Using confocal Raman and fluorescence spectroscopic imaging in 3-dimensions, we show direct evidence of inhomogeneous Nd3+distribution across grain boundaries (GBs) in Nd3+: YAG laser ceramics. It is clearly shown that Nd3+segregation takes place at GBs leading to self-fluorescence quenching which affects a volume fraction as high as 20%. In addition, we show a clear trend of increasing spatial inhomogeneities in Nd3+concentration when the doping levels exceeds 3 at%, which is not detected by standard spectrometry techniques. These results could point the way to further improvements in what is already an impressive class of ceramic laser materials.
|Original language||English (US)|
|Number of pages||9|
|State||Published - Apr 28 2008|
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics