A Study of Optical Design of Blu-ray Pickup Head System with Liquid Crystal Element

摘要

This research proposes a newly developed module: a newly developed optical design and a concept of active compensation method of Blu-ray pick up head system [1] with liquid crystal element. A hole-pattern electrode liquid crystal optics with input of external voltage are employed, that generates a symmetric non-uniform electrical field in the liquid crystal layer; this will direct liquid crystal molecules into the appropriate gradient refractive indices distribution, then resulting in convergence or divergence of specific light beam. From point view of optical design, liquid crystal optics delivers fast and the most important, active compensation through optical design when errors occur. Simulation and tolerance analysis work will be done by Code V [2] software inclusive of different tolerance analysis such as de-focus, tilt, de-center and their related compensation. The results conclude that optical design with liquid crystal optics as an active compensation device reach success with elimination of aberrations up to 46% compared to traditional ones.