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Optica Publishing Group
  • CLEO/Europe and EQEC 2011 Conference Digest
  • OSA Technical Digest (CD) (Optica Publishing Group, 2011),
  • paper CJ5_4

5 µJ femtosecond pulses from a giant-chirp ytterbium fiber oscillator

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Abstract

Pulse energy scaling of mode-locked femtosecond fiber oscillators is important for applications in material processing and nonlinear optics. To date the highest output pulse energies have been obtained from all-normal dispersion fiber oscillators operating in the dissipative soliton regime [1,2]. The energies of these dissipative solitons are limited by the total nonlinear phase-shift accumulated over one resonator round-trip. To increase the pulse energy the peak intensities inside the fiber section of the oscillator must be reduced. This can be achieved either by increase of the mode-field diameter of the fibers or the pulse duration. The mode-field diameter can be increased up to approximately 25 µm in standard large-mode-area (LMA) fibers. Long pulse durations can be obtained in the giant-chirp regime of all-normal dispersion fiber oscillators with large total resonator dispersion [3]. We combined both power-scaling methods to obtain 0.5 µJ pulses from a ytterbium step-index fiber oscillator.

© 2011 Optical Society of America

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