Chang, Chao High-brightness X-ray free-electron laser with an optical undulator by pulse shaping. [electronic resource] - Optics express Dec 2013 - 32013-8 p. digital Publication Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. ISSN: 1094-4087 Standard No.: 10.1364/OE.21.032013 doi