Frederick W Martin

US Patent:

50528041, Oct 1, 1991

Filed:

Nov 1, 1990

Appl. No.:

7/607976

Inventors:

Frederick Martin - Menlo Park CA

Assignee:

GTE Government System Corporation - Stamford CT

International Classification:

G02B 2310

US Classification:

356256

Abstract:

A non-imaging optical telescope having a variable field-of-view utilizes an atomic resonance filter within its non-reflective tube. The atomic resonance filter received incoming light through the aperture of the telescope and re-emits the light to an optical sensor. The field-of-view is a function of the distance of the atomic resonance filter from the aperture. A positioning mechanism is provided to move the atomic resonance filter within the tube, thereby varying the field-of-view.

US Patent:

50794140, Jan 7, 1992

Filed:

Oct 9, 1990

Appl. No.:

7/594771

Inventors:

Frederick Martin - Menlo Park CA

Assignee:

GTE Government Systems Corporation - Stamford CT

International Classification:

G01J 120

US Classification:

2502033

Abstract:

A tracking system to enable a tracking telescope follow a light source, utilizes an atomic resonance filter positioned in close proximity to said telescope, and imaging optics positioned between the light source and the atomic resonance filter. The atomic resonance filter is positioned such that light signals from the light source pass through the imaging optics and are focused in a region within its interior. A plurality of optical sensors are positioned to detect re-emitted light signals from the atomic resonance filter. The optical sensors convert the detected re-emitted light signals to electrical signals proportional to the intensity of said re-emitted light signals. The telescope is repositioned by using these differences in electrical signals to equalize the re-emitted light signals detected by each of the optical sensors, thereby pointing the telescope directly at incoming light from the light source. Several configurations of the imaging optics, the atomic resonance filter and the optical sensors are possible.

US Patent:

50384066, Aug 6, 1991

Filed:

Sep 19, 1989

Appl. No.:

7/409174

Inventors:

Paul J. Titterton - Palo Alto CA
Frederick Martin - Menlo Park CA
Dan J. Radecki - San Jose CA
Robert W. Cotterman - Rocklin CA

Assignee:

GTE Goverment Systems Corporation - Mountain View CA

International Classification:

H04B 1000

US Classification:

359113

Abstract:

An arrangement for secure two-way tactical laser communications between a submarine submerged in an ocean and an airborne platform. During an initital acquisition mode, the airborne transceiver sends a downlink pulse-modulated blue-green laser beam to the ocean surface and below using a predetermined IFF code to identify the transceiver to the submarine. In the preferred embodiment the transmit optics spread the beam out into an elongated elliptically-shaped pattern to maximize coverage of the search area. When the downlink beam energy is within range of the submarine, an optical receiver on the submarine detects the beam, filters out the background light with a very narrow-band filter, and converts the light pulses to equivalent electrical pulse. A signal processor in the submarine receiver decodes the electrical pulses and verifies the IFF code to prevent the submarine from responding to a laser beam from an unfriendly source. If the IFF is verified, the submarine laser transceiver transmits a pulse-modulated uplink beam response at the same wavelength, but timed so that the light pulses are time interleaved with the downlink pulses.

US Patent:

47605375, Jul 26, 1988

Filed:

Nov 29, 1985

Appl. No.:

6/803034

Inventors:

Frederick Martin - Menlo Park CA
John G. Willman - Santa Clara CA

Assignee:

GTE Government Systems Corporation - Stamford CT

International Classification:

G01R 2300

US Classification:

364518

Abstract:

A two-dimensional image and energy profile of the output from a pulsed laser is analyzed on a pulse-by-pulse basis by a video graphics image processing system coupled to a minicomputer. An intensity distribution in psuedo color for the full beam is formed by the processor and displayed on a color monitor in real time. The minicomputer performs analytical measurements in two dimensions on the beam shape and size as well as on the pulse timing properties of the laser. The system serves as a real time diagnostic tool for laser development.

