Single laser direct read after write system (draw)

Details Single laser direct read after write system (draw) Single laser direct read after write system (draw)

1988-11-22

1990-08-14

Richardson, Robert L.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369116, G11B 700

Patent

active

049493116

ABSTRACT:
A single laser system utilizes a grating to provide a shifted beam and a nonshifted beam which are directed through a polarized beamsplitter in the nonsplitting direction. The beams are directed through a 1/4 wave plate by means of a folding mirror. The beams from the 1/4 wave plate are focused onto the recording surface to generate a write spot and a DRAW (direct read after write) spot. The DRAW spot is positioned behind the write spot at a distance of n+1/2 bits. Reflections from the DRAW spot are collimated back through the 1/4 wave plate onto the folding mirror. The folding mirror directs the collimated DRAW verify spot to the polarized beamsplitter where it is reflected through a lens to a DRAW spot photodetector for detection. In a like manner, read reflections are directed back to be focused on a read photodetector.

REFERENCES:
patent: 4345261 (1982-08-01), Wilkinson
patent: 4571716 (1986-02-01), Szerlip
patent: 4599717 (1986-07-01), Bracht et al.
patent: 4694447 (1987-09-01), Cohen et al.

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