Abstract

In this Letter, we present high-power continuous wave (CW) and $Q$-switched femtosecond laser-written Yb:YAG channel waveguide lasers. In $Q$-switched operation, obtained by a semiconductor saturable absorber mirror (SESAM), as well as in CW operation, the laser generates average output powers of more than 5.6 W and reaches slope efficiencies above 74%. The $Q$-switched laser operated at a maximum repetition rate of 5.4 MHz with a minimum pulse duration of 11 ns, and with a maximum pulse energy of 1 μJ. This laser has almost an order of magnitude higher average output power than previously reported $Q$-switched channel waveguide lasers.

© 2016 Optical Society of America

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