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We describe an efficient laser emission from a directly grown Er3+:YAGsingle-crystal fiber that is resonantly pumped using a continuous-wave (CW)laser diode at 1532 nm. In a longitudinal pumping, it emits 12.5 W at 1645 nmwith a slope efficiency of 32%, which is the highest ever reported for adirectly grown Er:YAG single-crystal fiber laser. Using an off-axis pumpingscheme, CW output powers up to 7.3 W can be reached and in Q-switchedoperation, the laser produces 2 mJ pulses with a duration of 38 ns at therepetition rate of 1 kHz with an M^{2} factor below 1.8. To our knowledge thisis the first directly grown Er3+:YAG single-crystal fiber Q-switched laser. Indual-side pumping scheme a laser emission at 1617 nm is achieved with outputpowers up to 5.7 W representing the highest output power ever achieved by adiode-pumped Er:YAG laser at this wavelength.

High-power diode-pumped Q-switched Er3+:YAG single-crystal fiber laser for active imaging system