US Patent:

51248590, Jun 23, 1992

Filed:

May 24, 1991

Appl. No.:

7/705477

Inventors:

Frederick Martin - Menlo Park CA
Timothy Fohl - Carlisle MA

Assignee:

GTE Government Systems Corporation - Mountain View CA
GTE Laboratories, Incorporated - Waltham MA

International Classification:

G02B 524

US Classification:

359886

Abstract:

A narrow passband, reflective optical filter at a wavelength L, has a container filled with a pressurized gas, the pressurized gas having a ground state transition corresponding to the wavelength L and transparent to all other wavelengths. The container has at least one optically transparent major planar surface serving as the face thereof, whereby incoming broadband light is absorbed by the gas, except at its resonance wavelength L, which is specularly reflected. The optically transparent face of the container optionally has a broadband anti-reflective coating to improve its out-of-band rejection of unwanted wavelengths of the light signal. An optical system utilizing this narrow passband, reflective optical filter has at least one optical element to focus incoming broadband optical signals on the optically transparent face of the narrow passband, reflective optical filter and an optical signal detection component positioned to detect reflected narrowband light of wavelength L specularly reflected from the filter. An optical imaging system utilizing this narrow passband, reflective optical filter has at least one narrow passband, reflective optical filter, at least one optical element to focus incoming broadband optical signals on the optically transparent face of the filter, and an imaging optical signal detection component positioned to detect and view reflected narrowband light of wavelength L specularly reflected from the filter, thereby providing an image of the source of the optical signals.

US Patent:

49951017, Feb 19, 1991

Filed:

Sep 19, 1989

Appl. No.:

7/409208

Inventors:

Paul J. Titterton - Palo Alto CA
Frederick Martin - Menlo Park CA
Dan J. Radecki - San Jose CA
Robert W. Cotterman - Rocklin CA

Assignee:

GTE Government Systems Corporation - Mountain View CA

International Classification:

H04B 1000

US Classification:

455607

Abstract:

A method of providing secure tactical communications between a submerged submarine and an airborne platform using a pulse-modulated blue-green laser beam. During an initial acquisition mode, the airborne transceiver sends out a downlink laser beam to the ocean surface and below using a predetermined IFF code to identify the transceiver to the submarine. In the preferred embodiment the transmit optics spread the beam out into an elongated elliptically-shaped pattern to maximize coverage of the search area. When the downlink beam energy is within range of the submarine, an optical receiver on the submarine detects the beam, filters out the background light with a very narrow-band filter, and converts the light pulses to equivalent electrical pulses. A signal processor in the submarine receiver decodes the electrical pulses and verifies the IFF code to prevent the submarine from responding to a laser beam from an unfriendly source. If the IFF is verified, the submarine laser transceiver transmits a pulse-modulated uplink beam response at the same wavelength, but timed so that the light pulses are time interleaved with the downlink pulses.

US Patent:

20220302888, Sep 22, 2022

Filed:

Sep 29, 2021

Appl. No.:

17/488920

Inventors:

- Greensboro NC, US
Gangadhar Burra - Fremont CA, US
Frederick L. Martin - Plantation FL, US
Mark Briffa - Tyreso, SE
Amin Shahverdi - Murphy TX, US
Elias Reese - Dallas TX, US
Nikolaus Klemmer - Dallas TX, US
Jeff Gengler - McKinney TX, US

International Classification:

H03F 3/24
H03F 1/30
H03F 1/02
H01L 29/20

Abstract:

A power amplifier with a quasi-static drain voltage adjustment is provided that has a transistor that is made from Gallium Nitride (GaN). In an exemplary aspect, the transistor is a field-effect transistor (FET) having a source, gate, and drain. The transistor is tested for process variations. Based on detected process variations, a microcontroller may raise a drain voltage to increase output power capability. Power capability of the power amplifier scales as the square of the drain voltage, so small adjustments are sufficient to offset the slow process corner while maintaining reliability