Abstract
In this paper, we review a number of digital versatile disk (DVD) pickup designs and present a new structure with two wavelengths using a 780 nm integrated optical unit (IOU) and a 650 nm laser diode (LD) in a single optical path. The 780 nm IOU acts as a sensor for the 650 nm system. Two returned beams of different wavelengths are diffracted by a holographic optical element (HOE) to the same detector. With this construction, the number of components is reduced and alignment is effectively simplified.
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