We report on high-power continuous-wave operations of an Er:YAG ceramic laser in-band
pumped by a cladding-pumped Er,Yb fiber laser at 1532 nm. With an output coupler of 10%
transmission, the ceramic laser yielded 16.7 W of continuous-wave output at 1645 nm for 28.8 W of
incident pump power, corresponding to a slope efficiency of 61.0% with respect to the incident pump
power. The lasing wavelength switched to 1617 nm when output couplers of > 20% transmission were
used. Up to 16.2 W of 1617 nm output was generated for 33.0 W of incident pump power, corresponding
to a slope efficiency of 51.8%. Graphene Q-switched operation of Er:YAG cermic laser at 1645 nm was
also demonstrated with stable pulses of 30-74 kHz repetition rates and 1.5-6.4
<i>μ</i>s pulse widths.
© 2013 Optical Society of Korea
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