Südmeyer, Thomas

2014, Saraceno, Clara Jody, Emaury, Florian, Schriber, Cinia, Hoffmann, Martin, Golling, Matthias, Südmeyer, Thomas, Keller, Ursula

2013, Emaury, Florian, Dutin, Coralie Fourcade, Saraceno, Clara Jody, Trant, Mathis, Heckl, Oliver Hubert, Wang, Yang Y, Schriber, Cinia, Gerome, Frederic, Südmeyer, Thomas, Benabid, Fetah

, Saraceno, Clara J, Schriber, Cinia, Emaury, Florian, Heckl, Oliver H, Baer, Cyrill R. E, Hoffmann, Martin, Beil, Kolja, Kränkel, Christian, Golling, Matthias, Südmeyer, Thomas, Keller, Ursula

A growing number of applications in science and industry are currently pushing the development of ultrafast laser technologies that enable high average powers. SESAM modelocked thin disk lasers (TDLs) currently achieve higher pulse energies and average powers than any other ultrafast oscillator technology, making them excellent candidates in this goal. Recently, 275 W of average power with a pulse duration of 583 fs were demonstrated, which represents the highest average power so far demonstrated from an ultrafast oscillator. In terms of pulse energy, TDLs reach more than 40 µJ pulses directly from the oscillator. In addition, another major milestone was recently achieved, with the demonstration of a TDL with nearly bandwidth-limited 96-fs long pulses. The progress achieved in terms of pulse duration of such sources enabled the first measurement of the carrier-envelope offset frequency of a modelocked TDL, which is the first key step towards full stabilization of such a source. We will present the key elements that enabled these latest results, as well as an outlook towards the next scaling steps in average power, pulse energy and pulse duration of such sources. These cutting-edge sources will enable exciting new applications, and open the door to further extending the current performance milestones.

, Diebold, Andreas, Emaury, Florian, Schriber, Cinia, Golling, Matthias, Saraceno, Clara J, Südmeyer, Thomas, Keller, Ursula

We present a semiconductor saturable absorber mirror (SESAM) mode-locked thin disk laser (TDL) based on Yb:CaGdAlO₄ (Yb:CALGO) generating 62 fs pulses, which is the shortest pulse duration achieved from mode-locked TDLs to date. The oscillator operates at a repetition rate of 65 MHz and delivers 5.1 W of average output power. The short pulse duration of our TDL in combination with the high intracavity peak power of 44 MW makes this oscillator attractive for intracavity table-top extreme nonlinear optics applications such as high harmonic generation and vacuum ultraviolet frequency comb generation. The current average power was limited by the quality of the Yb:CALGO disk. However, power scaling of Yb:CALGO TDLs to the multi-10-W range with short pulse durations (<100  fs) appears feasible in the near future by using thinner disks of better quality and further optimized SESAMs.

2013, Diebold, Andreas, Emaury, Florian, Schriber, Cinia, Golling, Matthias, Saraceno, Clara Jody, Südmeyer, Thomas, Keller, Ursula

2013, Saraceno, Clara Jody, Schriber, Cinia, Emaury, Florian, Heckl, Oliver Hubert, Baer, Cyrill Roman Emmanuel, Hoffmann, Martin, Beil, Kolja, Kränkel, Christian, Golling, Matthias, Südmeyer, Thomas

, Saraceno, Clara J, Emaury, Florian, Heckl, Oliver. H, Baer, Cyrill. R. E, Hoffmann, Martin, Schriber, Cinia, Golling, Matthias, Südmeyer, Thomas, Keller, Ursula

We present an ultrafast thin disk laser that generates an average output power of 275 W, which is higher than any other modelocked laser oscillator. It is based on the gain material Yb:YAG and operates at a pulse duration of 583 fs and a repetition rate of 16.3 MHz resulting in a pulse energy of 16.9 µJ and a peak power of 25.6 MW. A SESAM designed for high damage threshold initiated and stabilized soliton modelocking. We reduced the nonlinearity of the atmosphere inside the cavity by several orders of magnitude by operating the oscillator in a vacuum environment. Thus soliton modelocking was achieved at moderate amounts of self-phase modulation and negative group delay dispersion. Our approach opens a new avenue for power scaling femtosecond oscillators to the kW level.

2013, Beil, Kolja, Saraceno, Clara Jody, Schriber, Cinia, Emaury, Florian, Heckl, Oliver Hubert, Baer, Cyrill Roman Emmanuel, Golling, Matthias, Südmeyer, Thomas, Keller, Ursula, Kränkel, Christian

2013, Klenner, Alexander, Emaury, Florian, Schriber, Cinia, Diebold, Andreas, Saraceno, Clara Jody, Schilt, Stephane, Keller, Ursula, Südmeyer, Thomas

, Beil, Kolja, Saraceno, Clara J, Schriber, Cinia, Emaury, Florian, Heckl, Oliver H, Baer, Cyrill R. E, Golling, Matthias, Südmeyer, Thomas, Keller, Ursula, Kränkel, Christian, Huber, Günter

We 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.