Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 40: Ultrashort laser pulses I
Q 40.3: Vortrag
Donnerstag, 20. März 2014, 11:00–11:15, DO26 207
Modelocking of OPSL Pumped Ytterbium-based Lasers — •Alexander Heuer1, Kolja Beil1, Günter Huber1,2, and Christian Kränkel1,2 — 1Institut für Laser-Physik, Universität Hamburg — 2The Hamburg Centre for Ultrafast Imaging
Optically pumped semiconductor lasers (OPSLs) are viable pump sources for Ytterbium-doped gain materials due to their near diffraction-limited beam profile even at high output power. In particular, Yb:Lu2O3 due to its large bandwidth, high laser efficiency, and thermal conductivity is an excellent material for ultrashort pulse generation. We report on a SESAM modelocked Yb:Lu2O3 laser pumped by an OPSL capable of delivering 10 W of output power at 976 nm. Slope efficiencies in excess of 70 % and continuous wave output powers of up to 6 W in single-mode operation were achieved. Without dispersion compensation we obtained positively chirped pulses with a duration of 4 ps at 100 MHz repetition rate and 1 W average output power using a 2 mm Yb(3 %):Lu2O3-crystal as the gain medium. Implementation of dispersion compensation by means of Gires-Tournois Interferometer (GTI) mirrors for compensation of self-phase modulation should allow for pulse durations below 500 fs maintaining the average power. The results will also be presented at the conference.