26 March 2015 Transmitted beam profile for determining bulk scattering in transparent ceramics
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Bulk scattering in polycrystalline laser materials (PLM), due to non-uniform refractive index distribution across the bulk, is regarded as the primary loss mechanism leading to degradation of laser performance with higher threshold and lower output power. There is a need for characterization techniques, towards identifying bulk scatter and assessing the quality. Assessment of optical quality and the identification of bulk scatter have been by simple visual inspection of thin samples of PLMs, thus making the measurements highly subjective and inaccurate. Transmitted Beam Wavefront Profiling (TBWP) allows for the direct and quick imaging of the distortions introduced by bulk scattering, which is a direct manifestation of the presence of refractive index inhomogeneities in the PLM sample. As a laser beam propagates through the PLM sample, different regions of the incident beam experience different refractive index profiles, which cause spatial distortions to the beam. TBWP is able to directly and quickly image these distortions introduced to a propagating laser beam caused by the presence of bulk scattering in the PLMs.
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Saurabh Sharma, Saurabh Sharma, J. Keith Miller, J. Keith Miller, Ramesh K. Shori, Ramesh K. Shori, Mark S. Goorsky, Mark S. Goorsky, "Transmitted beam profile for determining bulk scattering in transparent ceramics", Proc. SPIE 9342, Solid State Lasers XXIV: Technology and Devices, 934222 (26 March 2015); doi: 10.1117/12.2175769; https://doi.org/10.1117/12.2175769


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