Spectroscopic and laser properties of Cr3+:Yb3+:Er3+: fluoride phosphate glass
| Autor: | E. Heumann, Doris Ehrt, M. Ledig, W. Seeber |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Materials science
Analytical chemistry Acceptor Fluorescence Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Ion Phosphate glass chemistry.chemical_compound chemistry Stimulated emission Electrical and Electronic Engineering Absorption (electromagnetic radiation) Fluoride Excitation |
| Zdroj: | Optical and Quantum Electronics. 22:S107-S122 |
| ISSN: | 1572-817X 0306-8919 |
| DOI: | 10.1007/bf02089004 |
| Popis: | Sensitization of the fluorescence of Er3+ in fluoride phosphate glass containing up to 20 mol% phosphates by codoping with Cr3+ and Yb3+ is shown. The low order of ligand field strength for Cr3+ (Dq/B=2.04) results in broad Cr3+ fluorescence overlapping the Yb3+ absorption. The electronic energy transfer efficiency approaches 100%. Deviations of donor decay from the Forster law are interpreted in terms of the inhomogeneously acceptor distribution. The electronic energy transfer efficiency of Yb3+ → Er3+ reaches a maximum value of 75% for glasses containing 20 mol% phosphates. The transfer is shown to be migrationally accelerated by means of GAF-LAF-FB theory. From Judd-Ofelt parameters a stimulated emission cross-section for the transition4I13/2 →4I15/2 of Er3+ of 6.2×10−20 cm2 is derived. The c.w. laser action of Er3+ by Cr3+ excitation and double-step energy transfer is shown. The output is tuned continuously from 1536 to 1596 nm. Flashlamp pumping is also shown. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink