An all-fiber high-power Mamyshev oscillator (MO) with only one amplification stage was experimentally demonstrated. The achieved maximum output power was 3.4 W with 77 nJ pulse energy and could be compressed to ~100 fs. By adjusting the pump power, the phenomenon of harmonic mode locking is observed in the experiment, and the highest 5th order harmonic can be achieved, which corresponds to the repetition rate of 44.1 MHz. This compact MO ultrafast laser could operate stably several hours and the power fluctuation within 5 h was less than 0.12%. Such a high power ultrafast laser oscillator could apply a promising source for advanced fabrication, biomedical imaging, micromachining and other practical applications.
An all fiber-based Mamyshev oscillators (MO) is experimentally demonstrated to achieve high energy pulse output. In this high energy MO system, the maximum single pulse energy of 153 nJ was achieved with 1.5 W average power. The pulse width could be externally compressed to < 100 fs by a pair of diffraction gratings. Considering the insertion loss of gratings, the maximum peak power was >1 MW. Meanwhile, this system is verified to have good long-term stability and can run several hours stably. This is the highest record in pulse energy from the all fiber-based ultrafast laser oscillator with picosecond/femtosecond pulse duration, to the best of our knowledge. Such a high energy oscillator could apply a promising source for laser micromachining, advanced fabrication, biomedical imaging, and other practical applications.
A gain-managed nonlinear (GMN) tapered fiber amplifier was experimentally demonstrated. The achieved single pulse energy was 707 nJ and the compressed pulse duration was 67 fs with 10 MW peak power at 1054 nm central wavelength.
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