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Three-dimensional grain boundary spectroscopy in transparent high power ceramic laser materials

Three-dimensional grain boundary spectroscopy in transparent high power ceramic laser materials

Optics Express 16(9): 5965-5973

Using confocal Raman and fluorescence spectroscopic imaging in 3-dimensions, we show direct evidence of inhomogeneous Nd(3+) distribution across grain boundaries (GBs) in Nd(3+):YAG laser ceramics. It is clearly shown that Nd(3+) 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 Nd(3+) 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.

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Accession: 056570091

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PMID: 18545297

DOI: 10.1364/oe.16.005965

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