Abstract
A mixing up-conversion excitation phenomenon in Er3+/Yb 3+-codoped aluminum germanate (Na2O-MgO-Al 2O3-GeO2, NMAG for short) glasses for K +-Na+ ion-exchanged waveguides was observed and characterized. The green and red up-conversion luminescence of Er3+ is due to a two-photon excitation process under low-power excitation of a 974 nm diode laser, however, with increasing the pumping power, the green emission turns to follow a combination of two- and three-photon excitation effects while the red one still agrees with a two-photon excitation law. Under high-power pumping, owing to potential thermal effect, the population ratio between the 2H11/2 and 4S3/2 levels adjusts acutely, which results in a distinct exhibition in 2H11/2 → 4I15/2 and 4S3/2 → 4I15/2 emission transitions. Green transmission trace has been observed in K+-Na+ ion-exchanged Er 3+/Yb3+-codoped NMAG glass waveguide and it provides an original reference in developing visible waveguide amplifiers and lasers.
| Original language | English |
|---|---|
| Pages (from-to) | 133-137 |
| Number of pages | 5 |
| Journal | Journal of Alloys and Compounds |
| Volume | 503 |
| Issue number | 1 |
| DOIs | |
| State | Published - 30 Jul 2010 |
| Externally published | Yes |
Keywords
- Germanate glasses
- Mixing up-conversion process
- Rare-earth ions
- Visible waveguide
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