Power scaling and high-power applications of afemtosecond enhancement cavity

Power scaling and high-power applications of afemtosecond enhancement cavity

Author(s): Ioachim Pupeza, Max-Planck-Institut für Quantenoptik (Germany) andLudwig-Maximilians-Univ. München (Germany); Tino Eidam,Friedrich-Schiller-Univ. Jena (Germany); Jan Kaster, Jens Rauschenberger,Max-Planck-Institut für Quantenoptik (Germany) and Ludwig-Maximilians-Univ.München (Germany); Birgitta Bernhardt, Akira Ozawa, Ernst E. Fill,Max-Planck-Institut für Quantenoptik (Germany); Vladimir Pervak,Ludwig-Maximilians-Univ. München (Germany); Alexander A. Apolonski,Max-Planck-Institut für Quantenoptik (Germany) and Ludwig-Maximilians-Univ.München (Germany); Thomas Udem, Max-Planck-Institut für Quantenoptik (Germany);Jens Limpert, Friedrich-Schiller-Univ. Jena (Germany); Zeyad A. Alahmed,Abdallah M. Azzeer, King Saud Univ. (Saudi Arabia); Andreas Tünnermann,Friedrich-Schiller-Univ. Jena (Germany); Theodor W. Hänsch, Ferenc Krausz,Max-Planck-Institut für Quantenoptik (Germany) and Ludwig-Maximilians-Univ.München (Germany)
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We discuss the power scalability of a bow-tie enhancement cavity, seeded by anYb-based fiber CPA system. The seed laser parameters are: 78 MHz repetitionfrequency, 200 fs pulse duration and 50 W of maximum average power. Peakintensities exceeding 10^14 W/cm^2 at the 22 µm-radius cavity focus(1/e^2-intensity) for several enhancement regimes with circulating powers of upto 72 kW are demonstrated. We find that the enhancement is primarily limited byintensity-dependent processes occurring in the cavity mirrors, such asthird-harmonic generation and nonlinear group delay dispersion and we proposesolutions to overcome these limitations. We report on our group's recentprogress regarding the applications of this system.

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