| About this Abstract |
| Meeting |
Materials Science & Technology 2012
|
| Symposium
|
Novel Sintering Processes and News in Conventional Sintering and Grain Growth
|
| Presentation Title |
Effect of Si-Induced Defects on 1um-Absorption Losses in Laser-Grade YAG Ceramics |
| Author(s) |
Romain Gaume |
| On-Site Speaker (Planned) |
Romain Gaume |
| Abstract Scope |
High sensitivity optical absorption at 1 µm was measured in forty undoped and Nd-doped YAG (Y3Al5O12) transparent ceramics and single crystals using photothermal common-path interferometry (PCI). Concurrently, chemical trace analysis was performed on those samples by glow discharge mass-spectroscopy (GDMS). Silicon and calcium were found to be the major impurities with concentrations up to 250 wt ppm. A univocal linear correlation between the Si content and the absorption loss at 1 µm is revealed and a possible mechanism for the formation of Si-induced color centers based on a bound polaron model is discussed. Solutions to reduce this optical absorption in ceramics are also proposed. |
| Proceedings Inclusion? |
Undecided |