Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 30: Laser Development: Solid State and Semiconductor Lasers
Q 30.4: Talk
Tuesday, March 24, 2015, 15:15–15:30, K/HS2
Efficient Yb:CaGdAlO4 bulk and waveguide lasers — •Kore Hasse1, Bastian Deppe1,2,3, Thomas Calmano1,2, and Christian Kränkel1,2 — 1Institut für Laser-Physik, Universität Hamburg — 2The Hamburg Centre for Ultrafast Imaging, Universität Hamburg — 3Center for Free-Electron Laser Science, DESY, Hamburg
Femtosecond-laser-writing of waveguides in crystalline materials allows for compact efficient waveguide lasers in continuous wave
operation. Furthermore these kinds of lasers could be suitable to generate high repetition rates and ultra-short pulses in modelocked
operation.
The crystalline laser material Yb:CaGdAlO4 is known for its broad emission spectrum. Therefore it is an established
material for the generation of ultra-short pulses in modelocking experiments.
Here we report on our research towards a modelocked Yb:CaGdAlO4 waveguide laser. We performed crystal growth, spectroscopy
and laser experiments in bulk and waveguide geometry. In the bulk laser experiments slope efficiencies of up to 75% were obtained.
Furthermore we fabricated waveguides by fs-laser-inscription in this material. By pumping with an optically pumped semiconductor
laser at 980 nm we demonstrated, to the best of our knowledge, the first fs-laser written waveguide-laser in Yb:CaGdAlO4 .
We achieved a slope efficiency of 32% with a maximum output power of 1.3 W at a laser wavelength of 1055 nm. Further
investigations regarding improved fs-laser-writing and laser parameters will be presented at the conference.