Radial tilt compensation method of holographic disk drive

Tilt measurement and compensation algorithm for holographic data storage with optimized quadratic windows

“…Therefore, galvano mirror and two lenses changes incident angle of probe beam without changing of location on holographic disc. 19) When both tangential and radial tilt occur simultaneously, there are complex effects on the image. Indeed, each tilt error signal is affected by the other.…”

“…There have been many studies to detect and compensate for tilt. [15][16][17][18][19][20][21] However, compensation methods that only consider the case when tangential tilt or radial tilt is generated separately have been reported. To compensate for complex tilt, measurement and compensation methods using an intelligent algorithm have been proposed; however, there are limitations in terms of calculation time and complexity.…”

Disturbances Analysis Considering an Effective Servo System for Holographic Disc Drive

“…Various error measurement and compensation methods tailored to HDS characteristics have been proposed. [7][8][9][10][11][12][13][14][15][16][17] However, previous studies have not considered stop-go rotation of the spindle, which should be applicable to the rotation mechanism of the HDS system. In this paper, the adaptive servo method is proposed based on analysis results regarding the disturbance characteristics of stop-go rotation.…”