Mode-locked $0.5\mathrm{\mu J}$ fiber laser at 976 nm

Abstract

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

© 2011 Optical Society of America

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