Frequency doubling of an erbium–ytterbium-fiber master-oscillator–power-amplifier system is demonstrated. Simultaneous amplification and pulse compression in multimode erbium–ytterbium-doped fibers produces high-quality near-diffraction and near-bandwidth-limited 100-fs pulses at a wavelength of 1.62µm with an average power of 230 mW at a repetition rate of 52 MHz. Periodically poled LiNbO<sub>3</sub> allows for frequency doubling with a conversion efficiency of 51%, producing near-bandwidth-limited 105-fs pulses with an average power of 117 mW and a pulse energy of 2.3 nJ at a wavelength of 810 nm.
© 1998 Optical Society of America
(060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
(060.2410) Fiber optics and optical communications : Fibers, erbium
(060.7140) Fiber optics and optical communications : Ultrafast processes in fibers
(190.2620) Nonlinear optics : Harmonic generation and mixing
(320.7090) Ultrafast optics : Ultrafast lasers
M. Hofer, M.E. Fermann, A. Galvanauskas, D. Harter, and Robert S. Windeler, "High-power 100-fs pulse generation by frequency doubling of an erbium ytterbium-fiber master oscillator power amplifier," Opt. Lett. 23, 1840-1842 (1998)