标题： 红外成像光谱仪（IRIS）用于TMT：ADC光学设计 显示英文标题

标题： The Infrared Imaging Spectrograph (IRIS) for TMT: the ADC optical design

摘要： 我们介绍了IRIS大气色散校正器（ADC）当前的光学设计。 ADC的设计是为了在25度的海拔高度下，给定波段内的剩余色散小于约1毫角秒。 自上次报告以来，IRIS成像仪的面积增加了四倍，光圈尺寸从75毫米增加到90毫米，这两方面都给设计带来了挑战。 几个因素导致了当前的设计：剩余色散、引入的畸变数量、玻璃透射率、玻璃的可用性以及光瞳位移。 特别是发现存在显著的畸变（两种不同的组件），可能导致长时间曝光时图像模糊。 此外，光瞳位移会增加成像仪焦点处的波前误差。 我们讨论了这些因素，讨论了权衡，并提出了最终的设计选择和预期性能。 显示英文摘要

摘要： We present the current optical design for the IRIS Atmospheric Dispersion Corrector (ADC). The ADC is designed for residual dispersions less than ~1 mas across a given passband at elevations of 25 degrees. Since the last report, the area of the IRIS Imager has increased by a factor of four, and the pupil size has increased from 75 to 90mm, both of which contribute to challenges with the design. Several considerations have led to the current design: residual dispersion, amount of introduced distortion, glass transmission, glass availability, and pupil displacement. In particular it was found that there are significant distortions that appear (two different components) that can lead to image blur over long exposures. Also, pupil displacement increases the wavefront error at the imager focus. We discuss these considerations, discuss the compromises, and present the final design choice and expected performance.