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A prototype cross-dispersed optical echelle spectrograph of very highresolution has been designed and built at Steward Observatory and tested at theStarfire Optical Range (SOR) 1.5 m telescope. It is the first spectrograph totake advantage of diffraction-limited images provided by adaptive optics inorder to achieve a potential resolving power of $R \sim 600,000$. Thewavelength coverage in a single exposure is about 300 \AA, which isapproximately 100 times that of conventional spectrographs operating atcomparable resolution. This was achieved by recording 60 cross-dispersed ordersacross the $18\times 18$ mm$^2$ area of the CCD detector. The total efficiencyof the system, including the sky and telescope transmission, spectrograph andCCD detector, is measured to be 1.3% at peak, much higher than that of otherultra-high-resolution spectrographs. Sample stellar spectra with $R \sim250,000$ are presented.Comment: 29 pages, 12 figures, 2 tables, accepted for publication in PASP  August issu

An Optical Ultrahigh‐Resolution Cross‐dispersed Echelle Spectrograph with Adaptive Optics