Mode locking based on an epitaxial composite of the monoclinic double tungstate crystal Yb:KLu(WO4)2 is realized. A 100 µm thin Yb:KLu(WO4)2 layer grown on a KLu(WO4)2 substrate is used as an active medium in a laser passively mode locked by a semiconductor saturable absorber. Pulse durations of 114 fs have been achieved for an average power of 31 mW at 1030 nm. Results in the femtosecond and picosecond regimes of the Yb:KLu(WO4)2/KLu(WO4)2 laser are presented. The great potential of Yb-doped tungstate composite structures as active elements for mode-locked laser systems is demonstrated.
© 2005 Optical Society of America
(140.4050) Lasers and laser optics : Mode-locked lasers
(140.5680) Lasers and laser optics : Rare earth and transition metal solid-state lasers
(160.5690) Materials : Rare-earth-doped materials
Simon Rivier, Xavier Mateos, Valentin Petrov, Uwe Griebner, Ana Aznar, Oscar Silvestre, Rosa Sole, Magdalena Aguilo, Francesc Diaz, Martin Zorn, and Markus Weyers, "Mode-locked laser operation of epitaxially grown Yb:KLu(WO4)2 composites," Opt. Lett. 30, 2484-2486 (2005)