Q-Switched Ytterbium doped fiber laser with graphene oxide embedded in polyethylene oxide film based saturable absorber by Haris, Hazlihan, Anyi, C. L., Muhammad, Ahmad Razif, Md. Nor, Roslan Md., Zulkepely, Nurul Rozullyah, Ahmad, Fauzan, Md. Ali, Norfizah, Harun, Sulaiman Wadi, Arof, Hamzah