Open AccessRecording and reading temperature tolerance in holographic data storage, in relation to the anisotropic thermal expansion of a photopolymer medium
Author(s) -
Tomiji Tanaka
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.014132
Subject(s) - optics , holographic data storage , materials science , holography , thermal expansion , lens (geology) , compensation (psychology) , reading (process) , substrate (aquarium) , photopolymer , wavelength , anisotropy , optoelectronics , physics , composite material , polymer , psychology , oceanography , political science , law , psychoanalysis , polymerization , geology
In holographic data storage, it is difficult to retrieve data if the temperature difference between recording and reading exceeds 2 K. To widen this tolerance, a compensation method--adjusting the wavelengths and incident directions of the recording and reading beams--has been proposed. In this paper, for the first time, a method for calculating the recording and reading temperature tolerance using this compensation is introduced. To widen the narrow tolerance, typically +/- 10 K, it is effective to increase the coefficient of thermal expansion (CTE) of the substrate or decrease the CTE of the photopolymer. Although reducing the Numerical aperture of the objective lens is also effective, it degrades the recording density.