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Modsching, Norbert

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Modsching, Norbert
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https://libra.unine.ch/handle/123456789/1065

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  • Publication
    Accès libre
    XUV Sources Based on Intra-Oscillator High Harmonic Generation with Thin-Disk Lasers: Current Status and Prospects
    Labaye, François
    ;
    Gaponenko, Maxim 
    ;
    Modsching, Norbert 
    ;
    Brochard, Pierre 
    ;
    Paradis, Clément 
    ;
    Schilt, Stephane 
    ;
    Wittwer, Valentin Johannes
    ;
    Südmeyer, Thomas 
    Ultrafast thin-disk laser (TDL) oscillators provide higher intracavity pulse energy, average power, and peak power levels than any other femtosecond laser oscillator technology. They are suitable for driving extreme nonlinear interactions directly inside the laser oscillator. High harmonic generation (HHG) driven inside ultrafast TDL oscillators is a very recent approach for the generation of coherent extreme ultraviolet (XUV) light at multi-megahertz repetition rates. In this paper, we review the current state of the development, discuss the technological potential, and give an outlook toward the future developments. We compare the current performance to established technologies and evalu-ate possible limitations. We discuss future improvements, such as reduction of the driving pulse duration and increase of the intracavity peak power, efficient extraction of the XUV light from the cavity, and carrier-envelope offset frequency stabilization of the generated XUV light. Due to the power scalability of the TDL concept and the possibility to operate in a spectrally broadened regime with pulse durations below the gain bandwidth limitation, intra-oscillator HHG with TDLs has a high potential for powerful table-top multi-megahertz coherent XUV light sources for science and applications.
  • Publication
    Accès libre
    Kerr lens mode-locked Yb:CALGO thin-disk laser
    Modsching, Norbert 
    ;
    Paradis, Clément 
    ;
    Labaye, François
    ;
    Gaponenko, Maxim 
    ;
    Graumann, Ivan J
    ;
    Diebold, Andreas
    ;
    Emaury, Florian
    ;
    Wittwer, Valentin 
    ;
    Südmeyer, Thomas 
    We demonstrate the first Kerr lens mode-locked Yb:CaGdAlO4 (Yb:CALGO) thin-disk laser oscillator. It generates pulses with a duration of 30 fs at a central wavelength of 1048 nm and a repetition rate of 124 MHz. The laser emits the shortest pulses generated by a thin-disk laser oscillator, equal to the shortest pulse duration obtained by Yb-doped bulk oscillators. The average output power is currently limited to 150 mW by the low gain and limited disk quality. We expect that more suitable Yb:CALGO disks will enable substantially higher power levels with similar pulse durations.
  • Publication
    Accès libre
    Sub-100-fs Kerr lens mode-locked Yb:Lu2O3 thin-disk laser oscillator operating at 21 W average power
    Modsching, Norbert 
    ;
    Drs, Jakub 
    ;
    Fischer, Julien
    ;
    Paradis, Clément 
    ;
    Labaye, François
    ;
    Gaponenko, Maxim 
    ;
    Kränkel, Christian
    ;
    Wittwer, Valentin 
    ;
    Südmeyer, Thomas 
    We investigate power-scaling of a Kerr lens mode-locked (KLM) Yb:Lu2O3 thin-disk laser (TDL) oscillator operating in the sub-100-fs pulse duration regime. Employing a scheme with higher round-trip gain by increasing the number of passes through the thin-disk gain element, we increase the average power by a factor of two and the optical-to-optical efficiency by a factor of almost three compared to our previous sub-100-fs mode-locking results. The oscillator generates pulses with a duration of 95 fs at 21.1 W average power and 47.9 MHz repetition rate. We discuss the cavity design for continuous-wave and mode-locked operation and the estimation of the focal length of the Kerr lens. Unlike to usual KLM TDL oscillators, an operation at the edge of the stability zone in continuous-wave operation is not required. This work shows that KLM TDL oscillators based on the gain material Yb:Lu2O3 are an excellent choice for power-scaling of laser oscillators in the sub-100-fs regime, and we expect that such lasers will soon operate at power levels in excess of hundred watts.