Method and optical profiler

Details Method and optical profiler Method and optical profiler

2011-03-29

2011-03-29

Chowdhury, Tarifur R. (Department: 2886)

Optics: measuring and testing

Shape or surface configuration

C356S495000

Reexamination Certificate

active

07916308

ABSTRACT:
An optical profiler for an ultra-smooth surface, such as a magnetic recording disk, provides for a normally incident beam deflection against the target surface to be profiled. A linearly polarized laser light of a first polarization is focused on the target surface in a normally incident direction. The beam is reflected back along its original path from the focal point. Optics are provided that change the polarization of the reflected beam to a second polarization. A reflected beam, with a second polarization, is directed onto a position sensitive detector for evaluation.

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