A　picosecond　tunable　ytterbium-doped　double-clad　fiber　oscillator　with　semiconductor　saturable　absorber　mirror　(SESAM)　mode-locking　large　mode　area　(LMA)　photonic　crystal　fiber　(PCF)　is　demonstrated.　Without　any　tunable　elements　in　the　oscillator,　we　obtain　self-starting　mode　locking　ytterbium-doped　fiber　oscillator　tunable　over　35.5　nm.　The　center　wavelength　in　the　ranges　from　1028.5　nm　to　1064　nm　with　excellent　beam　quality　is　achieved　by　proper　adjusting　the　polarization　beam　splitter　(PBS),　half-wave　plate　(HWF)　and　SESAM　in　the　laser　cavity.　The　output　power　ranges　from　0.76W　to　1.01　W　at　the　different　center　wavelengths　under　the　same　incident　pump　power.　A　narrow　spectral　bandwidth　with　only　025-0.5　nm　and　pulsed　duration　with　7.9　ps　have　been　obtained　at　the　different　center　wavelengths.　The　repetition　rate　has　been　measured　to　be　about　45.9　MHz,　which　has　a　slight　change　for　the　different　center　wavelengths.　Crown　Copyright　(C)　2013　Published　by　Elsevier　B.V.　All　rights　reserved.