Abstract

The light path of the system that was modeled is shown in Figure 1. The system consists of; (1) a laser pen that produces a uniform beam of collimated light, (2) a turning mirror to point the beam in the correct direction, (3) a rhombic polarizing beamsplitter to separate the incoming and outgoing beam and to set the proper laser orientation, (4) a quarter waveplate to reverse the direction of polarization between the incoming and outgoing beam, (5) an objective lens to focus the light onto the disk, (6) a servo system to move the objective lens, (7) a pregrooved disk that introduces the tracking signal, (8) a toric lens to develop the astigmatic focusing signal, (9) and a quad detector to read the focus, tracking, and data signals. The optical system is contained in a carriage which can move radially along the disk to access different areas of the disk.

© 1984 Optical Society of America