Experimental study of a high-gain harmonic-generation free-electron laser in the ultraviolet oleh Adnan Doyuran, Louis DiMauro, William Graves, Richard Heese, Erik D. Johnson, Sam Krinsky, Henrik Loos, James B. Murphy, George Rakowsky, James Rose, Timur Shaftan, Brian Sheehy, Yuzhen Shen, John Skaritka, Xijie Wang, Zilu Wu, Li Hua Yu