Laser operation with nearly diffraction-limited output from a Yb:YAG multimode channel waveguide.
We report laser action of a crystal channel-waveguide laser consisting of a diffusion-bonded Yb:YAG-YAG core-cladding structure. By use of diode bars a side-pumped arrangement adapted to the channel-waveguide geometry was realized, resulting in up to 1-W output power and a low threshold. With a rectangular core with a 100-mum cross section, nearly diffraction-limited performance is demonstrated. The influence of the guiding properties of the channel waveguide on the resonator mode was studied with a nearly concentric resonator.
Griebner
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Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Rudower Chaussee 6, D-12489 Berlin, Germany.
Schönnagel
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