High Density Optical Disk Recording System
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-27
A technique is described whereby optical disk high-density recording is obtained by utilizing a low-power laser of short wavelength in conjunction with higher-powered longer wavelength laser concentration. The low-power laser is used for supplying joule heating. This technique makes it possible to write very small spots during the writing of information, enabling higher density recording to be accomplished. In prior art, the ability to provide high-density recording onto optical disks required high laser power, which is only available for long wavelengths, approximately 800 nm. So as to increase the recording speed further, laser power has been increased through the use of high-power (40 mw) injection lasers. However, these lasers have a limited life cycle when compared to low-powered lasers (5 mw).