We present a diode-pumped, double-clad Yb:YAG waveguide laser that contains an integrated section of a Cr<sup>4+</sup>: YAG saturable absorber for passive <i>Q</i> switching. Using two 4-W polarization-coupled, broad-striped diode-pumped lasers, we obtained 30-µJ pulses of 1.6-ns duration at repetition rates of as much as 77 kHz. The slope efficiency was ~50% with respect to absorbed pump power, with a maximum output average power of 2.3 W and a peak power of ~18 kW . The output beam was single lobed, with <i>M</i><sup>2</sup> values as great as 1.5×1.3 . We also demonstrate a passively <i>Q</i> -switched Nd:YAG waveguide laser of similar design, operating at 1.064 µm and 946 nm.
© 2002 Optical Society of America
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(140.3540) Lasers and laser optics : Lasers, Q-switched
(230.7390) Optical devices : Waveguides, planar
J. I. Mackenzie and D. P. Shepherd, "End-pumped, passively Q-switched Yb:YAG double-clad waveguide laser," Opt. Lett. 27, 2161-2163 (2002)