Nonlinear microscopy techniques developed over the past two decades have provided
dramatic new capabilities for biological imaging. The initial demonstrations of nonlinear …

The generation and stable propagation of ultrashort optical pulses tend to be limited by
accumulation of excessive nonlinear phase shifts. The limitations are particularly …

Ultrafast fiber lasers have gained rapid advances in last decades for their intrinsic merits
such as potential of all-fiber format, excellent beam quality, superior power scalability, and …

We propose a method for controlling modal gain in a multimode Erbium-doped fiber
amplifier (MM-EDFA) by tuning the mode content of a multimode pump. By adjusting the …

We report on an ytterbium-doped photonic crystal fiber with a core diameter of 60 µm and
mode-field-area of~ 2000 µm^ 2 of the emitted fundamental mode. Together with the short …

We report on an air-clad large-core single-transverse-mode ytterbium-doped photonic
crystal fiber with a mode-field-diameter of 35 µm, corresponding to a mode-field-area of …

We report on the generation of linearly chirped parabolic pulses with 17-W average power at
75 MHz repetition rate and diffraction-limited beam quality in a large-mode-area ytterbium …

The recent demonstration of rare-earth-doped fiber lasers with a continuous wave output
power well above the kilowatt level with diffraction-limited beam quality has proven that fiber …

We demonstrate robust single-transverse-mode light propagation in higher-order modes of a
fiber, with effective area A_eff ranging from 2100 to 3200 μm^ 2. These modes are accessed …

A model based on propagation-rate equations with consideration of transverse gain
distribution is built up to describe the transverse mode competition in strongly pumped …