Abstract
Within the POLARIS project multi-pass amplification to the 10 joule level for a femtosecond CPA laser system has been achieved by diode-pumping an Yb3+ doped fluoride-phosphate glass disk with a total energy of 240 J. The collimated light of 40 diode stacks is focussed onto a circular area of the glass disk with a diameter of 18 mm. A two-sided ring shaped setup is used for axially symmetric pumping. We developed a computer aided optimization routine for the positioning of single pump foci to gain a smooth homogeneously distributed, top-hat shaped pump profile. The homogeneity of the pump light distribution was improved substantially by this new method.
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42.55.Xi; 42.60.By; 42.60.Jf
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Siebold, M., Podleska, S., Hein, J. et al. Fluence homogenization of a 240 J-diode-laser pump system for a multi-pass solid state laser amplifier. Appl. Phys. B 81, 615–619 (2005). https://doi.org/10.1007/s00340-005-1942-y
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DOI: https://doi.org/10.1007/s00340-005-1942-y