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Proceedings Paper

Interferometric analysis of stress-induced birefringence in a rotating glass disk
Author(s): Peter J. de Groot; Ara Dergevorkian; Tod Erickson
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Paper 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.

Paper Details

Date Published: 30 June 1998
PDF: 7 pages
Proc. SPIE 3478, Laser Interferometry IX: Techniques and Analysis, (30 June 1998); doi: 10.1117/12.312941
Show Author Affiliations
Peter J. de Groot, Zygo Corp. (United States)
Ara Dergevorkian, Zygo Corp. (United States)
Tod Erickson, Zygo Corp. (United States)


Published in SPIE Proceedings Vol. 3478:
Laser Interferometry IX: Techniques and Analysis
Malgorzata Kujawinska; Gordon M. Brown; Mitsuo Takeda, Editor(s)

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