Femtosecond fiber laser system for medical applications

We demonstrate a femtosecond fiber laser system delivering >5-μJ, sub-400-fs pulses at a pulse repetition rate of 200 kHz. At constant average power the pulse repetition rate of this Watt-level femtosecond laser can be adjusted up to several MHz. The laser is monolithically integrated from the oscillator to the booster amplifier stage. The system was applied for structuring metallic as well as transparent media as e.g. biological tissues in ophthalmology.