Patent ID: 8000206
Filing Date: 2011-08-16
Classification: G03H,G11B

Abstract:
1. A method for pre-exposure or curing of an optical storage medium, the method comprising the steps of: generating a coherent light beam, imprinting a first spatial intensity or phase distribution over a cross section of the coherent light beam, illuminating an area of the optical storage medium with the coherent light beam having the first spatial intensity or phase distribution in a first exposure steps, imprinting a second spatial intensity or phase distribution over the cross section of the coherent light beam, wherein the first and the second spatial intensity or phase distributions have a low correlation, and illuminating the area of the optical storage medium with the coherent light beam having the second spatial intensity or phase distribution in a second exposure step, wherein an exposure dose of the first exposure step and an exposure dose of the second exposure step are smaller than an exposure dose required for recording a detectable data pattern.