Abstract
We demonstrate a simple and compact Holmium-doped fiber femtosecond oscillator, in-band pumped by a commercial Tm-doped fiber laser. The oscillator operates in the dispersion managed soliton regime at net zero intracavity dispersion and delivers >1 nJ pulse energy at 35MHz repetition rate. The pulse duration directly at the oscillator output is 160fs FWHM, close to the Fourier-limit of 145fs FWHM. Using an additional nonlinear compressor stage, sub-100fs FWHM pulse durations could be achieved. The nonlinear fiber compressor is implemented by a solid core highly nonlinear fiber for spectral broadening and a single mode fiber for pulse compression.
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