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.
Original language | Undefined |
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Article number | 10.1007/BF01081195 |
Pages (from-to) | 339-344 |
Number of pages | 6 |
Journal | Applied physics B: Lasers and optics |
Volume | 62 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1996 |
Keywords
- IOMS-APD: Active Photonic Devices
- IR-70112
- EWI-17579