HIGH-EFFICIENCY HOES FOR HOLOGRAPHIC DVD PICKUP HEADS

It is well known that holographic hybrid pickup heads have a number of advantages in terms of size, modularity, and perhaps cost, but are le ss efficient than conventional discrete component type pickup heads, W e introduce a new design for the HOE which places the 3-beam grating o n the same surface with the holographic beamsplitter and utilizes ligh t that would otherwise be wasted to create the satellite beams for 3-b eam tracking, Efficiency is gained by avoiding the similar to 35% loss typically associated with the 3-beam grating and by blazing the holog raphic beamsplitter.