Roger L Farrow

US Patent:

6963062, Nov 8, 2005

Filed:

Apr 7, 2003

Appl. No.:

10/410314

Inventors:

Douglas R. Cyr - Livermore CA, US
Roger L. Farrow - Pleasanton CA, US

Assignee:

Eksigent Technologies, LLC - Livermore CA

International Classification:

G02B006/42

US Classification:

25022725, 25022728

Abstract:

A method for multiplexed optical detection includes: imaging light onto an input face of a first optical fiber, wherein the first optical fiber is a multimode optical fiber; inducing coupling among the propagation modes of the light in the first optical fiber; coupling an output face of the first optical fiber to input faces of multiple individual second optical fibers in a multi-fiber bundle, wherein each output face of the individual fibers emits substantially similar light; and detecting one or more properties of one or more fluids, including analytes that may be present, with the light emitted from at least one of the second optical fibers. The second optical fibers can be a part of an optical detector that is part of a high performance liquid chromatography system, which can be located in a substrate.

US Patent:

7050660, May 23, 2006

Filed:

Apr 7, 2003

Appl. No.:

10/410313

Inventors:

Douglas R. Cyr - Livermore CA, US
Roger L. Farrow - Pleasanton CA, US
Don W. Arnold - Livermore CA, US

Assignee:

Eksigent Technologies LLC - Dublin CA

International Classification:

G02B 6/00

US Classification:

385 12, 356248

Abstract:

A microfluidic detection device provides reduced dispersion of axial concentration gradients in a flowing sample. The microfluidic detection device includes a cell body and a flow path through the cell body. The flow path has an inlet segment, an outlet segment, and a central segment, which forms a detection cell. The central segment is located between and at an angle with both the inlet segment and the outlet segment. The central segment has a first junction with the inlet segment and a second junction with the outlet segment. The cell body contains two arms that can transmit light to and from the detection cell. At least a portion of a first arm is located in the first junction and at least a portion of a second arm is located in the second junction. The portions of the arms located in the junctions are situated so that fluid entering or exiting the central segment of the flow path flows around the outer surface of one of the portions. By ensuring that the flow velocity is high near the walls both at the beginning and at the end of the conduit, the configuration serves to counteract dispersion caused by the normal parabolic velocity profile of flow through a cylindrical conduit, where the fluid velocity is highest at the center.

US Patent:

7336860, Feb 26, 2008

Filed:

Apr 19, 2006

Appl. No.:

11/379348

Inventors:

Douglas R. Cyr - Livermore CA, US
Roger L. Farrow - Pleasanton CA, US
Don W. Arnold - Livermore CA, US

Assignee:

Eksigent Technologies, LLC - Dublin CA

International Classification:

G02B 6/00

US Classification:

385 12

Abstract:

A microfluidic detection device provides reduced dispersion of axial concentration gradients in a flowing sample. The microfluidic detection device includes a cell body and a flow path through the cell body. The flow path has an inlet segment, an outlet segment, and a central segment, which forms a detection cell. The central segment is located between and at an angle with both the inlet segment and the outlet segment. The central segment has a first junction with the inlet segment and a second junction with the outlet segment. The cell body contains two arms that can transmit light to and from the detection cell. At least a portion of a first arm is located in the first junction and at least a portion of a second arm is located in the second junction. The portions of the arms located in the junctions are situated so that fluid entering or exiting the central segment of the flow path flows around the outer surface of one of the portions. By ensuring that the flow velocity is high near the walls both at the beginning and at the end of the conduit, the configuration serves to counteract dispersion caused by the normal parabolic velocity profile of flow through a cylindrical conduit, where the fluid velocity is highest at the center.

US Patent:

7880961, Feb 1, 2011

Filed:

May 4, 2007

Appl. No.:

11/800383

Inventors:

Jean-Philippe Feve - Cupertino CA, US
Dahv A. V. Kliner - San Ramon CA, US
Roger L. Farrow - Pleasanton CA, US

Assignee:

Sandia Corporation - Livermore CA

International Classification:

H01S 3/00

US Classification:

3593411, 385123

Abstract:

An optical amplifier, such as an optical waveguide amplifier (e. g. , an optical fiber amplifier or a planar waveguide) or a non-guiding optical amplifier, that exhibits a net phase-mismatch selected to at least partially reduce gain-induced phase-matching during operation thereof is disclosed. In one aspect of the invention, an optical amplifier structure includes at least one optical amplifier having a length and a gain region. The at least one optical amplifier exhibits a net phase-mismatch that varies along at least part of the length thereof selected to at least partially reduce gain-induced phase-matching during operation thereof.

