Eduard Joseph Gregor

US Patent:

50991477, Mar 24, 1992

Filed:

Nov 5, 1990

Appl. No.:

7/608946

Inventors:

Eduard Gregor - Pacific Palisades CA
David W. Mordaunt - Canyon Country CA
Katherine V. Strahm - Manhattan Beach CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H03F 700

US Classification:

359327

Abstract:

A Raman converter comprising an input optical pump beam (16) from a laser (18) that propagates through first and second Raman cells (12,24) and causes Stokes shifted waves (14,26) to be generated therein, and a polarizer (34) disposed between the Raman cells (12,24). The polarizer (34) is switchable during laser operation to cause the Stokes shifted waves (14) from the first Raman cell (12) to be circularly or linearly polarized, thereby causing the Stokes shifted waves (26) in the second Raman cell to be generated as rotationally shifted or vibrationally shifted waves respectively. The polarizer (34) may be switched to the selected circular or linear polarization, or may be repeatedly switched therebetween at regular or pseudo-random intervals. A second polarizer (32) may be disposed upstream of the first Raman cell (12) for selectively switching the polarization of the input pump beam (16) during laser operation. The polarizers (32) and (34) may each be used alone or in combination with each other.

US Patent:

49721569, Nov 20, 1990

Filed:

Jun 28, 1989

Appl. No.:

7/372503

Inventors:

Eduard Gregor - Pacific Palisades CA
Alexander R. Muir - Playa Del Rey CA
James S. Sorce - Lawndale CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H01S 310
H01S 313

US Classification:

330 43

Abstract:

A system and method for producing relatively square laser pulses derived from relatively Gaussian laser pulses. The system comprises a phase conjugate laser system that comprises a laser oscillator, an amplifying medium and a phase conjugate mirror having a nonlinear confined at a predetermined pressure. The mirror is adapted to truncate the front portion of an applied laser pulse. A plasma switch is disposed between the laser oscillator and the amplifying medium that has a gas confined therein at a predetermined pressure. The plasma switch and phase conjugate mirror cooperate to truncate the laser pulse to produce a laser pulse having a relatively square shape. Controlling the pressures in the plasma switch and phase conjugate mirror provides a means of controlling the formation of square-shaped laser pulses. In addition, a delay line may be employed in the system that is controllable in length that assists in controlling the truncation of the pulse in the plasma switch. A method of forming a square laser pulse in accordance with the invention comprises the following steps.

US Patent:

59635746, Oct 5, 1999

Filed:

Apr 21, 1998

Appl. No.:

9/063082

Inventors:

Eduard Gregor - Pacific Palisades CA
Tzeng Chen - Rancho Palos Verdes CA
Hans W. Bruesselbach - Monte Hido CA

Assignee:

Raytheon Company - Lexington MA

International Classification:

H01S 3091
H01S 308

US Classification:

372 75

Abstract:

A compact diode pumped laser including a nonuniform, single-or double-sided diode pumped laser head and a polarization output coupled (POC) resonator. The POC resonator employs reflections from two opposing uncrossed roof prism mirrors to produce a uniform near field and far field beam with diffraction or near diffraction limited quality. The single laser head particularly includes a laser rod, a sapphire envelope located about the rod, an area of antireflection coating located on the sapphire envelope between the rod and the diode array, and a high reflectivity nickel-plated indium layer located on the sapphire envelope on the surface thereof outside of the area of antireflection coating.

US Patent:

53175859, May 31, 1994

Filed:

Aug 17, 1992

Appl. No.:

7/930259

Inventors:

Eduard Gregor - Pacific Palisades CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H01S 3045
H01S 3094

US Classification:

372 35

Abstract:

A thermally conducting reflecting envelope for use in laser cavities, and laser apparatus employing such envelopes. A transparent heat conducting member, such as sapphire, surrounds a laser medium and has a transmissive coating thereon that transmits pump light provided by a pump light source onto the laser medium. The coating reflects the diode pump light and transmits laser light to suppress ASE that causes clamping of the laser output at a relatively low level. An absorbing elastic material is disposed on the dielectric coating and is adapted to absorb the laser light. Heat sinks are disposed in contact with the absorbing elastic material, and conducts heat away from the laser medium. A light entrance window or area is antireflection coated to transmit the pump light onto the laser medium. A liquid cooled version further includes a liquid cooling channel disposed between the laser medium and the thermally conducting member.

