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

Markus Pollnau, W. Lüthy, H.P. Weber, K Krämer, H.U. Güdel, R.A. McFarlane

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    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 from 4I13/2 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 from 2H9/2. A significant population of the 4111/2 level and ESA at 970 nm are not present under 800 nm pumping.
    Original languageUndefined
    Article number10.1007/BF01081195
    Pages (from-to)339-344
    Number of pages6
    JournalApplied physics B: Lasers and optics
    Issue number4
    Publication statusPublished - 1996


    • IOMS-APD: Active Photonic Devices
    • IR-70112
    • EWI-17579

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