Applied Physics B

, Volume 62, Issue 4, pp 339–344 | Cite as

Excited-state absorption in Er: BaY2F8 and Cs3Er2Br9 and comparison with Er: LiYF4

  • M. Pollnau
  • W. Lüthy
  • H. P. Weber
  • K. Krämer
  • H. U. Güdel
  • R. A. McFarlane


The influence of Excited-State Absorption (ESA) on the green laser transition and the overlap of Ground-State Absorption (GSA) and ESA for 970 nm upconversion pumping in erbium is investigated in Er3+ : BaY2F8 and Cs3Er2Br9. Results are compared to Er3+ : LiYF4. In Er3+: BaY2F8, a good overlap between GSA and ESA is found at 969 nm in one polarization direction. The emission cross section at 550 nm is a factor of two smaller than in LiYF4. In Cs3Er2Br9, the smaller Stark splitting of the levels shifts the wavelengths of the green emission and ESA from4I1 3/2 off resonance. It enhances, however, ground-state reabsorption. The emission cross section at 550 nm is comparable to LiYF4. Upconversion leads to significant green fluorescence from2H9/2. A significant population of the4I11/2 level and ESA at 970 nm are not present under 800 nm pumping.


42.55.Rz 42.60.Lh 78.45. + h 


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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • M. Pollnau
    • 1
  • W. Lüthy
    • 1
  • H. P. Weber
    • 1
  • K. Krämer
    • 2
  • H. U. Güdel
    • 2
  • R. A. McFarlane
    • 3
  1. 1.Institute of Applied PhysicsUniversity of BerneBerneSwitzerland
  2. 2.Institute of Inorganic ChemistryUniversity of BerneBerneSwitzerland
  3. 3.Hughes Research LaboratoriesMalibuUSA

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