Concentration effect of dispersed-graphene based saturable absorber on stabilizing and shortening mode-locked pulse. - Shr-Hau Huang; Pi Ling Huang; Bi-Zen Hsieh; Hsin-Hui Kuo; Chao-Yung Yeh; Shau-Ching Lin; Jiang-Jen Lin; Wood-Hi Cheng (WOCC, 2012)