Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 30: Laser Development: Solid State and Semiconductor Lasers
Q 30.2: Talk
Tuesday, March 24, 2015, 14:45–15:00, K/HS2
High finesse thin-disk laser for adiabatic alignment of molecules — •Bastian Deppe1,2,3,4, Günter Huber1,2,3, Jochen Küpper2,3,4, and Christian Kränkel1,3 — 1Institut für Laser-Physik, Universität Hamburg — 2Department of Physics, University of Hamburg — 3Centre for Ultrafast Imaging, University of Hamburg — 4Center for Free-Electron Laser Science, DESY, Hamburg
We are setting up a diode pumped cw thin-disk laser with a high intracavity power. This setup will provide the necessary field strengths for x-ray diffraction experiments of adiabatically aligned molecules at arbitrary repetition rates. The alignment requires an intracavity cw power of more than 150 kW in a focus of ω0=25 µm. For low pump power and low output-coupling transmission, any additional resonator losses are detrimental for achieving a high intracavity power. Thus, we have to rely on gain materials with low intrinsic losses. For this purpose the laser performance of several Yb:YAG and Yb:Lu2O3 disks was analyzed at different output-coupling transmission rates below 0.5%. The calculated resonator roundtrip losses are lower than 0.03% with both gain materials. With Yb:YAG we obtained an intracavity power of 135 kW for a diode pump power of 54 W in a 6 cm short linear resonator. We will report about further power scaling experiments with an equivalent in-vacuum setup. In laser experiments under vacuum conditions we decrease the temperatures of the laser-disk below -50∘C. In these experiments an increased output power stability and lower losses were demonstrated.