Abstract

We report on efficient high-power passively $Q$-switched operation of a $\mathrm{Yb}\text{:}{\mathrm{YCa}}_4\mathrm{O}{({\mathrm{BO}}_3)}_3$ laser with a GaAs crystal plate acting as the saturable absorber. An average output power of 5.7 W at 1032 nm is generated at a pulse repetition rate of 166.7 kHz when the incident pump power is 26.8 W, with a slope efficiency determined to be 24.5%. The averaged pulse energy achieved is roughly 30 μJ and is increased to about 40 μJ when the output coupling used changes from 30% to 50%, while the shortest pulse width is measured to be 153 ns.

© 2015 Optical Society of America

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