Design of an efficient infrared spectrometer for large telescopes

摘要

Abstract: We present the conceptual design for a medium-resolution (R $EQ 2000, 6000) spectrometer for the near IR (0.9 $mu@m - 5 $mu@m) to be used on the Gemini 8 m Telescopes. The design goal is to make optimum use of the unique characteristics of the telescopes: superb image quality and low near-IR background. This leads us to propose a mostly reflective design, with cold, pupil-reimaging fore-optics. We achieve a modest slit length of 100 arcsec. In addition to the basic high-spatial-resolution configuration, the design permits a number of important upgrades: a camera for use with a wider slit, a prism cross-disperser, an integral field module to spatially sample a small 2-D region of the focal plane. The spectrometer is designed around the next generation of InSb detectors, the 1024 $MUL 1024 Aladdin arrays currently under development. !1