Optical pickup head including a coherent first order mode laser

Details Optical pickup head including a coherent first order mode laser Optical pickup head including a coherent first order mode laser

1997-07-17

2000-08-29

Young, W. R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369122, G11B 708

Patent

active

061118397

ABSTRACT:
An optical pickup head for high density optical storage applications and a method of fabrication including a first order mode light source and a phase shift mask. The light source is capable of emitting a power output of at least 10 mW. The phase shift mask positioned to allow for a 180.degree. shift in light emitted therethrough, thereby creating a reduced focal spot size for high density data write applications. The optical pickup head capable of high density read and write applications for both CDs and DVDs.

REFERENCES:
patent: 5446754 (1995-08-01), Jewell et al.
patent: 5757741 (1998-05-01), Jiang et al.
patent: 5802036 (1998-09-01), Ohba et al.
patent: 5886972 (1999-03-01), Jiang et al.
patent: 5892749 (1999-04-01), Yamanaka

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