17 September 1997 Interferometric characterization of stress birefringence in germanium
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Proceedings Volume 3098, Optical Inspection and Micromeasurements II; (1997) https://doi.org/10.1117/12.281204
Event: Lasers and Optics in Manufacturing III, 1997, Munich, Germany
Abstract
We report on the characterization of the refractive index homogeneity in large blanks of Czochralski-grown Germanium, for thermal imaging use. With a phase-measuring Twyman-Green interferometer working at 10.6 micrometers , a map of the index of refraction with an accuracy better than 1 10-5 can be obtained for blanks which do not exhibit high birefringence.In the other case, principal stresses in the disks can be determined through the effect of birefringence on the interferogram, if the stresses are distributed cylinder-symmetrically in the plane of the disk. Relations between stresses, transmittance, and electrical resistivity of the material are observed.
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Ben Depuydt, Pierre Michel Boone, Piet Union, Peter F. Muys, Dirk Vyncke, Claus Goessens, "Interferometric characterization of stress birefringence in germanium", Proc. SPIE 3098, Optical Inspection and Micromeasurements II, (17 September 1997); doi: 10.1117/12.281204; https://doi.org/10.1117/12.281204
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