30 June 1998 Interferometric analysis of stress-induced birefringence in a rotating glass disk
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Abstract
Centripetal forces in a rotating glass disk generate mechanical strains that are visible in polarized light. Dynamic stress birefringence in rotating disks has a practical effect on several classes of optical instruments, including flying-height testers for the data storage industry. We provide a model for stress-induced polarization effects, and describe an interferometric technique for mapping birefringence in a 100-nm diameter disk spinning at 12,000 rpm. The polarization interferometer employs a laser diode and a homodyne phase receiver to detect polarization- dependent phase shifts as small as 1 mrad at a data rate of 250 kHz.
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Peter J. de Groot, Peter J. de Groot, Ara Dergevorkian, Ara Dergevorkian, Tod Erickson, Tod Erickson, "Interferometric analysis of stress-induced birefringence in a rotating glass disk", Proc. SPIE 3478, Laser Interferometry IX: Techniques and Analysis, (30 June 1998); doi: 10.1117/12.312941; https://doi.org/10.1117/12.312941
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