A high-power Er:YAG laser that is in-band pumped by a high-power cladding-pumped erbium–ytterbium codoped fiber laser operating at $1532\mathrm{nm}$ is reported. The Er:YAG laser produced $60.3\mathrm{W}$ of continuous-wave output at $1645.3\mathrm{nm}$ in a beam with $M^2\approx 3$ for $82\mathrm{W}$ of incident pump power and $20\mathrm{W}$ of ${\mathrm{TEM}}_{00}$ output with $M^2<1.2$ for $32.4\mathrm{W}$ of incident pump power. The slope efficiency with respect to incident pump power at pump powers of $>20\mathrm{W}$ was $\sim 81\%$ . In the Q-switched mode of operation, a slightly modified resonator configuration incorporating an electro-optic Q switch produced pulses of $\sim 4\mathrm{mJ}$ energy and $\sim 100\mathrm{ns}$ (FWHM) duration, corresponding to a peak power of $\sim 42\mathrm{kW}$ at a repetition rate of $1\mathrm{kHz}$ for an incident pump power of $16.8\mathrm{W}$ . The prospects for further improvement in continuous-wave and Q-switched performance are discussed.

© 2006 Optical Society of America

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