An Optical Ultrahigh Resolution Spectrograph for Use with Adaptive   Optics
  A prototype ultrahigh resolution spectrograph has been built with an adaptive optics telescope. It provides $250,000$ resolving power, 300 \AA\ wavelength coverage and 0.8\% efficiency. 
J. Ge, B. Jacobsen, J.R.P. Angel, N. Woolf, J. H. Black, M.   Lloyd-Hart, P. Gray, R. Q. Fugate