Mr. Daniel E. Eakins Profile

Daniel E. Eakins

at Washington State Univ

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Proceedings Article | 16 June 2003 Paper

Electron microscopy of compound oxide laser materials

Daniel Eakins, Joel LeBret, M. Norton, David Bahr, John Dumm

Proceedings Volume 4970, (2003) https://doi.org/10.1117/12.479167

KEYWORDS: Crystals, YAG lasers, Neodymium, Diffraction, Transmission electron microscopy, Particles, Nd:YAG lasers, Laser crystals, Reflection, Scanning electron microscopy

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Oxide single crystals, such as yttrium aluminum garnet (YAG) and yttrium orthovanadate (YVO₄), are important host crystals for solid-state laser applications. These crystals are often grown by the Czochralski process and are doped with neodymium during growth. The microstructure of the resultant crystal affects the overall laser performance and it is necessary to be able to characterize grown-in defects in the material. Scanning electron microscopy has been used to examine the fracture surfaces of YAG and has shown the presence of microscopic voids, which act as stress concentrators and in some cases appear to be the cause of fracture. Transmission electron microscopy (TEM) has been used to characterize various defects in both YAG and YVO₄ crystals. The defects found depend on the growth conditions, specifically the Nd concentration in the crystal and the position within the boule. One of the most common defects identified in both materials were microscopic spherical particles. In YAG these particles appeared to be located primarily in the core regions and analysis of high resolution images indicate that they are due to regions that are both compositionally and orientationally different from the matrix phase. Direct observation of dislocations in YVO₄ was made using TEM. In YAG only indirect evidence for dislocations could be found from the observation of river marks on fracture surfaces.

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