US Patent:

7925125, Apr 12, 2011

Filed:

Feb 12, 2008

Appl. No.:

12/030078

Inventors:

Douglas R. Cyr - Livermore CA, US
Roger L. Farrow - Pleasanton CA, US
Don W. Arnold - Livermore CA, US

Assignee:

DH Technologies Development Pte. Ltd. - Singapore

International Classification:

G02B 6/00

US Classification:

385 12, 216 2, 216 41

Abstract:

A microfluidic detection device provides reduced dispersion of axial concentration gradients in a flowing sample. The microfluidic detection device includes a cell body and a flow path through the cell body. The flow path has an inlet segment, an outlet segment, and a central segment, which forms a detection cell. The central segment is located between and at an angle with both the inlet segment and the outlet segment. The central segment has a first junction with the inlet segment and a second junction with the outlet segment. The cell body contains two arms that can transmit light to and from the detection cell. At least a portion of a first arm is located in the first junction and at least a portion of a second arm is located in the second junction. The portions of the arms located in the junctions are situated so that fluid entering or exiting the central segment of the flow path flows around the outer surface of one of the portions. By ensuring that the flow velocity is high near the walls both at the beginning and at the end of the conduit, the configuration serves to counteract dispersion caused by the normal parabolic velocity profile of flow through a cylindrical conduit, where the fluid velocity is highest at the center.

US Patent:

20220404648, Dec 22, 2022

Filed:

Jun 30, 2022

Appl. No.:

17/854933

Inventors:

- Camas WA, US
Brian VICTOR - Camas WA, US
Robert J. MARTINSEN - Portland OR, US
Dahv A.V. KLINER - Portland OR, US
Roger FARROW - Vancouver WA, US

Assignee:

NLIGHT, INC. - Camas WA

International Classification:

G02F 1/01
B23K 26/067
B23K 26/38
G02B 6/14
B23K 26/21
B22F 3/11
B22F 3/24
B23K 26/03
G02B 6/02
B33Y 10/00
B33Y 30/00
B33Y 50/02
B23K 26/342
B29C 48/08
G02B 6/036
G02B 6/42
B23K 26/062
B23K 26/70
B29C 64/264
B29C 64/153
H01S 5/00
B22F 12/00
B23K 26/064
B23K 26/073
G02B 6/255
G02B 27/09

Abstract:

A method of processing by controlling one or more beam characteristics of an optical beam may include: launching the optical beam into a first length of fiber having a first refractive-index profile (RIP); coupling the optical beam from the first length of fiber into a second length of fiber having a second RIP and one or more confinement regions; modifying the one or more beam characteristics of the optical beam in the first length of fiber, in the second length of fiber, or in the first and second lengths of fiber; confining the modified one or more beam characteristics of the optical beam within the one or more confinement regions of the second length of fiber; and/or generating an output beam, having the modified one or more beam characteristics of the optical beam, from the second length of fiber. The first RIP may differ from the second RIP.

US Patent:

20230036091, Feb 2, 2023

Filed:

Jan 28, 2021

Appl. No.:

17/788677

Inventors:

- Camas WA, US
Teemu KOKKI - Camas WA, US
Roger FARROW - Camas WA, US
Dahv A.V. KLINER - Camas WA, US

Assignee:

NLIGHT, INC. - Camas WA

International Classification:

H01S 3/00
H01S 3/067

Abstract:

Some embodiments may include a fiber laser including two or more input fibers and an output fiber to deliver a beam to a workpiece, the fiber laser comprising. The fiber laser may include a combiner having ends and a length, wherein the combiner is arranged to release, from its length, a portion of back-reflected light received from the output fiber at an output end of the ends from the combiner, the combiner including: a capillary tube to enclose part of the two or more input fibers at an input end of the ends of the combiner, the capillary tube having ends and a length located between the ends of the capillary tube; and a cladding light stripper (CLS) defined by part of the length of the capillary tube, wherein the CLS provides the release of the portion of the back-reflected light. Other embodiments may be disclosed and/or claimed.

US Patent:

20210344160, Nov 4, 2021

Filed:

Jan 19, 2021

Appl. No.:

17/152670

Inventors:

- Vancouver WA, US
Roger L. Farrow - Vancouver WA, US

Assignee:

NLIGHT, INC. - Vancouver WA

International Classification:

H01S 3/067
H01S 3/08
H01S 3/094

Abstract:

An optical apparatus includes one or more pump sources situated to provide laser pump light, and a gain fiber optically coupled to the one or more pump sources, the gain fiber including an actively doped core situated to produce an output beam, an inner cladding and outer cladding surrounding the doped core and situated to propagate pump light, and a polymer cladding surrounding the outer cladding and situated to guide a selected portion of the pump light coupled into the inner and outer claddings of the gain fiber. Methods of pumping a fiber sources include generating pump light from one or more pump sources, coupling the pump light into a glass inner cladding and a glass outer cladding of a gain fiber of the fiber source such that a portion of the pump light is guided by a polymer cladding surrounding the glass outer cladding, and generating a single-mode output beam from the gain fiber.