Emily J Cheng

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.

US Patent:

59075708, May 25, 1999

Filed:

Oct 22, 1997

Appl. No.:

8/955768

Inventors:

William L. Nighan - Menlo Park CA
Mark S. Keirstead - San Jose CA
Emily Cheng - Sunnyvale CA

Assignee:

Spectra-Physics, Inc. - Mountain View CA

International Classification:

H01S 316

US Classification:

372 41

Abstract:

A diode pumped laser includes a resonator mirror and an output coupler, defining a laser resonator with a resonator optical axis. A strong thermal lens gain medium with a TEM. sub. 00 mode diameter is mounted in the resonator along the resonator optical axis. The dopant level of the gain medium is in the range of 0. 01 to less than 0. 5 percent. A diode pump source supplies a pump beam to the gain medium in the laser resonator, and produces an output beam with a diameter larger than the TEM. sub. 00 mode diameter to reduce thermal birefringence. A power source supplies power to the diode pump source. A polarizing element can be positioned in the resonator, along with a aperture stop The laser operates well over a large range of pump powers. Its slope efficiency in the TEM. sub. 00 mode is greater than 40%, with an overall efficiency greater than 25%.

US Patent:

6185235, Feb 6, 2001

Filed:

Nov 24, 1998

Appl. No.:

9/199031

Inventors:

Emily Cheng - Sunnyvale CA
Dave R. Dudley - El Granada CA
William L. Nighan - Menlo Park 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

Abstract:

A high power, diode pumped laser has a Nd:YVO. sub. 4 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.

US Patent:

58355138, Nov 10, 1998

Filed:

Jan 8, 1997

Appl. No.:

8/780495

Inventors:

Jan-Willem Pieterse - San Jose CA
Alan B. Petersen - Palo Alto CA
Chris Pohalski - Mountain View CA
Emily Cheng - Sunnyvale CA
Randall Lane - Menlo Park CA
William L. Nighan - Menlo Park CA

Assignee:

Spectra Physics, Inc. - Mt. View CA

International Classification:

H01S 310

US Classification:

372 22

Abstract:

A diode pumped laser includes a high reflector and an output coupler defining a resonator. The resonator includes a gain medium and a Q-switch and produces a fundamental beam. A first non-linear crystal is positioned extra-cavity of the resonator along a path of the fundamental beam. The first non-linear crystal generates a second harmonic beam from the fundamental beam. The first non-linear crystal is critically phased matched. A second non-linear crystal is portioned extra-cavity of the resonator along a path of the fundamental beam and the path of the second harmonic beam. The second non-linear crystal produces a third harmonic beam. The second non-linear crystal is critically phased matched.

US Patent:

62872982, Sep 11, 2001

Filed:

Apr 30, 1998

Appl. No.:

9/070478

Inventors:

William L. Nighan - Menlo Park CA
John Cole - Sunnyvale CA
Emily Cheng - Sunnyvale CA

Assignee:

Spectra-Physics Lasers, Inc. - Mountain View CA

International Classification:

A61F 9008

US Classification:

606 10

Abstract:

A diode pumped, multi axial mode, intracavity doubled laser has at least two resonator mirrors that define a resonator cavity. A Nd:YVO. sub. 4 laser crystal and a LBO doubling crystal are positioned in the resonator cavity. A diode pump source supplies a pump beam to the laser crystal and produces a laser crystal beam with at least three axial modes that are incident on the doubling crystal. A frequency doubled output beam is generated with an output power of at least 1 watt.