Excited-state absorption in laser Cr4 + :Y2SiO5 crystals Kuleshov, N. V. ; Scherbitsky, V. G. ; Mikhailov, V. P. ; Kornienko, A. A. ; Dunina, E. B. ; Hartung, S. ; Danger, T. ; Huber, G. Abstract Publication: Optics and Spectroscopy Pub Date: July 1999 Bibcode: 1999OptSp..87...70K