Excited-state absorption in Er: BaY2F8 and Cs3Er2Br9 and comparison with Er: LiYF4 |
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| Authors: | M. Pollnau W. Lüthy H. P. Weber K. Krämer H. U. Güdel R. A. McFarlane |
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| Affiliation: | (1) Institute of Applied Physics, University of Berne, Sidlerstrasse 5, CH-3012 Berne, Switzerland;(2) Institute of Inorganic Chemistry, University of Berne, Freiestrasse 3, CH-3009 Berne, Switzerland;(3) Hughes Research Laboratories, 3011 Malibu Canyon Road, 90265 Malibu, CA, USA |
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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 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. |
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| Keywords: | 42.55.Rz 42.60.Lh 78.45. + h |
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