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@ARTICLE{Demirbas:479017,
      author       = {Demirbas, Uemit and Kellert, Martin and Thesinga, Jelto and
                      Reuter, Simon and Kärtner, Franz and Pergament, Mikhail},
      title        = {{A}dvantages of {YLF} host over {YAG} in power scaling at
                      cryogenic temperatures: direct comparison of {Y}b-doped
                      systems},
      journal      = {Optical materials express},
      volume       = {12},
      number       = {7},
      issn         = {2159-3930},
      address      = {Washington, DC},
      publisher    = {OSA},
      reportid     = {PUBDB-2022-02875},
      pages        = {2508 - 2528},
      year         = {2022},
      abstract     = {We have investigated the cryogenic performance of Yb:YAG
                      and Yb:YLF crystals in rod-geometry to understand the pros
                      and cons of each material for the development of ultrafast
                      lasers and amplifier systems. We have performed detailed
                      spectroscopic (absorption, emission, lifetime), temperature,
                      lasing, and thermal-lens measurements with Yb:YLF and Yb:YAG
                      crystals under almost identical conditions. Our analysis has
                      shown that despite the higher thermal conductivity of
                      Yb:YAG, due to its smaller quantum defect, the peak/average
                      temperatures reached under similar pumping conditions is
                      lower in Yb:YLF crystals. Moreover, since the YLF host has a
                      negative thermo-optic coefficient, that balances other
                      positive contributions to thermal lensing, overall Yb:YLF
                      rods possess a much weaker thermal lens than Yb:YAG under
                      similar conditions. As a result of these benefits, we have
                      shown that Yb:YLF rods perform better than Yb:YAG in
                      cryogenic lasing experiments in terms of attainable power
                      performance and laser output beam quality. In terms of gain
                      per pass, the Yb:YAG medium is superior, however, the gain
                      bandwidth is much broader in Yb:YLF systems that make it
                      more suitable for ultrafast pulse laser/amplifier
                      development. We have further shown that, the asymmetric
                      thermal lens behavior of Yb:YLF favors laser operation in
                      E//c axis over E//a axis. The comparison in this study has
                      been performed in rod geometry and for Yb-doping, however,
                      we believe that, to first order, the discussion could be
                      extended to YAG/YLF laser systems doped with other ions (Pr,
                      Nd, Er, Tm, Ho) and to other lasing geometries such as slab
                      and thin-disk.},
      cin          = {FS-CFEL-2},
      ddc          = {620},
      cid          = {I:(DE-H253)FS-CFEL-2-20120731},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / DFG project 390715994 - EXC 2056: CUI: Advanced
                      Imaging of Matter (390715994) / AXSIS - Frontiers in
                      Attosecond X-ray Science: Imaging and Spectroscopy (609920)
                      / DFG project 194651731 - EXC 1074: Hamburger Zentrum für
                      ultraschnelle Beobachtung (CUI): Struktur, Dynamik und
                      Kontrolle von Materie auf atomarer Skala (194651731)},
      pid          = {G:(DE-HGF)POF4-631 / G:(GEPRIS)390715994 /
                      G:(EU-Grant)609920 / G:(GEPRIS)194651731},
      experiment   = {EXP:(DE-H253)AXSIS-20200101 /
                      EXP:(DE-H253)CFEL-Exp-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000830078800010},
      doi          = {10.1364/OME.460445},
      url          = {https://bib-pubdb1.desy.de/record/479017},
}