Er:Y2O3 high-repetition rate picosecond 2.7 $\mu$ m laser

In this paper, we present results obtained with a compact passively Q-switched mode-locked high-repetition rate Er:Y2O3 generating radiation in mid-infrared region. The Er:Y2O3 active medium was tested in a short V-shape laser resonator and the mode-locked pulses with repetition rate 1.38 GHz were obtained. With the Er:Y2O3 ceramic the shortest 86 4 ps mode-locked pulses with pulse energy 3.55 nJ, corresponding peak power 12 W, and laser wavelength 2.74 m were generated.