Compact gain-saturated x-ray lasers down to 685 nm and amplification down to 585 nm Rockwood, Alex ; Wang, Yong ; Wang, Shoujun ; Berrill, Mark ; Shlyaptsev, Vyacheslav N. ; Rocca, Jorge J. Abstract Publication: Optica Pub Date: March 2018 DOI: 10.1364/OPTICA.5.000257 Bibcode: 2018Optic...5..257R