Hans W Bruesselbach

US Patent:

6346686, Feb 12, 2002

Filed:

Oct 20, 1999

Appl. No.:

09/421032

Inventors:

Alexander A. Betin - Calabasas CA
Hans W. Bruesselbach - Calabasas CA
Metin S. Mangir - Santa Monica CA

Assignee:

Hughes Electronics Corporation - El Segundo CA

International Classification:

B23K 2638

US Classification:

21912161, 2191217

Abstract:

A laser comprising a master oscillator and a loop phase conjugate mirror (Loop-PCM) for substantially eliminating transient relaxation oscillations to instead form controlled sustained pulsations. In a preferred embodiment suitable for material processing applications with high power requirements, the master oscillator is part of a Phase Conjugate Master Oscillator Power Amplifier (PC-MOPA). A method for processing a material using a Loop-PCM by determining and using an optimal pulse fluence, duration and spacing is provided. Using pulses of the kind which are produced by the transient, and normally not desirable, relaxation oscillations common to Nd:YAG and other lasers, relaxation oscillations with controllable pulse duration, repetition rate and duty cycle are generated, making it ideal for materials processing.

US Patent:

6646793, Nov 11, 2003

Filed:

Dec 14, 2000

Appl. No.:

09/736997

Inventors:

Hans W. Bruesselbach - Calabasas CA
Alexander A. Betin - Manhattan Beach CA
David S. Sumida - Los Angeles CA

Assignee:

Raytheon Company - Lexington MA
Hughes Electronics Corporation - El Segundo CA

International Classification:

H01S 300

US Classification:

359342, 372 41

Abstract:

A high gain optical amplifier and method. Generally, the inventive amplifier includes a first crystal having an axis and a first index of refraction and a second crystal bonded to the first crystal about the axis and having a second index of refraction. The first index is higher than the second index such that light through the first crystal is totally internally reflected. In the illustrative embodiment, the first crystal is Yb:YAG with an index of approximately 1. 82, the second crystal is Sapphire with an index of approximately 1. 78, and the axis is the propagation axis. The invention is, in its preferred embodiment, a light guide fabricated out of crystalline materials, diffusion bonded together. If the core of the light guide is doped with laser ions, high gain amplifiers made be designed and operable over a large Ãtendue. With a judicious choice of the laser crystal and cladding materials, shape, and bonding technique, the guided amplifier is much less susceptible to parasitic oscillation than amplifiers constructed in accordance with conventional teachings.

US Patent:

6845111, Jan 18, 2005

Filed:

Mar 6, 2003

Appl. No.:

10/383384

Inventors:

David S. Sumida - Los Angeles CA, US
Hans W. Bruesselbach - Monte Nido CA, US

Assignee:

HRL Laboratories, LLC - Malibu CA

International Classification:

H01S 300

US Classification:

372 36

Abstract:

A laser apparatus, comprising a layer fabricated of a lasing medium, the layer having a top surface and a bottom surface, and a first substrate layer fabricated of a laser-inactive material, the first substrate being diffusion-bonded to the layer of lasing medium, wherein the lasing medium comprises a crystalline, polycrystalline or glass material doped with ions. The lasing medium selected for fabrication of the laser apparatus of this invention comprises neodymium-doped yttrium vanadate material and laser-inactive material of the substrate comprises an yttrium-aluminate or yttrium vanadate material. The layers of material are oriented so that the thermal expansion coefficients along the crystallographic axes of the materials match or nearly match.

US Patent:

6895152, May 17, 2005

Filed:

Jun 28, 2001

Appl. No.:

09/894347

Inventors:

David S. Sumida - Los Angeles CA, US
Hans W. Bruesselbach - Monte Nido CA, US
Alexander A. Betin - Manhattan Beach CA, US

Assignee:

HRL Laboratories, LLC - Malibu CA

International Classification:

G02B006/16

US Classification:

385123, 385126, 385142, 372 6, 372 40

Abstract:

A solid state waveguided structure a core fabricated of a lasing medium, diffusion-bonded to a cladding fabricated of a laser-inactive material. The medium of the core comprises a lutetium-aluminum-garnet material doped with ions of ytterbium, lutetium-aluminum-garnet material doped with ions of neodymium, and lutetium-aluminum-garnet material doped with ions of thulium, and the laser-inactive material of the cladding comprises an yttrium-aluminum-garnet material. A method of fabricating a solid state waveguided structure with improved characteristics comprising using a combination of a trivalent ions of ytterbium-doped lutetium-aluminum-garnet core and a yttrium-aluminum-garnet cladding.

