Voici les éléments 1 - 10 sur 41
- PublicationMétadonnées seulementVertical integration of ultrafast semiconductor lasers(2007)
;Maas, Deran J. H. C. ;Bellancourt, Aude-Reine ;Rudin, Benjamin ;Golling, Matthias ;Unold, HJ ;Keller, Ursula
- PublicationAccès libreUltrafast thin-disk laser with 80 µJ pulse energy and 242 W of average powerWe present a semiconductor saturable absorber mirror (SESAM) mode-locked thin-disk laser generating 80 µJ of pulse energy without additional amplification. This laser oscillator operates at a repetition rate of 3.03 MHz and delivers up to 242 W of average output power with a pulse duration of 1.07 ps, resulting in an output peak power of 66 MW. In order to minimize the parasitic nonlinearity of the air inside the laser cavity, the oscillator was operated in a vacuum environment. To start and stabilize soliton mode locking, we used an optimized high-damage threshold, low-loss SESAM. With this new milestone result, we have successfully scaled the pulse energy of ultrafast laser oscillators to a new performance regime and can predict that pulse energies of several hundreds of microjoules will become possible in the near future. Such lasers are interesting for both industrial and scientific applications, for example for precise micromachining and attosecond science.
- PublicationMétadonnées seulementFemtosecond thin disk laser oscillator with pulse energy beyond the 10-microjoule level(2008)
;Marchese, Sergio V ;Baer, Cyrill Roman Emmanuel ;Engqvist, AG ;Hashimoto, S ;Maas, Deran J. H. C. ;Golling, Matthias ;Keller, Ursula
- PublicationMétadonnées seulementSESAMs for high-power oscillators: design guidelines and damage thresholds
- PublicationMétadonnées seulementHigh-power MIXSEL: an integrated ultrafast semiconductor laser with 6.4 W average power
- PublicationAccès libreExperimentally verified pulse formation model for high-power femtosecond VECSELsOptically pumped vertical-external-cavity surface-emitting lasers (OP-VECSELs), passively modelocked with a semiconductor saturable absorber mirror (SESAM), have generated the highest average output power from any sub-picosecond semiconductor laser. Many applications, including frequency comb synthesis and coherent supercontinuum generation, require pulses in the sub-300-fs regime. A quantitative understanding of the pulse formation mechanism is required in order to reach this regime while maintaining stable, high-average-power performance. We present a numerical model with which we have obtained excellent quantitative agreement with two recent experiments in the femtosecond regime, and we have been able to correctly predict both the observed pulse duration and the output power for the first time. Our numerical model not only confirms the soliton-like pulse formation in the femtosecond regime, but also allows us to develop several clear guidelines to scale the performance toward shorter pulses and higher average output power. In particular, we show that a key VECSEL design parameter is a high gain saturation fluence. By optimizing this parameter, 200-fs pulses with an average output power of more than 1 W should be possible.
- PublicationMétadonnées seulementFemtosecond VECSEL with tunable multi-gigahertz repetition rate
- PublicationMétadonnées seulementYb-doped mixed sesquioxides for ultrashort pulse generation in the thin disk laser setup(2013)
;Beil, Kolja ;Saraceno, Clara Jody ;Schriber, Cinia ;Emaury, Florian ;Heckl, Oliver Hubert ;Baer, Cyrill Roman Emmanuel ;Golling, Matthias ; ;Keller, UrsulaKränkel, Christian
- PublicationAccès libreYb-doped mixed sesquioxides for ultrashort pulse generation in the thin disk laser setup
;Beil, Kolja ;Saraceno, Clara J ;Schriber, Cinia ;Emaury, Florian ;Heckl, Oliver H ;Baer, Cyrill R. E ;Golling, Matthias ; ;Keller, Ursula ;Kränkel, ChristianHuber, GünterWe report on spectroscopic investigations of the mixed sesquioxide laser materials Yb:LuScO3, Yb:YScO3, and Yb:(Lu,Y,Sc)2O3 as well as mode-locked thin disk laser experiments with Yb:LuScO3 and Yb:(Lu,Y,Sc)2O3. The disordered crystal structures of these materials result in significantly broader emission spectra than for the pure sesquioxides Yb:Sc2O3, Yb:Y2O3, and Yb:Lu2O3 providing a high potential for ultrashort pulse generation. In SESAM mode-locked thin disk laser experiments, pulse durations of around 100 fs could be obtained exploiting >70 % of the gain bandwidth which is to the best of our knowledge the optimum obtained so far for the mode-locked lasers in this setup.