Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 7421212 | Detecting and locating pulses using a Bragg cell Detecting a pulse of a signal includes receiving the signal and a light beam. The signal drives a spatial light modulator to modulate the light beam, where the complex amplitude of the modulated light beam is proportional to the signal current. The modulated light b... | 09/02/2008 |
| 7355162 | Optical wavelength measuring device using guiding body and diffractive structure An optical characterization device has a guiding body and a diffractive structure integrated with it. The guiding body delivers radiation to the diffractive structure at a preselected angle and the diffractive structure diffracts at least a portion of radiation guid... | 04/08/2008 |
| 7332705 | Method for high speed microscopy with three-dimensional laser beam scanning A system and method for independently controlling the collimation and lateral positioning of a light beam comprises at least one acousto-optic deflector and a pair of counter propagating acoustic waves with offset frequencies. While the frequency offset controls the... | 02/19/2008 |
| 7274718 | Electronic alignment of acousto-optic modulator for modulating a laser A method and apparatus are provided to modulate a beam of laser light. An acousto-optic modulator (AOM) is positioned to receive continuous-wave (CW) laser light at an angle approximating the Bragg angle. Fine tuning of the modulation is then used to compensate for ... | 09/25/2007 |
| 7221869 | System and method for classifying high speed data signals utilizing low frequency electrical spectral characteristics A system for identifying transmission rates of an optical signal transmitted in an optical communication network includes a signal converter for converting a sample of the optical signal to an electrical signal. A frequency analyzer analyzes the electrical signal to... | 05/22/2007 |
| 6967613 | Broadband waveform reconstruction for radar Resolution of a radar operating within a bandwidth is improved by defining a quantity of substantially rectangular sub-band filters to subdivide the bandwidth in the frequency domain into the quantity of sequential sub-bands having a sub-bandwidth. Each signal sent ... | 11/22/2005 |
| 6940599 | Envelope functions for modulation spectroscopy A spectrometer and spectrometry method comprising modulating a light source with a carrier waveform multiplied by an envelope function, directing light from the light source through a sample region and to a photodetector, and demodulating current from the photodetec... | 09/06/2005 |
| 6686997 | Apparatus and a method for pulse detection and characterization An optical/analog/digital pulse detector receives an input signal and drives a Bragg cell illuminated by a collimated light beam. The Bragg cell spatially modulates the collimated light beam and upon exiting the Bragg cell is imaged by lenses of an optics... | 02/03/2004 |
| 6603536 | Hybrid optical correlator/digital processor for target detection and discrimination An optical correlator is used to detect the presence of a target in a laser detection and ranging (LADAR) system by analyzing the return signal, and to provide initial estimates of the targets range and velocity to the LADAR receiver. The optical correlat... | 08/05/2003 |
| 6509729 | Multiple simultaneous optical frequency measurement A signal processing apparatus for providing concurrent electrical frequency measurements of multiple, time-coincident signal inputs. In one embodiment of the present invention, an input signal is received that contains a plurality of individual signals in... | 01/21/2003 |
| 6501258 | Optical spatial frequency measurement A signal processing apparatus for providing electrical frequency measurements of input signals. In one embodiment, a power splitter divides an RF input signal into first and second input signals. An RF channelizer having a filter bank receives the first i... | 12/31/2002 |
| 6307895 | Complex Fourier coefficient extractor A system for extracting the complex Fourier coefficients from an unknown RF signal to classify the RF signal is disclosed. The extraction system utilizes optical signal processing in combination with the generation of electronic timing and control signals... | 10/23/2001 |
| 5717401 | Active recognition system with optical signal processing An active recognition system comprises a transceiver, tracking electronics, an optical processor, and a data handler. The transceiver transmits chirped pulses and receives a series of reflected replicas of the chirped pulse! replica pulses from featur... | 02/10/1998 |
| 5682238 | Multiple, parallel, spatial measurement of electrical phase A signal processing apparatus for providing accurate electrical phase difference measurement of multiple concurrent signal inputs is disclosed. Phase measurement of an individual signal input is accomplished utilizing an efficient spatial sampling scheme.... | 10/28/1997 |
| 5663736 | Multi-element true time delay shifter for microwave beamsteering and beamforming In a broad aspect the present invention comprises a multiple element, multi-throw electronic switch for a fiber optical cable network. The multiple element, multi-throw electronic switch includes a bulk media optical deflector angularly controllable by se... | 09/02/1997 |
| 5585714 | Wide bandwidth RF spectrum analyser A broadband electrical signal spectrum analyser comprises a spatial light modulator such as a Bragg cell located within at least one resonant cavity and illuminated by a polychromatic source of light. The signal to be analysed is connected to the Bragg ce... | 12/17/1996 |
| 5481183 | Electro-optic spectrum analyzer A broadband spectrum analyzer for radio frequency and microwave signals. The signal to be analyzed modulates an optical laser beam through an electro-optic modulator. The resultant modulated beam thus comprises light at a frequency (carrier frequency) cor... | 01/02/1996 |
| 5327142 | Frequency encoding circuit in Bragg cell receiver The circuit may be used to encode the channel outputs of a Bragg cell receiver, or other type of channelized receiver. Bragg cell receivers use acousto-optic delay lines to analyze signals such as radar pulses present in the Electronic Warfare (EW) enviro... | 07/05/1994 |
