Method for laser texturing magnetic recording disk

摘要

A method for controlling the laser texturing of a magnetic disk by using a texturing laser system to create texturing bumps and an analyzing laser system to determine texture bump height and to provide feedback to the texturing laser system. From an angular distribution of an array of diffracted light intensities of the texturing bumps, the intensity of a first diffraction peak (Int1) and its array position (P1) are determined and utilized to calculate the average bump height h according to the equation:where A, B and C are constants that are determined for a batch of disks by taking a representative sample of disks and texturing them with differing laser energies within the energy level range.