Yuri S Grapov

US Patent:

6763042, Jul 13, 2004

Filed:

Dec 14, 2001

Appl. No.:

10/017162

Inventors:

Forrest L. Williams - Sandy UT
Yuri S. Grapov - Sandy UT
Dennis F. Elkins - Draper UT
Allen H. Tanner - Sandy UT

Assignee:

Evans Sutherland Computer Corporation - Salt Lake City UT

International Classification:

H01S 330

US Classification:

372 6, 372 20, 372 21, 372 22, 372 29011, 372 28

Abstract:

A method and device for the nonlinear combination of laser light which produces a beam of uniform intensity, high spatial purity, and high conversion efficiency. The method includes emitting a laser light from a tunable distributed feedback fiber laser having both thermal and piezoelectric control elements which produces a laser light at a given frequency, wavelength, and intensity; converting the laser light in a nonlinear resonator which uses a nonlinear optical crystal for frequency conversion or mixing; and measuring the resonant frequency of the nonlinear resonator and adjusting the laser light frequency using both the thermal and piezoelectric elements of the fiber laser light source to match the resonant frequency conditions within the nonlinear resonator.

US Patent:

6868212, Mar 15, 2005

Filed:

Mar 6, 2003

Appl. No.:

10/383909

Inventors:

Jeannie DeWitte - Burke VA, US
Yuri Grapov - Park City UT, US
David Owen - West Jordan UT, US
Dennis Elkins - Draper UT, US
Aaron McAllister - Sandy UT, US
Allen Tanner - Sandy UT, US

Assignee:

Evans & Sutherland Computer Corporation - Salt Lake City UT

International Classification:

G02B006/02

US Classification:

385123, 385 13, 385 14, 372 6

Abstract:

A method for adjusting the wavelength and dominant mode of a laser fiber prior to installation in a laser assembly includes the steps of linearly stretching the laser fiber so as to modify its output wavelength, axially twisting the laser fiber so as to modify its dominant mode, and affixing the laser fiber to a laser assembly in its linearly stretched and axially twisted condition. The laser assembly includes a dynamic tuning mechanism for wavelength adjustment during use. The twisted and stretched fiber has an unadjusted wavelength and dominant mode that are within a selected range before adjustment by the dynamic tuning mechanism.

US Patent:

7526162, Apr 28, 2009

Filed:

Feb 27, 2008

Appl. No.:

12/072598

Inventors:

Yuri Grapov - Sutton MA, US
William D. Jones - Wrentham MA, US

Assignee:

IPG Photonics Corporation - Oxford MA

International Classification:

G02B 6/26

US Classification:

385 52, 385 60, 385 72, 385 77, 385 78, 385 81, 385 93

Abstract:

An epoxy-free collimator assembly is configured with a ferrule and a lens operative to move within an outer case to a desired position therebetween. The collimator assembly further has an aligning component made from soft, malleable material which is capable of filling out the radial space between the ferrule and case so as to spatially fix the aligned fiber held in the ferrule and lens in the desirable position.

US Patent:

7653116, Jan 26, 2010

Filed:

Feb 27, 2008

Appl. No.:

12/072596

Inventors:

Yuri Grapov - Sutton MA, US
William D. Jones - Wrentham MA, US
Rene J. Lyman - Sutton MA, US

Assignee:

IPG Photonics Corporation - Oxford MA

International Classification:

H01S 3/08

US Classification:

372107, 372108

Abstract:

A portable laser head has a single-piece holder configured with a plurality of spaced-apart nests. The nests are arranged to receive at least a non-linear frequency converter, a V-shaped beam splitter and a dump collimator. Alternatively, the holder has multiple nests configured to receive an input collimator and output focusing optics unit in addition to the non-linear frequency converter, V-shaped beam splitter and dump collimator. The holder is characterized by small dimensions allowing for self-alignment of the above-referred components.

