Abstract

We report on high-energy femtosecond pulse generation from an ytterbium-doped rod-type fiber oscillator emitting around 976nm. Self-starting and stable single-pulse operation are demonstrated with 4.2W of average output power at a repetition rate of 8.4MHz. The resulting energy level reaches 0.5μJ. Because of the all-normal dispersion of the laser cavity, output pulses are naturally chirped with a duration of 14ps. External compression using diffraction gratings shortens the pulse duration down to 460fs.

© 2011 Optical Society of America

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