Gordon A Keeler

US Patent:

7218388, May 15, 2007

Filed:

Dec 1, 2004

Appl. No.:

11/001235

Inventors:

Gordon A. Keeler - Albuquerque NM, US
Darwin K. Serkland - Albuquerque NM, US

Assignee:

Sandia Corporation - Albuquerque NM

International Classification:

G01N 21/00

US Classification:

356 731

Abstract:

An apparatus for locating a fault within an optical fiber is disclosed. The apparatus, which can be formed as a part of a fiber-optic transmitter or as a stand-alone instrument, utilizes a vertical-cavity surface-emitting laser (VCSEL) to generate a test pulse of light which is coupled into an optical fiber under test. The VCSEL is subsequently reconfigured by changing a bias voltage thereto and is used as a resonant-cavity photodetector (RCPD) to detect a portion of the test light pulse which is reflected or scattered from any fault within the optical fiber. A time interval Δt between an instant in time when the test light pulse is generated and the time the reflected or scattered portion is detected can then be used to determine the location of the fault within the optical fiber.

US Patent:

7393145, Jul 1, 2008

Filed:

Nov 22, 2005

Appl. No.:

11/285244

Inventors:

Rick C. Stevens - Apple Valley MN, US
Charles J. Kryzak - Mendota Heights MN, US
Gordon A. Keeler - Albuquerque NM, US
Darwin K. Serkland - Albuquerque NM, US
Kent M. Geib - Tijeras NM, US
William P. Kornrumpf - Schenectady NY, US

Assignee:

Lockheed Martin Corporation - Bethesda MD
Sandia Corporation - Albuquerque NM

International Classification:

G02B 6/43

US Classification:

385 89, 25022715

Abstract:

One apparatus embodiment includes an optical emitter and a photodetector. At least a portion of the optical emitter extends a radial distance from a center point. The photodetector provided around at least a portion of the optical emitter and positioned outside the radial distance of the portion of the optical emitter.

US Patent:

7434299, Oct 14, 2008

Filed:

Nov 28, 2007

Appl. No.:

11/946077

Inventors:

David Dennis Gill - Albuquerque NM, US
Gordon A. Keeler - Albuquerque NM, US
Darwin K. Serkland - Albuquerque NM, US
Sayan D. Mukherjee - Albuquerque NM, US

Assignee:

Sandia Corporation - Albuquerque NM

International Classification:

B23B 27/00
B23C 9/00

US Classification:

29 27C, 29 26 A, 409131, 409165

Abstract:

Methods for manufacturing high precision arrays of curved features (e. g. lenses) in the surface of a workpiece are described utilizing orthogonal sets of inter-fitting locating grooves to mate a workpiece to a workpiece holder mounted to the spindle face of a rotating machine tool. The matching inter-fitting groove sets in the workpiece and the chuck allow precisely and non-kinematically indexing the workpiece to locations defined in two orthogonal directions perpendicular to the turning axis of the machine tool. At each location on the workpiece a curved feature can then be on-center machined to create arrays of curved features on the workpiece. The averaging effect of the corresponding sets of inter-fitting grooves provide for precise repeatability in determining, the relative locations of the centers of each of the curved features in an array of curved features.

US Patent:

20030169797, Sep 11, 2003

Filed:

Jun 19, 2002

Appl. No.:

10/175659

Inventors:

Rafael Aldaz - Mountain View CA, US
Gordon Keeler - Menlo Park CA, US
Vijit Sabnis - Menlo Park CA, US
James Harris - Stanford CA, US
David Miller - Stanford CA, US

International Classification:

H01S003/08

US Classification:

372/096000

Abstract:

A monolithically integrated, mode-locked vertical cavity surface emitting laser (VCSEL) for emitting ultrafast high power pulses. The resonator of the VCSEL has an active medium for emitting a radiation, a spacer for extending the resonator to a length L at which a significant number N of axial modes of the radiation are supported in the resonator and a saturable absorber for mode-locking. The VCSEL has an arrangement for stabilizing the resonator such that one transverse mode of the radiation is supported within the resonator. The VCSEL also has an arrangement for compensating dispersion of the radiation occurring in the resonator.