Steven Douglas Patterson

US Patent:

6587492, Jul 1, 2003

Filed:

Mar 1, 2001

Appl. No.:

09/797188

Inventors:

Steven G. Patterson - Stevenson Ranch CA
Rajeev J. Ram - Cambridge MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

H01S 500

US Classification:

372 43, 372 46

Abstract:

A bipolar cascade-ARROW laser includes a plurality of core regions, at least one spacer disposed between each the plurality of core regions with each of the at least one spacers provided from a material having an index of refraction which is higher than an index of refraction of a material from which the core regions are provided. The bipolar cascade-ARROW laser further includes an anti-reflector disposed against each of the outermost ones of the core regions and at least one quantum well disposed in each of the plurality of core regions.

US Patent:

62069667, Mar 27, 2001

Filed:

Sep 30, 1998

Appl. No.:

9/164414

Inventors:

Layton C. Hale - Livermore CA
Terry N. Malsbury - Tracy CA
Steven R. Patterson - Concord NC

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

B05C13/00

US Classification:

118500

Abstract:

A pedestal optical substrate that simultaneously provides high substrate dynamic stiffness, provides low surface figure sensitivity to mechanical mounting hardware inputs, and constrains surface figure changes caused by optical coatings to be primarily spherical in nature. The pedestal optical substrate includes a disk-like optic or substrate section having a top surface that is coated, a disk-like base section that provides location at which the substrate can be mounted, and a connecting cylindrical section between the base and optics or substrate sections. The connecting cylindrical section may be attached via three spaced legs or members. However, the pedestal optical substrate can be manufactured from a solid piece of material to form a monolith, thus avoiding joints between the sections, or the disk-like base can be formed separately and connected to the connecting section. By way of example, the pedestal optical substrate may be utilized in the fabrication of optics for an extreme ultraviolet (EUV) lithography imaging system, or in any optical system requiring coated optics and substrates with reduced sensitivity to mechanical mounts.