Temperature dependence of the birefringence of optical-disk substrate

Timothy D. Goodman, Ronald E. Gerber, M. Mansuripur

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Injection-molded polycarbonate substrates are used predominantly in read-only, write-once, phasechange and magneto-optic disks for data storage. The in-plane and vertical birefringences of these substrates adversely affect the performance of optical data-storage systems. The disks are typically expected to operate in the ambient temperature range of 5–50 °C. We have investigated the behavior of the in-plane and vertical birefringences of a polycarbonate disk substrate in this temperature range using a custom-built ellipsometer. This study reveals that the in-plane birefringence changes dramatically within the investigated range of temperatures, whereas the vertical birefringence remains essentially constant. We suspect that the change in birefringence is due primarily to thermally induced stress in the substrate.

Original languageEnglish (US)
Pages (from-to)3031-3038
Number of pages8
JournalApplied optics
Issue number16
StatePublished - Jun 1 1996


  • Optical data storage
  • Polycarbonate disk substrate
  • Substrate birefringence

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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