Fabrication of Laser Beam Axis Compensator by Photonic Crystal Technique for Optical Pickup Units

摘要

A laser beam axis compensator was fabricated for an optical pickup unit with blue and red lasers. The device consisted of multiwavelength wave plates and a double-refractive-index material. The wave plates were realized by a photonic crystal technique. By measuring the beam profiles of the blue and red lasers, the device was confirmed to function as a laser axis compensator. Under ll0 μm laser beam axis shift setting conditions, readout signal patterns from an optical disc were measured.