Applied Physics B

, Volume 117, Issue 2, pp 597–603 | Cite as

Diode-pumped Yb:CaF\(_2\) multipass amplifier producing 50 mJ with dynamic analysis for high repetition rate operation

  • Florence FriebelEmail author
  • Alain Pellegrina
  • Dimitris N. Papadopoulos
  • Patrice Camy
  • Jean-Louis Doualan
  • Richard Moncorgé
  • Patrick Georges
  • Frédéric Druon


The dynamic thermal issues of the Yb:CaF\(_{2}\) crystals within a multi-tens-mJ-energy multipass amplifier operating in the 20–100 Hz repetition rate range and pumped in quasi-cw regime have been studied at different timescales. Thermal response times of the system have been precisely investigated and analyzed, for the first time to our best knowledge in such amplifiers. This study includes a dual timescale analysis: in the long-time-scale (second) with direct thermography mapping and in the millisecond range with thermal lensing in a pump-probe configuration. Very atypical positive lens behavior with fluorites will also be presented and discussed. This complete analysis is used to demonstrate the capability of \(\hbox {Yb:CaF}_{2}\) multipass amplifier systems for operating the amplifier at 20 Hz with 57 mJ and 100 Hz with 32-mJ stable regime. Indeed, high repetition rate multipass amplifier has been realized for the first time with \(\hbox {Yb:CaF}_{2}\) and for this energy. The results have been analyzed precisely to take into account the thermal issues and excellent beam quality, with a \(M^2\) of 1.1. The pointing stability of 20 μrad has been measured documenting the reliability of the high repetition rate mJ amplifier.


Pump Pulse Thermal Lens High Repetition Rate Absorb Pump Power Dioptric Power 
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This work has been partially supported by the French National Research Agency (ANR) through the Femtocryble program and by the ILE 07-CPER 017-01 contract.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Florence Friebel
    • 1
    Email author
  • Alain Pellegrina
    • 2
  • Dimitris N. Papadopoulos
    • 2
  • Patrice Camy
    • 3
  • Jean-Louis Doualan
    • 3
  • Richard Moncorgé
    • 3
  • Patrick Georges
    • 1
  • Frédéric Druon
    • 1
  1. 1.Laboratoire Charles Fabry, Institut d’OptiqueCNRSPalaiseau CedexFrance
  2. 2.Laboratoire d’Utilisation des Lasers Intenses, CNRS, Ecole Polytechnique, CEAUniv P. et M. CuriePalaiseauFrance
  3. 3.Centre de recherché sur les Ions, les Matériaux et la Photonique (CIMAP), UMR 6252 CEA-CNRS-ENSI CaenUniversité de CaenCaenFrance

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