Widely tunable femtosecond fiber laser

摘要

The possibility to build up an optical source of femtosecond pulses that are smoothly tuned in the telecommunication range using a dispersion-decreasing fiber is demonstrated. The smooth tuning is based on the Raman frequency conversion of ultrashort pulses, which can be effectively tuned due to the compression mechanism for maintaining of a relatively high pulse intensity in the medium with a monotonically decreasing anomalous dispersion. The generation of a 90-fs soliton pulse whose wavelength is smoothly tuned in the wavelength range 1.55 - 1.85μm is experimentally demonstrated.