Cladding pumped ultrafast fiber oscillators and amplifiers

length of the modelocked light pulses was switched between h, and h,. The spectra corresponding to the modelocked pulse trains of X, and h, is given in Fig. 3. It was found that the buildup of stable mode emission tookabout 15 roundtrips. Therefore, the switching speed between two wavelengths was on the order of about 1 MHz. This speed can be increased by reducing the lengths and losses of the cavities. With this scheme the switching between several wavelengths may also be obtained when more than two gratings are used. In summary, we have experimentally demonstrated electrical wavelength switching of modelocked light pulses in a Er-doped fiber laser using two fiber gratings. The switching speed was on the order of about 1 MHz. +Shanghai Institute of Optics eh Fine Mechanics, CAS, China