Schedule 0 4:15 PM - 4:30 PM [XOPT6-03] Shortening pulse duration of X-ray free-elecron laser via saturable absorption *Ichiro Inoue1, Yuichi Inubushi2,1, Taito Osaka1, Jumpei Yamada1, Kenji Tamasaku1, Makina Yabashi1,2 (1. RIKEN SPring-8 Center, 2. Japan Synchrotron Radiation Research Institute)