US Patent:

6987789, Jan 17, 2006

Filed:

Mar 6, 2003

Appl. No.:

10/383376

Inventors:

Hans W. Bruesselbach - Monte Nido CA, US
David S. Sumida - Los Angeles CA, US

Assignee:

HRL Laboratories, LLC - Malibu CA

International Classification:

H01S 3/091

US Classification:

372 70, 372 67, 372 72

Abstract:

A laser system for producing a laser beam, the laser system having top and bottom heat-sinking bars forming the structure of the laser system and plurality of disks comprising a laser material mounted on both the bottom heat-sinking bar and the top heat-sinking bar. Also mounted on both heat-sinking bars is a plurality of pump diode bars. Each pump diode bar is preferably mounted opposite a corresponding laser disk on the opposite heat-sinking bar. The pump diode bars and the disks are symmetrically mounted on the top and bottom heat-sinking bars, so that each heat-sinking bar has an alternating pattern of pump diode bars and laser disks. The laser system is configured such that the lasing beams impinge on the disks with an incidence angle far off normal.

US Patent:

7217585, May 15, 2007

Filed:

Mar 31, 2006

Appl. No.:

11/395702

Inventors:

David S. Sumida - Los Angeles CA, US
Authi A. Narayanan - Thousand Oaks CA, US
Hans W. Bruesselbach - Calabasas CA, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

H01L 21/20

US Classification:

438 31, 438455

Abstract:

A waveguide is fabricated by first preparing two waveguide precursor pieces. Each waveguide precursor piece includes a single-crystal substrate, and an epitaxial coating layer of an oxide coating material on the substrate. The oxide substrate material preferably comprises yttrium as a substrate-material cation, and the oxide coating material preferably comprises a coating-material cation selected from the group consisting of ytterbium, thulium, erbium, and holmium. The two substrates are placed together with the coating layers in contact to form a precursor structure. The precursor structure is heated to an elevated diffusion temperature so that the coating layers bond together and the coating materials and the respective substrate materials interdiffuse to form the waveguide having an interdiffused region. A laser beam may be directed through the interdiffused region, while the interdiffused region is optionally optically pumped through one or both of the substrates.

US Patent:

7233726, Jun 19, 2007

Filed:

Sep 19, 2005

Appl. No.:

11/231261

Inventors:

David M. Pepper - Malibu CA, US
Hans W. Bruesselbach - Monte Nido CA, US
Monica Minden - Monte Nido CA, US

Assignee:

HRL Laboratories, LLC - Malibu CA

International Classification:

G02B 6/02

US Classification:

385125

Abstract:

A phase-conjugate mirror has a length of hollow core photonic crystal multi-spatial mode, polarization-maintaining fiber disposed in a vessel, with a compressible and preferably gaseous medium, such as Xe or CH4, occupying the hollow core of the of hollow core photonic crystal fiber and surrounding the exterior of the hollow core photonic crystal fiber. At least one sealed window is provided in the vessel, the at least one sealed window being optically coupled to at least one end of the length of hollow core photonic crystal fiber.

US Patent:

7274717, Sep 25, 2007

Filed:

Jul 15, 2004

Appl. No.:

10/893106

Inventors:

Monica Minden - Monte Nido CA, US
Hans W. Bruesselbach - Monte Nido CA, US
Shuoqin Wang - Westlake Village CA, US
Eric Mies - Matawan NJ, US

Assignee:

HRL Laboratories, LLC - Malibu CA

International Classification:

H01S 3/30
G02B 6/26

US Classification:

372 6, 385 43

Abstract:

A multiple-fiber, stretched, fused and cleaved coupler designed to act as an output window to a fiber laser array or fiber-coupled laser array, in which the stretch, length and/or position of the fibers is chosen facilitate the in-phase oscillation of the lasers in the array. The in-phase oscillation of the lasers is facilitated by making one or more of the fibers interferometrically dark and having a different propagation constant than the other fibers. The other fibers, the interferometrically lit ones, are made to have fairly uniform intensity under the same collimated illumination.