Abstract
What is to our knowledge the first high-density (>1012 bits/cm3) optical recording of digital information in a multilayered, three-dimensional format is reported. Information is written as submicrometer volume elements of increased refractive index in a photopolymer by two-photon excitation of a photoinitiator at the waist of a highly focused beam from a colliding-pulse mode-locked laser. Quadratic dependence of two-photon excitation on intensity confines polymerization to the focal volume. Information is read with sufficient axial resolution by differential interference contrast microscopy. This write-once, read-many technique should increase the capacity of the spinning disk format by 100-fold.
© 1991 Optical Society of America
Full Article | PDF ArticleMore Like This
Daniel Day, Min Gu, and Andrew Smallridge
Opt. Lett. 24(14) 948-950 (1999)
M. E. Marhic
Opt. Lett. 16(16) 1272-1273 (1991)
Min Gu and Daniel Day
Opt. Lett. 24(5) 288-290 (1999)