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| Number | Title | Issue Date |
| 4779277 | Free electron laser injection oscillator A free electron laser for use with a short-pulse relativistic electron source. The device includes a resonant optical cavity in which a spatially-periodic magnetic field is produced by a wiggle magnet assembly. An input optical beam having a wavelength ly... | 10/18/1988 |
| 4734699 | Doppler-improved polyphase pulse expander-compressor A method and apparatus for reducing cyclic losses due to doppler shifting frequency-derived phase coded expanded radar pulses using new expanded pulse codes which increase the number of phase elements without increasing compression ratios. These new expa... | 03/29/1988 |
| 4689628 | Adapive sidelobe canceller system An improved signal processing technique for developing a plurality of indndent samples, particularly for use in a canceller system receiving interference from a plurality of sources. Each of a plurality of signal channels sample the environment from a pl... | 08/25/1987 |
| 4661819 | Doppler tolerant binary phase coded pulse compression system A Doppler tolerant binary phase coded pulse compression system. An input pulse is converted to a binary coded sequence of pulses according to a phase code. The sequence of pulses is used to frequency code a transmitted carrier. Echo returns are demodulate... | 04/28/1987 |
| 4660164 | Multiplexed digital correlator A high speed multiplexed digital correlator device for correlating serial data against reference data. The device includes a plurality of digital correlators configured to operate in parallel with their operations overlapping in time. The serial data is d... | 04/21/1987 |
| 4653917 | Fiber optic gyroscope operating with unpolarized light source A fiber optic gyroscope comprising a Sagnac interferometer including a (3×3) optical directional coupler. The gyroscope is driven with an essentially unpolarized broadband spatially coherent light beam supplied by a super-luminescent diode source. A sign... | 03/31/1987 |
| 4633255 | Method for sea surface high frequency radar cross-section estimation using Dopler spectral properties A method for estimating the high frequency radar cross-section of the sea surface. A Doppler spectrum of the sea surface is obtained by correlating returns from high frequency radar signals. Approach and recede Bragg spectral lines and a zero Doppler freq... | 12/30/1986 |
| 4631500 | Microwave frequency divider having regenerative oscillation A microwave frequency divider circuit. The frequency divider comprises a nonlinear amplifier including input and output ports for amplifying signals applied to the input port. The amplifier exhibits a nonlinear transconductance characteristic between its ... | 12/23/1986 |
| 4575179 | Integrated optical signal processor using diffraction of light by magnetostatic waves An integrated optical signal processor device. The device includes a thin film of yttrium iron garnet ferrite material formed on a gadolinium gallium garnet substrate. A guided optical beam in a first polarization mode is directed through the thin film. A... | 03/11/1986 |
| 4566013 | Coupled amplifier module feed networks for phased array antennas A beam-steering feed network for use with linear and planar phased-array enna systems which includes a phase divider system for producing a plurality of incrementally phased IF signals. The phase divider system includes a plurality of coupled amplifier p... | 01/21/1986 |
| 4554483 | Active circulator gyrotron traveling-wave amplifier An RF cyclotron maser type traveling-wave amplifier including an integral active circulator. The amplifier includes a tapered interaction waveguide having a cross-section which gradually increases from a small first end to a larger second end thereof. The... | 11/19/1985 |
| 4552457 | Fiber optic interferometer using two wavelengths or variable wavelength A fiber optic interferometric physical sensor. A fiber optical Mach-Zehnder interferometer includes a sensor arm and a reference arm having different optical path lengths. A transducer coupled to the sensor arm modulates the phase of light signals passing... | 11/12/1985 |
| 4538275 | Synergistic quasi-free electron laser A synergistic quasi-free electron laser for generating infrared radiation. The laser includes a means for producing a volume of ionized gas plasma, a means for directing an electron beam through the gas plasma in a first direction, and a means for directi... | 08/27/1985 |
| 4530078 | Microbending fiber optic acoustic sensor A microbending fiber optic acoustic sensor. A point hydrophone according to a first preferred embodiment of the present Invention includes two opposed pistons which are subjected to an acoustic pressure wave. In response to the pressure wave, the opposed ... | 07/16/1985 |
| 4521887 | W-shaped diffused stripe GaAs/AlGaAs laser A w-shaped diffused stripe GaAs/AlGaAs laser and a method for making the e. A double heterostructure layered structure includes a p-type GaAs active layer in contact with a p-type AlGaAs current blocking layer. These layers are sandwiched between two N-t... | 06/04/1985 |
| 4517674 | Zinc-diffused narrow stripe AlGaAs/GaAs double heterostructure laser A zinc-diffused narrow stripe AlGaAs/GaAs double heterostructure laser device and a method of making the same. A double heterostructure layered structure including a p-type GaAs active layer sandwiched between two n-type AlGaAs confinement layers is forme... | 05/14/1985 |
| 4513424 | Laser pumped by X-band microwaves A laser device pumped by RF microwaves at frequencies in the range of 8 to 12 GHz (X-band). An optical cavity containing a lasing medium is located within an RF cavity resonant at a frequency in the X-band. X-band RF energy is supplied from an RF source t... | 04/23/1985 |
| 4512660 | Picosecond broadband cars probe using the picosecond continuum A coherent anti-Stokes Raman spectroscopy (CARS) method and apparatus for producing a broadband CARS vibrational spectrum of a sample in a single picosecond laser pulse. A laser pulse having a picosecond duration and a frequency of ω is directed into a l... | 04/23/1985 |
| 4505023 | Method of making a planar INP insulated gate field transistor by a virtual self-aligned process A planar compound semiconductor insulated gate field effect transistor and a virtual self-aligned process for making the same. The device includes a semi-insulating InP substrate in which doped source and drain regions separated by a channel region are lo... | 03/19/1985 |
| 4506234 | Amplitude and phase modulation in fin-lines by electrical tuning A fin-line waveguide device for modulating signals passing therethrough. The device comprises a fin-line waveguide including two channel members longitudinally extending in the direction of signal propagation through the device. The channel members are ph... | 03/19/1985 |
| 4495411 | Fiber optic sensors operating at DC A fiber optic sensor for detecting and/or measuring a physical quantity varying at any frequency from a maximum desired frequency down to zero frequency with minimum disturbance from environmentally induced perturbations. A first highly birefringent optic... | 01/22/1985 |
| 4494039 | Gyrotron traveling-wave device including quarter wavelength anti-reflective dielectric layer to enhance microwave absorption A gyrotron traveling-wave device including quarter wavelength anti-reflece dielectric layers to enhance microwave absorption. A drift tube made from a hollow waveguide is positioned within the gyrotron to surround an electron beam passing from an electro... | 01/15/1985 |
| 4481485 | Optically triggered transferred-electron device microwave burst and single pulse generators Transferred-electron device (TED) microwave burst and single pulse generators which are triggered by picosecond optical pulses. The burst generator includes a TED having a cathode, an anode, and a gate electrode positioned therebetween, all located on a s... | 11/06/1984 |
| 4476549 | Calibration method for acoustic scattering measurements using a spherical target A method for calibrating acoustic backscattering instrumentation utilizing spherical body as a standard target. A spherical body made of high specific acoustic impedance material, such as tungsten carbide, is positioned a given distance from a source/rece... | 10/09/1984 |
| 4448000 | High temperature ultra-high vacuum infrared window seal A window seal apparatus capable of transmitting infrared radiation for use under high temperature ultra-high vacuum conditions. The apparatus includes a window clamped between an annular rim of a clamp flange and an annular rim of a sealing flange. The ri... | 05/15/1984 |
