Recording and reading temperature tolerance in holographic data storage, in relation to the anisotropic thermal expansion of a photopolymer medium.
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.
Tanaka
Tomiji
T
Core Device Development Group, Sony Corporation, Tokyo 141-0001, Japan. tomiji.tanaka@jp.sony.com
D016880:Anisotropy; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006696:Holography / Q000295:instrumentation*; D016247:Information Storage and Retrieval; D008027:Light; D008422:Materials Testing; D008962:Models, Theoretical; D055096:Optical Devices; D011108:Polymers / Q000737:chemistry*; D012542:Scattering, Radiation; D013696:Temperature
D011108:Polymers