Related Experiment Video
Updated: Jun 6, 2026

Bringing the Visible Universe into Focus with Robo-AO
Published on: February 12, 2013
Abstract:
A servo system for the correction of disk tilt in optical disk data storage is proposed, and its basic concepts are demonstrated by the use of a static system in which the disk does not spin. Because disk tilt produces primarily coma in the beam focused onto the disk, the system uses a variable coma generator to produce an equal and opposite amount of coma as that caused by the tilted disk. The magnitude and direction of disk tilt are detected by the use of the light reflected from the front facet of the disk substrate.
More Related Videos
07:03Medical-grade Sterilizable Target for Fluid-immersed Fetoscope Optical Distortion Calibration
Published on: February 23, 2017
09:01Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
Published on: April 4, 2017
Related Concept Videos
Distance Corrections
Influence of Earth's Curvature and Atmospheric Refraction on Leveling
Differential Leveling
Adjusting a Traverse
Doppler Effect - II
Doppler Effect - I