| 5281907 | Channelized time-and space-integrating acousto-optical processor A novel channelized, hybrid time- and space-integrating acousto-optic (AO) spectrum analyzer is described. The architecture consists of two acousto-optic cells in a crossed cell configuration. The first acousto-optic cell is a wide bandwidth device that p... | 01/25/1994 |
| 5166598 | Microwave transient analyzer A method and apparatus for capturing and recording indications of frequency content of electromagnetic signals and radiation is disclosed including a laser light source (12) and a Bragg cell (14) for deflecting a light beam (22) at a plurality of deflecti... | 11/24/1992 |
| 5028864 | Optically stable, large time bandwidth acousto-optic heterodyne spectrum analyzer with fixed non-zero heterodyne output A common-path interferometric acoustic-optic heterodyne spectrum analyzer ving high immunity to ambient vibration uses two, counter-propagating beams, two Bragg cells for beam diffraction, a series of waveplates and a birefringent quartz wedge. Proper lig... | 07/02/1991 |
| 5027055 | Compact optical RF spectrum analyzer An improved compact optical and rugged laser-driven RF spectrum analyzer ng made up of slab-like waveguide means. The waveguide means has at one end enhanced surface diffraction grating means for intercepting and selectively diffracting a laser source be... | 06/25/1991 |
| 4722596 | Acousto-optic analyzer with dynamic signal compression An acousto-optic spectrum analyzer in which the dynamic range is effectively extended by detecting the frequency bands wherein the photo-detectors are saturated and providing a filter to suppress those frequencies. With this pre-filter, the entire spectru... | 02/02/1988 |
| 4712059 | Broadband optical processor for determination of frequency and time of arrival of multiple signals A real time, optical processor for the detection and separation of multiple frequency hop signals and which is capable of determining both the frequency and the time of arrival for all frequencies within a specified bandwidth.... | 12/08/1987 |
| 4652817 | Acousto-optic chip rate detector Acousto-optical apparatus for determining the chip rate of a pseudo-random sequence of signals.... | 03/24/1987 |
| 4644267 | Signal analysis receiver with acousto-optic delay lines The system makes use of an interferometric Bragg cell for the time delays needed by the multiple antenna inputs in an angle-of-arrival (AOA) measurement system, for accurate measurements over wide bandwidths. A signal Bragg cell is modulated with a select... | 02/17/1987 |
| 4636718 | Acousto-optical spectrum analyzer with expanded frequency resolution This invention is directed to a spectrum analyzer system which is laser-driven and which includes a standard Bragg cell and a standard photo-diode array as the output detector. In this system, the Bragg cell is driven by a bandwidth expansion circuit whic... | 01/13/1987 |
| 4633170 | Bragg cell spectrum analyzer A Bragg cell RF spectrum analyzer of the type having a laser input wherein the laser input is coupled to the Bragg cell analyzer by a signal-mode optical fiber for the purpose of improving the spatial quality of the laser, thus limiting side lobes of the ... | 12/30/1986 |
| 4633171 | Window function for an aperture window A window function optimum for apodization of diffraction at an aperture of a Bragg Cell spectral analyzer. A window function is derived which is simpler to realize and which comes very close to an optimum window function.... | 12/30/1986 |
| 4626102 | Bragg cell spectral analyzer with a prism expansion system A Bragg cell spectral analyzer with a prism expansion system for a laser beam, which has a Gaussian cross-sectional distribution of light intensity, is generally superimposed with stray light, and is conducted along a path through the system to a Bragg ce... | 12/02/1986 |
| 4612545 | Automatic frequency identifier for radar signals The invention provides a means for determining rapidly and accurately frequency information of electromagnetic radiation. It combines the operation of an Instantaneous Frequency Measurement receiver with the operation of an Instantaneous Fourier Transform... | 09/16/1986 |
| 4503388 | Acousto-optic signal detection system A system is shown which receives several radio frequency (RF) signals and applies these signals to a Bragg cell through which a beam of coherent light is passed and diffracted into several first order beamlets. The diffraction angle of the beamlets is a f... | 03/05/1985 |
| 4503382 | Method and device for centroid detection of a beam of electromagnetic energy A device for detecting the centroid of a beam of electromagnetic energy is shown including means for focusing the beam into a blur spot upon a focal plane. Photodetectors located at the focal plane detect the centroid of the blur spot on either side of it... | 03/05/1985 |
| 4467276 | Arrangement for evaluating an optical beam A high-resolution Bragg-cell receiver for monitoring and/or analyzing the frequency of RF signals comprises a lightwave guide arrangement with discrete photodiodes coupled thereto which is substituted for a photodiode array. The guide has closely spaced i... | 08/21/1984 |
| 4328576 | Wide band demodulator of phase modulated signals A wide band demodulator of phase modulated radio frequency signals is disclosed, wherein first and second sets of sonic waves are generated within a Bragg cell, one set being phase shifted with respect to the other set, together with means for directing a... | 05/04/1982 |
| 4253060 | RF Spectrum analyzer Apparatus is provided comprising a laser source, a collimating lens, a focussing lens and a detector array disposed along an optical path. A surface acoustic wave transducer is disposed between the collimating and focussing lenses and is adapted to modula... | 02/24/1981 |
| 3942109 | Sweeping spectrum analyzer A sweeping spectrum analyzer for analyzing the frequency and amplitude of an input signal is comprised of a Bragg cell with a laser beam input and an accoustic signal input. An input signal is mixed with a sweep signal to produce a heterodyned signal with... | 03/02/1976 |
