Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1997-07-17
1998-11-03
Swann, Tod R.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369122, 372 45, 372 96, G11B 700
Patent
active
058319603
ABSTRACT:
An integrated vertical cavity surface emitting laser (VCSEL) pair for use in an optical pickup head for high density optical storage applications and a method of fabrication. The VCSEL pair includes a high power VCSEL capable of emitting a power output of at least 15 mW and a low power VCSEL capable of emitting a power output in a range of 1-4 mW. A phase shift mask is integrated with the high power VCSEL 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 low power VCSEL emission is focused into a Gaussian beam profile for data read applications. The integrated VCSEL pair is utilized in an optical pickup head capable of high density read and write applications for both CDs and DVDs.
REFERENCES:
patent: 5245622 (1993-09-01), Jewell et al.
patent: 5530715 (1996-06-01), Sheih et al.
patent: 5548610 (1996-08-01), Bouadma et al.
Claisse Paul
Jiang Wenbin
Lebby Michael S.
Chu Kim-Kwok
Motorola Inc.
Parsons Eugene A.
Swann Tod R.
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