The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 16, 2004
Filed:
Jun. 04, 2001
Keith W. Goossen, Howell, NJ (US);
Other;
Abstract
A Vertical Cavity Surface Emitting Laser, VSEL. Prior-art VCSELs contain an optical cavity between two mirrors. Near one mirror are positioned current blockers which surround part of the cavity and prevent current from reaching regions of the cavity which are near edges of that mirror. If current reached those regions, lasing would occur there, and the light produced would be scattered by the nearby edges of the mirror. The current blockers reduce that scattering. However, the fabrication steps following those which create the current blockers are expensive. The invention eliminates the expensive steps by (1) placing a layer of gold atop the current blockers and the surrounded lasing region, (2) placing a dielectric layer of high index H atop the gold layer, and (3) placing a quarter-wave stack atop the high index dielectric layer, in the sequence L-H-L- . . . -H-L-H, wherein H represents a high index and L represents a low index. The gold delivers current to the cavity. Significantly, the stack (1) begins with an L adjacent the dielectric adjacent the gold and terminates with an H layer.