High-power 100-fs pulse generation by frequency doubling of an erbium-ytterbium-fiber master oscillator power amplifier

Frequency doubling of an erbium-ytterbium-fiber master-oscillator-power-amp lifier system is demonstrated. Simultaneous amplification and pulse compres sion in multimode erbium-ytterbium-doped fibers produces high-quality near- diffraction and near-bandwidth-limited 100-fs pulses at a wavelength of 1.6 2 mu m with an average power of 230 mW at a repetition rate of 52 MHz. Peri odically poled LiNbO3 allows for frequency doubling with a conversion effic iency of 51%, producing near-bandwidth-limited 105-fs pulses with an averag e power of 117 mW and a pulse energy of 2.3 nJ at a wavelength of 810 nm. ( C) 1998 Optical Society of America.