Jean-Marc Heritier

US Patent:

20070286247, Dec 13, 2007

Filed:

May 24, 2007

Appl. No.:

11/805632

Inventors:

H. Yang Pang - San Jose CA, US
David Dudley - Montara CA, US
Jean-Marc Heritier - Sunnyvale CA, US
Norman Hodgson - Belmont CA, US

International Classification:

H01S 3/11
H01S 3/10
H01S 3/081
H01S 3/082

US Classification:

372 10, 372 22, 372 93, 372 97

Abstract:

An intracavity frequency-doubled includes a laser resonator including at least one gain element and two optically nonlinear crystals. The two optically nonlinear crystals independently double the frequency of fundamental radiation in the resonator. In one example the crystals are arranged to generate two frequency-doubled beams that are orthogonally plane-polarized with respect to each other. The beams can be combined by a polarization-selective combiner to form a common output.

US Patent:

20090257118, Oct 15, 2009

Filed:

Apr 15, 2008

Appl. No.:

12/103097

Inventors:

JEAN-MARC HERITIER - Sunnyvale CA, US
Rimas Viselga - Sunnyvale CA, US

International Classification:

G02B 23/00

US Classification:

359399, 359366

Abstract:

A beam shaping telescope includes two mirrors having rotationally symmetric curvature inclined to the optical axis of the telescope. By selecting an appropriate curvature, spacing, and inclination of the mirrors, the telescope can be used to transform an astigmatic laser beam having a non-circular cross section into a circular beam having essentially zero astigmatism.

US Patent:

61153974, Sep 5, 2000

Filed:

Apr 21, 1999

Appl. No.:

9/295686

Inventors:

Jean-Marc Heritier - San Jose CA
Francois Moya - Los Altos CA

Assignee:

Hoya Photonics, Inc. - Santa Clara CA

International Classification:

H01S 300

US Classification:

372 33

Abstract:

In a laser system which produces radiation which is highly absorbed by water, the pump voltage supplied to the laser rod is slowly increased between the lasing threshold voltage and the full operational voltage of the pump. As a result, the output energy and circulating energy of the system slowly increase, such that any water on the intracavity coatings is vaporized slowly, rather than explosively. The laser system and method of using same thus reduce or prevent damage to the intracavity coatings used within the laser cavity.

US Patent:

54126738, May 2, 1995

Filed:

Dec 22, 1993

Appl. No.:

8/172086

Inventors:

Andrea L. Caprara - Mountain View CA
Jean-Marc Heritier - San Jose CA

Assignee:

Hoya Corporation - Tokyo

International Classification:

H01S 3098

US Classification:

372 19

Abstract:

The use of feedback circuit in a laser device with a frequency selective element such as an etalon allows for the production of a substantially single longitudinal mode output indefinitely. The feedback circuitry is adapted to adjust the length of the laser cavity so that a longitudinal mode of the laser device is near transmission peak of the frequency selective element.

US Patent:

49187040, Apr 17, 1990

Filed:

Jan 10, 1989

Appl. No.:

7/295649

Inventors:

Andrea L. Caprara - San Jose CA
Jean-Marc Heritier - San Jose CA

Assignee:

Quantel International, Inc. - Santa Clara CA

International Classification:

H01S 308

US Classification:

372 99

Abstract:

A Q-switched pulsed laser resonant cavity having an output coupling mirror with a radially variable reflectivity function across its surface and a magnification level that combine to provide a very high discrimination against transverse modes of oscillation higher than a desired fundamental mode. This resonant cavity is especially adapted for use with injection seeding to limit the longitudinal modes of oscillation to one mode. The cavity arrangement develops a high powered light pulsed beam at its output that also has a uniform intensity profile.

US Patent:

54558387, Oct 3, 1995

Filed:

Nov 15, 1993

Appl. No.:

8/152471

Inventors:

Jean-Marc Heritier - San Jose CA
Edward C. Rea - Palo Alto CA

Assignee:

Hoya Corporation - Tokyo

International Classification:

H01S 3094

US Classification:

372 75

Abstract:

The use of rectangular cross-section gain material with two or more cylindrical lenses placed in close proximity or attached to opposite sides of the gain material allows for an efficient pumping of the gain material in an optical gain component. The optical gain component can be used in a laser device. Laser diode bars are arranged so as to pump the gain material through the lenses. A cooling apparatus can cool a rectangular cross-section gain material through two opposite flat sides so that no thermal birefringence is created. An optical gain component with two gain materials can orient these two gain materials such that the small-signal gain is almost circular and gaussian in profile with a large center peak tapering off to a much lower gain at the edges.