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

Pollnau, M. and Lüthy, W. and Weber, H.P. and Krämer, K. and Güdel, H.U. and McFarlane, R.A. (1996) Excited-state absorption in Er:BaY2F8 and Cs3Er2Br9 and comparison with Er:LiYF4. Applied physics B: Lasers and optics, 62 (4). pp. 339-344. ISSN 0946-2171

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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 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.
Item Type:	Article
Copyright:	© 1996 Springer
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Link to this item:	http://purl.utwente.nl/publications/70112
Official URL:	http://dx.doi.org/10.1007/BF01081195
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