US Patent:

7794159, Sep 14, 2010

Filed:

Mar 3, 2009

Appl. No.:

12/396536

Inventors:

Yuri Grapov - Sutton MA, US
William D. Jones - Oxford MA, US
Michael M. DiGiantommaso - Oxford MA, US

International Classification:

G02B 6/36
G02B 6/12
G02B 6/42
G02B 6/00
H01S 3/00
H01S 3/08

US Classification:

385 94, 385 14, 385 31, 385 32, 385 33, 385 34, 385 39, 385 47, 385 88, 385 92, 385 93, 385134, 385135, 385136, 385137, 385138, 385139, 385147, 372 6, 372 92, 372 98, 372108

Abstract:

A beam coupler assembly for a fiber laser is disclosed. The assembly includes a housing having a sidewall with an interior surface, an exterior surface, a first end and a second end. A first seal extending from the interior surface of the tubular housing and dividing the housing into a first section and a second section is also provided. The first section and second section are environmentally isolated from one another. However, the first seal is substantially optically neutral. An input collimator unit received within the first end of the sidewall of the housing and into the first section and is releasably coupled thereto. An output collimator unit received within the second end of the sidewall of the housing and into the second section and is also releasably coupled thereto.

US Patent:

7982935, Jul 19, 2011

Filed:

Dec 31, 2008

Appl. No.:

12/317997

Inventors:

Yuri Grapov - Sutton MA, US
William D. Jones - Wrentham MA, US
Michael Digiantommaso - Oxford MA, US

International Classification:

G02B 26/08

US Classification:

3592121

Abstract:

A mirror positioning assembly for use in beam switching is provided that employs a novel arrangement of the mirrors and the motors to selectively position the mirrors. The assembly is installed into the housing of an assembly for distributing laser energy where the mirrors are contained within the beam cavity and the remainder of the assembly is outside of the housing. The assembly is received in a port within the housing in a manner that allows 360 of rotational adjustment so that the mirror can be carefully aligned to insure near lossless distribution of the beam energy as it passes through the device. This arrangement keeps the electronics, motors, bearings and adjustments of the mirror switching external to the beam cavity herby reducing the number of potential contaminants contained therein.

US Patent:

8014641, Sep 6, 2011

Filed:

Dec 31, 2008

Appl. No.:

12/319070

Inventors:

Yuri Grapov - Sutton MA, US
William D. Jones - Wrentham MA, US
Vladlen Ivshin - Dudley MA, US

International Classification:

G02B 6/32

US Classification:

385 33, 385 62, 385 74, 385 81, 385 93

Abstract:

A coupler assembly for a fiber laser is disclosed. The assembly includes a tubular housing having a sidewall with an interior surface, an exterior surface, a first end and a second end. An input collimator unit is also included and configured to be received within the first end of the sidewall of the tubular housing. An output collimator unit received within the second end of the sidewall of the tubular housing. Further included is a compression mechanism configured and arranged to concentrically align the input collimator unit and the output collimator unit about a common central axis. The assembly may further include an alignment mechanism configured and arranged to optically align the input collimator unit and the output collimator unit about a common optical axis. Optionally, a fluid coolant system may also be included.

US Patent:

8111451, Feb 7, 2012

Filed:

Aug 3, 2009

Appl. No.:

12/534642

Inventors:

Dmitry Starodubov - Dudley MA, US
Yuri Grapov - Sutton MA, US
Ning Liu - Charlton MA, US

International Classification:

G02F 1/35

US Classification:

359326, 372 22, 359328

Abstract:

A method and system for converting one frequency into another include a MOPA configuration radiating a light at a first frequency which is coupled into a frequency conversion unit. Further included are a control unit operative to monitor the other frequency and a pump unit operative to vary its output power provided that the monitored frequency does not substantially match a reference value stored in the control unit. The output power of the pump unit varies while the master oscillator scans its cavity in search for the desired resonant frequency.