James L Kafka

age ~59

from South Lake Tahoe, CA

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Method And Apparatus To Detect A Flaw In A Surface Of An Article
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US Patent:

6373565, Apr 16, 2002
Filed:

May 27, 1999
Appl. No.:

09/321499
Inventors:

James D. Kafka - Mountain View CA
Bruce Craig - Los Gatos CA
Assignee:

Spectra Physics Lasers, Inc. - Mountain View CA
International Classification:

G01N 2100
US Classification:

3562374, 3562371, 3562373, 3562375, 372 39, 372 67, 372 75
Abstract:

An inspection apparatus includes a laser system. The laser system has a high reflector and an output coupler that define an oscillator cavity which produces an output beam. A gain medium and a mode locking device are positioned in the oscillator cavity. A diode pump source produces a pump beam that is incident on the gain medium. An output beam directing apparatus directs the output beam to the surface of the article. A surface flaw at the surface of the article produces scattered light from at least a portion of the output beam incident on the surface flaw. A detector is positioned to detect the scattered light.

Photonic Crystal Fiber System For Sub-Picosecond Pulses
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US Patent:

6389198, May 14, 2002
Filed:

May 11, 2001
Appl. No.:

09/854154
Inventors:

James D. Kafka - Mountain View CA
David E. Spence - Sunnyvale CA
Assignee:

Spectra Physics Lasers, Inc. - Mountain View CA
International Classification:

G02B 626
US Classification:

385 31
Abstract:

Fiber delivery systems are desirable to provide convenient delivery of an output beam from a laser system to a target distanced from the source. For ultra-short pulse lasers, a limiting factor in fiber delivery is the dispersion of the optical fiber. A fiber delivery system for ultra-short pulses that uses a photonic crystal fiber to Fprovide the appropriate dispersion is described.

Stack Pumped Vanadate Amplifier
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US Patent:

6417955, Jul 9, 2002
Filed:

Dec 14, 1999
Appl. No.:

09/461517
Inventors:

James D. Kafka - Mountain View CA
James B. Clark - Campbell CA
Jason D. Henrie - Los Altos CA
Assignee:

Spectra Physics Lasers, Inc. - Mountian View CA
International Classification:

H01S 3098
US Classification:

359333
Abstract:

An amplifier uses a two-dimensional array of cw diodes to produce a pump beam. A coupler is positioned to receive the pump beam. The coupler reduces a cross-sectional dimension of the pump beam and creates a modified pump beam. A vanadate gain medium is positioned adjacent to the coupler. The vanadate gain medium absorbs at least a portion of the modified pump beam and is positioned to receive an input beam from an input beam source and produce an amplified output beam.

Quasi-Continuous Wave Lithography Apparatus And Method
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US Patent:

6421573, Jul 16, 2002
Filed:

May 27, 1999
Appl. No.:

09/322121
Inventors:

James D. Kafka - Mountain View CA
Bruce Craig - Los Gatos CA
Assignee:

Spectra Physics Lasers, Inc. - Mountain View CA
International Classification:

G06F 1900
US Classification:

700121
Abstract:

A lithography system for providing interconnections of integrated circuits on a substrate includes a laser system with a high reflector and an output coupler that define an oscillator cavity. A gain medium and a mode locking device are positioned in the oscillator cavity. A diode pump source produces a pump beam that is incident on the gain medium. A processor is coupled to the laser system and stores a representation of interconnections for the integrated circuit. An output beam directing apparatus is coupled to the processor and directs the output beam to the substrate and form the interconnections.

Lasers With Low Doped Gain Medium
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US Patent:

6504858, Jan 7, 2003
Filed:

Dec 20, 2000
Appl. No.:

09/745378
Inventors:

Emily Cheng - Sunnyvale CA
Dave R Dudley - El Granada CA
James D. Kafka - Mountain View CA
David E. Spence - Sunnyvale CA
David S. Bell - San Jose CA
Assignee:

Spectra Physics Lasers, Inc. - Mountain View CA
International Classification:

H01S 314
US Classification:

372 39, 372 75, 372 69
Abstract:

A high power, diode pumped laser has a Nd:YVO gain media. Scaling to higher powers is achieved with the use of a low doped gain media, increasing the length of the gain media as well as increasing the pump volume. Passive cooling is extended to output powers of 10 W or greater.

Method And Apparatus For Micro-Machining Of Articles That Include Polymeric Materials
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US Patent:

6734387, May 11, 2004
Filed:

Apr 1, 2002
Appl. No.:

10/114337
Inventors:

James D. Kafka - Palo Alto CA
Mingwei Li - Sunnyvale CA
Assignee:

Spectra Physics Lasers, Inc. - Mountain View CA
International Classification:

B23K 2638
US Classification:

21912168, 21912169, 264400
Abstract:

A micro-machining apparatus includes a mode-locked, infrared laser system with a high reflector and an output coupler that define an oscillator cavity which produces an output beam. A gain medium and a mode locking device are positioned in the oscillator cavity. A diode pump source produces a pump beam that is incident on the gain medium. A second harmonic generator is coupled to the oscillator cavity. A third harmonic generator is coupled to the second harmonic generator and produces a UV output beam. An output beam directing apparatus directs the output beam to a polymeric surface of an article. At least a portion of the polymeric material is micro-machined by the output beam.

Remote Uv Laser System And Methods Of Use
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US Patent:

6822978, Nov 23, 2004
Filed:

Jul 12, 2002
Appl. No.:

10/194439
Inventors:

James D. Kafka - Palo Alto CA
David E. Spence - Mountain View CA
Assignee:

Spectra Physics, Inc. - Mountain View CA
International Classification:

H01S 3098
US Classification:

372 18, 372 19, 372 21, 372 22, 372108, 385 31, 359326
Abstract:

A laser apparatus includes a modelocked laser system with a high reflector and an output coupler that define an oscillator cavity. An output beam is produced from the oscillator cavity. A gain medium and a modelocking device are positioned in the oscillator cavity. A diode pump source produces a pump beam that is incident on the gain medium. A second harmonic generator is coupled to the oscillator cavity. A third harmonic generator that produces a UV output beam, is coupled to the second harmonic generator. A photonic crystal fiber is provided with a proximal end coupled to the laser system. A delivery device is coupled to a distal portion of the photonic crystal fiber.

Method And Apparatus For Polarization And Wavelength Insensitive Pumping Of Solid State Lasers
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US Patent:

6891876, May 10, 2005
Filed:

Aug 30, 2002
Appl. No.:

10/233138
Inventors:

Dirk Sutter - Mountain View CA, US
James D. Kafka - Palo Alto CA, US
Assignee:

Spectra Physics, Inc. - Mountain View CA
International Classification:

H01S003/091
US Classification:

372 70, 372 69, 372 71
Abstract:

An optical system has a diode pump source, and a gain media made of a material with an anisotropic absorption. The gain media is cut at an angle to produce substantially polarization-independent absorption of a pump beam. An optical coupler is positioned between the diode pump source and the gain media. The optical coupler produces a pump beam that has substantially equal amounts of pump power along any two orthogonal axis that are orthogonal to the pump beam in the gain medium. The wavelength range allowed for the pump source is extended.