Effects of higher order aberrations on beam shape in an optical recording system
- Author
- Wang, Mark S.
- Published
- Mar 15, 1992.
- Physical Description
- 1 electronic document
- Additional Creators
- Milster, Tom D.
Online Version
- hdl.handle.net , Connect to this object online.
- Restrictions on Access
- Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access - Summary
- An unexpected irradiance pattern in the detector plane of an optical data storage system was observed. Through wavefront measurement and scalar diffraction modeling, it was discovered that the energy redistribution is due to residual third-order and fifth-order spherical aberration of the objective lens and cover-plate assembly. The amount of residual aberration is small, and the beam focused on the disk would be considered diffraction limited by several criteria. Since the detector is not in the focal plane, even this small amount of aberration has a significant effect on the energy distribution. We show that the energy redistribution can adversely affect focus error signals, which are responsible for maintaining sub-micron spot diameters on the spinning disk.
- Other Subject(s)
- Collection
- NASA Technical Reports Server (NTRS) Collection.
- Note
- Document ID: 19930006326.
Accession ID: 93N15515.
Research Studies on Advanced Optical Module(Head Designs for Optical Data Storage; p 147-173. - Terms of Use and Reproduction
- No Copyright.
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