In　the　same　experimental　condition,　three　5-at%　Yb3+-doped　crystals　were　tuned　using　one　fused　quartz.　The　range　of　their　tunable　wavelengths　are　70　nm,　66　nm　and　74　nm,　respectively.　The　output　power　of　the　Yb:LSO　is　higher　than　the　others　with　a　6%　transmission　output　coupler　and　the　optical-optical　efficiency　arrives　at　38.3%.　Yb:GSO　is　easier　to　obtain　high　output　power　at　a　longer　wavelength,　while　Yb:GYSO　is　more　suitable　for　mode-locking　for　its　flatter　tunable　curve.