的径向速度研究。iLocater在衍射限制区工作，使用自适应光学器件将星光有效地直接注入单模光纤，照亮高光谱分辨率（R= 190，500中位数），低温，衍射限制光谱仪。为了最大限度地提高性能，光谱仪使用了一种新的设计策略，EPRV仪器，结合了固有的稳定材料，其光学机械制造与精密光学制造。这种新颖的组合将使独特的EPRV能力的系外行星和天体物理学研究的太阳附近。我们提出了最终的光谱仪系统的光学和机械设计。确保建成的摄谱仪达到其设计的光谱分辨率和衍射限制性能，需要仔细控制端到端系统波前误差（WFE）预算。我们讨论了为实现这一目标所做的努力，包括最大限度地减少光学设计中的残余WFE，评估衍射光栅WFE性能，优化材料选择，以及需要精确的光学设计和制造。我们的目标是在整个光谱格式中提供衍射限制性能，结合EPRV科学的固有热稳定性要求，推动了硅光学器件和因瓦光学机械的选择。系统性能通过精确（亚mK）热控制进一步优化。这组设计功能将使iLocater在近红外范围内实现亚m/s的径向速度精度，并作为EPRV科学的第一个优化的衍射极限光谱仪
iLocater is a near-infrared, extremely precise radial velocity (EPRV) spectrograph under construction for the dual 8.4 m diameter Large Binocular Telescope (LBT). The instrument will undertake precision radial velocity studies of Earth-like planets orbiting low-mass stars. Operating in the diffraction-limited regime, iLocater uses adaptive optics to efficiently inject starlight directly into single-mode fibers that illuminate a high spectral resolution (R=190,500 median), cryogenic, diffraction-limited spectrograph. To maximize performance, the spectrograph uses a new design strategy for EPRV instruments, combining intrinsically stable materials for its optomechanical fabrication with precision optical fabrication. This novel combination will enable unique EPRV capabilities for exoplanet and astrophysics studies of the solar neighborhood. We present the final optical and mechanical designs of the spectrograph system. Ensuring the as-built spectrograph achieves its designed spectral resolution and diffraction-limited performance has required careful control of the end-to-end system wavefront error (WFE) budget. We discuss the efforts undertaken to achieve this goal including minimizing residual WFE in the optical design, assessing diffraction grating WFE performance, optimizing material choices, and requiring precision optical design and fabrication. Our goal is to deliver diffraction-limited performance across the full spectral format, which, combined with intrinsic thermal stability requirements for EPRV science, has driven the selection of silicon optics and Invar optomechanics. The system performance is further optimized using precision (sub-mK) thermal control. This set of design features will allow iLocater to achieve sub-m/s radial velocity precision in the near-infrared, and to serve as the first optimized diffraction-limited spectrograph for EPRV science
New metrology techniques improve the production of silicon diffractive optics
新计量技术提高了硅衍射光学器件的生产
DOI： --
发表时间： 2014
期刊： Astronomical Telescopes and Instrumentation
影响因子： --
作者：
C. Brooks;M. Gully;M. Grigas;D. Jaffe
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CARMENES: high-resolution spectra and precise radial velocities in the red and infrared
CARMENES：红色和红外的高分辨率光谱和精确的径向速度
DOI： --
发表时间： 2018
期刊： Astronomical Telescopes + Instrumentation
影响因子： --
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Extreme Precision
极高的精度
DOI： 10.1007/978-3-662-53120-4_300233
发表时间： 2019
期刊： CIRP Encyclopedia of Production Engineering
影响因子： --
作者：
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Characterization of Single-mode Fiber Coupling at the Large Binocular Telescope
大型双目望远镜单模光纤耦合的表征
DOI： 10.1088/1538-3873/ab42cb
发表时间： 2020
期刊： Publications of the Astronomical Society of the Pacific
影响因子： 3.5
作者：
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The iLocater cryostat and thermal control system: enabling extremely precise radial velocity measurements for diffraction-limited spectrographs
iLocater 低温恒温器和热控制系统：为衍射极限光谱仪提供极其精确的径向速度测量
DOI： 10.1117/12.2630199
发表时间： 2022
期刊： Volume 12184
影响因子： --
作者：
Crass, Jonathan;Sadagopan, Nandini;Misch, Matthew;Rizika, Alexa;Sands, Brian;Engstrom, Matthew;Crepp, Justin R.;Smous, James;Chilcote, Jeffrey;Fantano, Louis G.
通讯作者： Fantano, Louis G.