中国科学院南京天文光学技术研究所机构知识库

We present a novel near-infrared(NIR)spectrograph for the Large Sky Area Multi-Object Fiber Spectroscopic Telescope(LAMOST),enhancing its capabilities beyond the optical band(370–900nm).Designed for high-precision observations of bright NIR targets(e.g.,late-type stars,red supergiants),the instrument integrates a VPH grating, refractive camera,and cryogenic Dewar on a rotary stage,enabling three observing modes via coordinated rotations. Each mode acquires simultaneous NIR spectra for 100 targets.Laboratory verification confirms:complete 900~1400nm wavelength coverage with spectral resolution R=900–1600(via NeAr/HgCd lamps);throughputs of 51.5%(980nm)and 55.5%(1064nm),consistent with coating simulations;and exceptional stability(0.05Å/hour drift over 4 hours).These results demonstrate full compliance with LAMOST’s NIR survey requirements.The system opens new avenues for large-scale NIR studies,complementing optical data to deliver complete spectral distributions for millions of objects.
Future work focuses on observational mode optimization.