Close

Search

Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Industrial Photonics Photonics Showcase Photonics ProdSpec Photonics Handbook
More News
SPECIAL ANNOUNCEMENT
2016 Photonics Buyers' Guide Clearance! – Use Coupon Code FC16 to save 60%!
share
Email Facebook Twitter Google+ LinkedIn Comments

Coatings Control Aberration in Optical Pickups

Photonics Spectra
Nov 2000
The demand for more-compact optical disk drives in laptops has created a problem: The shorter image-to-object distances result in astigmatism. The solution has been to introduce aberrations into the plastic lenses in the optical pickups, but this can be costly and time-consuming. Kai Man Hung of Sony Precision Engineering Center in Singapore has presented a simpler and more economical plan in the form of antireflection coatings.

Hung, who reported the findings in the Aug. 1 issue of Applied Optics, found that applying a strip of nonrotationally symmetrical coating to aspheric objective lenses of poly(methyl methacrylate) and Zeonex resin can reduce astigmatism by as much as 73 percent. The coatings had a negligible effect on third-order coma and spherical aberration.


Comments
Terms & Conditions Privacy Policy About Us Contact Us
back to top

Facebook Twitter Instagram LinkedIn YouTube RSS
©2016 Photonics Media
x Subscribe to Photonics Spectra magazine - FREE!