US Patent:

58412182, Nov 24, 1998

Filed:

Feb 20, 1996

Appl. No.:

8/603670

Inventors:

Eduard Gregor - Pacific Palisades CA
Tzeng S. Chen - Rancho Palos Verdes CA
Mario P. Palombo - Manhattan Beach CA
James S. Sorce - Torrance CA

Assignee:

Hughes Electronics - Los Angeles CA

International Classification:

H01J 102
H01J 724
H01K 158

US Classification:

313 46

Abstract:

A conductively cooled flashlamp (30) for use solid state lasers. The flashlamp (30) has an elongated heat sink (31) with a reflective center channel (32), and a flashlamp tube (12) disposed in the channel (32) that extends beyond the ends of the channel (32). Heat conducting gaskets (37a, 37b) are disposed around respective ends of the envelope (34) that separate the tube (12) from the heat sink (31) to provide an air gap (35) therebetween. Clamps (36a, 36b) contact the gaskets (37a, 37b) and secure the envelope (34) to the heat sink (31). Electrodes (25a, 25b) of the tube (12) extend away from the ends of the tube (12) and heavy wires (38a, 38b) are connected to the electrodes (25a, 25b) and extend longitudinally away from the respective electrodes (25a, 25b). Heat conducting, electrically insulating heat sink members (41a, 41b) are disposed at opposite distal ends of the heat sink (31), and wire clamps (42a, 42b) secure the wires 38a, 38b to the heat sink members (41a, 41b). Thus, the tube (12) is disposed in close proximity to the reflective heat sink (31), which does not directly contact the tube (12).

US Patent:

48488810, Jul 18, 1989

Filed:

Feb 4, 1987

Appl. No.:

7/011393

Inventors:

Osher Kahan - Culver City CA
Eduard Gregor - Pacific Palisades CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

G02F 119
H01S 300

US Classification:

350400

Abstract:

Apparatus and method are disclosed for providing a variable lens and birefringence compensator (10) adapted to be used within the resonator cavity of a repetitively pulsed, variable rate, solid state laser. A cylindrical body of optical material (12) having a temperature dependent index of refraction is thermally coupled to heat exchange means (14) surrounded by potting material (16) and a heat sink (18) which adds heat to or extracts heat from the exterior surface of the cylindrical body in order to establish radially dependent thermal and stress gradients within the body. The heat exchange means is supplied power through leads (20) from the same source (22) which excites the excitation mechanism of the solid state laser. Heat is infused into or extracted from the compensator body at the same rate at which the flashtube stimulates the laser rod (24) within the laser cavity defined by resonator mirrors (26, 28). The thermal gradient is used to create a dynamic lens of opposite power to that of the laser rod which corrects beam divergence in the lased output.

US Patent:

57967709, Aug 18, 1998

Filed:

Oct 11, 1995

Appl. No.:

8/540732

Inventors:

Eduard Gregor - Pacific Palisades CA
Tzeng S. Chen - Ranco Palos Verdes CA
Hans W. Bruesselbach - Monte Nido CA

Assignee:

Raytheon Company - El Segundo CA

International Classification:

H01S 30941
H01S 308

US Classification:

372 75

Abstract:

A compact diode pumped laser including a nonuniform, single- or double-sided diode pumped laser head and a polarization output coupled (POC) resonator. The POC resonator employs reflections from two opposing uncrossed roof prism mirrors to produce a uniform near field and far field beam with diffraction or near diffraction limited quality. The single laser head particularly includes a laser rod, a sapphire envelope located about the rod, an area of antireflection coating located on the sapphire envelope between the rod and the diode array, and a high reflectivity nickel-plated indium layer located on the sapphire envelope on the surface thereof outside of the area of antireflection coating.