Sub-70fs Generation from Passively Mode Locked Erbium Doped Fiber Laser Using 45° Tilted Fiber Grating

We have demonstrated an all-fiber Erbium doped ultrafast laser by inserting a 45° tilted fiber grating. After optimizing the balance between intra-cavity nonlinearity and dispersion, an ultrashort pulse with sub-70 fs pulse duration can be achieved.