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

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Abstract

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 from4 I 1 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 from2 H 9/2. A significant population of the4 I 11/2 level and ESA at 970 nm are not present under 800 nm pumping.

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Authors and Affiliations

  1. Institute of Applied Physics, University of Berne, Sidlerstrasse 5, CH-3012, Berne, Switzerland

    M. Pollnau, W. Lüthy & H. P. Weber

  2. Institute of Inorganic Chemistry, University of Berne, Freiestrasse 3, CH-3009, Berne, Switzerland

    K. Krämer & H. U. Güdel

  3. Hughes Research Laboratories, 3011 Malibu Canyon Road, 90265, Malibu, CA, USA

    R. A. McFarlane

Authors
  1. M. Pollnau
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  2. W. Lüthy
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  3. H. P. Weber
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  4. K. Krämer
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  5. H. U. Güdel
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  6. R. A. McFarlane
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Pollnau, M., Lüthy, W., Weber, H.P. et al. Excited-state absorption in Er: BaY2F8 and Cs3Er2Br9 and comparison with Er: LiYF4 . Appl. Phys. B 62, 339–344 (1996). https://doi.org/10.1007/BF01081195

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  • DOI: https://doi.org/10.1007/BF01081195

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