Mark S Sobey

US Patent:

20100147811, Jun 17, 2010

Filed:

Jan 5, 2009

Appl. No.:

12/348727

Inventors:

Mark S. Sobey - San Carlos CA, US

International Classification:

B23K 26/067
B23K 26/08
B23K 26/36

US Classification:

21912169, 21912168, 21912176

Abstract:

A groove pattern is scribed into a silicon-nitride layer on a silicon wafer using four independently scanned, focused beams of laser radiation. Each focused beam is scannable within one of four scan-field positions on a turntable. The wafer is transported incrementally from the first scan-field position to the second, third and fourth scan-field positions. The scanned focused laser beam in each scan-field position scribes a portion of the groove pattern on the wafer, with scribing of the groove pattern being completed at the fourth scan-field position.

US Patent:

54577071, Oct 10, 1995

Filed:

Aug 24, 1993

Appl. No.:

8/111083

Inventors:

Mark S. Sobey - San Carlos CA
James B. Clark - Campbell CA
Vincent J. Newell - Pleasanton CA

Assignee:

Spectra-Physics Lasers, Inc. - Mountain View CA

International Classification:

H03F 700
H01S 323
H01S 3082
H01S 310

US Classification:

372 20

Abstract:

A tunable laser system having a wide tunable range, and narrow line widths, achieves relatively high output powers. The tunable laser system includes a master optical parametric oscillator which generates a seed beam, and a power optical parametric oscillator which is responsive to the seed beam to generate a narrow line width, high power output beam. The master OPO and power OPO comprise gain media consisting of BBO, tunable over a range from about 400 nanometers to more than 2000 nanometers. The master OPO includes line narrowing elements, such as a tunable grating, which limits the line width of the output beam to less than one wave number (centimeter. sup. -1). Pump energy is supplied to the master OPO and power OPO using a Nd:YAG laser with a harmonic generator, so that the second, third, or fourth harmonics of the primary 1064 nanometer line of YAG can be used to pump the BBO crystals. The power OPO may be an unstable resonator.

US Patent:

52727130, Dec 21, 1993

Filed:

Aug 27, 1992

Appl. No.:

7/937358

Inventors:

Mark S. Sobey - San Carlos CA
Bertram C. Johnson - Sunnyvale CA
Glen R. Blevins - San Jose CA

Assignee:

Spectra-Physics Lasers, Inc. - Mountain View CA

International Classification:

H01S 309

US Classification:

372 69

Abstract:

A pulsed laser system capable of operating at higher repetition rates, while maintaining the efficiency and beam quality of the output pulses comprises first and second gain media with one or more pump energy transducers, such as flashlamps, coupled with each of the gain media. A power supply generates a first sequence of pulses of input power and a second sequence of pulses of input power which drive respective subsets of the pump energy transducers in an independent timing relationship. Thus, two non-aligned 50 Hz sequences of input pulses which are interleaved generate an output pulse stream at 100 Hz from the laser system with the efficiency, beam quality, and average power comparable to that of a 50 Hz laser. By pumping subsets of the pump energy transducers coupled to a laser system in an interleaved fashion, higher repetition rates may be achieved with better output beam quality and higher average power than has been obtainable with prior art systems. The non-aligned timing also allows for variable pulse timing offsets.