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7164526 |
Parametric amplification using two pump waves
An optical parametric amplifier (OPA) driven with at least two pump waves. The pump waves may be configured such that the OPA produces uniform exponential gain over a range of wavelengths that...
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6870664 |
Nondegenerate optical parametric chirped pulse amplifier
A system provides an input pump pulse and a signal pulse. A first dichroic beamsplitter is highly reflective for the input signal pulse and highly transmissive for the input pump pulse. A first...
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6611168 |
Differential parametric amplifier with physically-coupled electrically-isolated micromachined structures
A micromachined variable capacitor structure is used as a modulation mechanism for a differential parametric amplifier. The capacitance of the capacitor structure is modulated by a control signal...
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6281746 |
Parametric cavity microwave amplifier
A microwave parametric amplifier uses a circulator to receive an input signal which is provided through a transfer port to an input signal resonant cavity. A pump signal, which is preferably a...
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6265934 |
Q-switched parametric cavity amplifier
A Q-switched parametric cavity microwave amplifier has input and output ports for receiving an input signal and producing a switched amplified output signal. A pump signal, preferably at a harmonic...
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5401953 |
Optically-switched submillimeter-wave oscillator and radiator having a switch-to-switch propagation delay
A submillimeter wave-generating integrated circuit includes an array of N photoconductive switches biased across a common voltage source and an optical path difference from a common optical pulse...
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5075573 |
Low-noise optical wave amplification device
The invention relates to a low-noise amplification device of an optical wave. Signal wave (F s ) to be amplified interferes with a pump wave (F p ) in such a nonlinear medium (1) as a...
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4984298 |
Wideband low noise detector
Low noise devices such as e.g., detectors of electromagnetic signals utilize parametric amplifiers to produce squeezed noise states at pairs of frequencies symmetrically located about a common,...
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4906949 |
Monomode optical source and an optical amplifying device tuneable in the near infra red and application to selective and regeneration amplifying devices
The source and the device comprise a generator of a pump wave, optical means for coupling with a monomode optical fiber for guiding and highly confining the pump wave so that a four photon non...
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4639923 |
Optical parametric oscillator using urea crystal
A new optical parametric oscillator which employs a urea crystal is disclosed. The organic crystal makes the oscillator broadly tunable, so that the entire spectral range from the ultraviolet to...
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4622510 |
Parametric electric machine
A parametric electric machine consists of a series resonant circuit, which has a capacitance (C) which is adapted to be mechanically varied, an inductance (L) and a resistance (R). The no-load...
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4618783 |
Production of short light pulses by time compression
Mono-pulses of light are generated by time compression of laser energy. A Raman medium is located in a low Q energy storage cavity having low losses for light at a predetermined frequency and...
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4604551 |
Cyclotron resonance maser system with microwave output window and coupling apparatus
A cyclotron resonance maser system includes coaxial coupling between coaxial wave guides. Such coupling is provided between an outer coaxial waveguide through which a gyrotron electron beam passes...
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4325144 |
Hysteretic SIS junction mixer
The present invention relates to a subharmonically pumped hysteretic superconductor-insulator-superconductor (SIS) junction mixer. The hysteretic junction (10), achieved by not suppressing the...
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4313223 |
Signal-amplification frequency-conversion apparatus having a common active component
A frequency-conversion apparatus including, among others, a single active component in common use for signal amplification and local oscillation with its operating point selected in its linear...
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4306195 |
Pulse compressor with saturation-matched focusing geometry
A backward-wave Raman amplifier or pulse compressor for compressing laser pulses. A laser pulse, or pump beam, of relatively long duration enters one end of the compressor. A short, initiating...
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4288765 |
Frequency selector apparatus
A frequency selector apparatus which effects a frequency selection by providing at least one reflecting electrode at a position adjacent elastic surface wave transducer or transducers provided in...
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4224577 |
Multistaged stokes injected Raman capillary waveguide amplifier
A multistaged Stokes injected Raman capillary waveguide amplifier for providing a high gain Stokes output signal. The amplifier uses a plurality of optically coupled capillary waveguide amplifiers...
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4222011 |
Stokes injected Raman capillary waveguide amplifier
A device for producing stimulated Raman scattering of CO 2 laser radiation by rotational states in a diatomic molecular gas utilizing a Stokes injection signal. The system utilizes a cryogenically...
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4215323 |
Instability and regenerative pulsation in optical cavities
A new mode of operation of an optical cavity is disclosed. In this "regenerative pulsation" mode, a substantially nonvarying input yields an output consisting of a train of pulses. Fractional...
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4160956 |
Nuclear-pumped uranyl salt laser
A direct nuclear radiation pumped laser consisting essentially of a uranyl salt with a UO 2 + + uranyl ion enriched in the U 235 isotope sufficient to sustain a fission chain reaction, the uranyl...
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4160215 |
Single diode upper sideband terminated parametric amplifier
A single varactor diode parametric amplifier is described which has a broadband termination at the upper sideband frequency in the pump waveguide. This termination presents an open circuit...
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4128772 |
Generation of tunable far-infrared radiation
A tunable far infrared generator makes use of a four-photon mixing process that cycles among highly excited atomic states, the lowest of which states is reached from the atomic ground state by a...
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4063105 |
Method of and apparatus for generating tunable coherent radiation by noncollinear phase-matched sum-difference frequency optical mixing
Schemes for generating tunable coherent radiation by noncollinear phase-matched sum-difference frequency optical mixing in a nonlinear medium for use, by way of illustration, in connection with...
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4058739 |
Method and apparatus for phase matching by adjustment of the fundamental frequencies
A method and apparatus for phase-matching the output of a four-wave nonlinear optical mixing process is disclosed. The method produces phase-matching that is independent of variations in density of...
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4056784 |
Suppression of parametric oscillations in IMPATT amplifiers and oscillators
A balanced circuit for IMPATT amplifiers and oscillators, which includes at least one pair of anti-series connected matched avalanche diodes electrically connected to the junction of a balanced and...
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4050027 |
Optical signal amplifier
Amplification of optical signals propagating through a first waveguide is achieved by modulation of high intensity light propagating through an elastomeric waveguide responsive to said signals, the...
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4028637 |
Parametrically-stable negative resistance diode circuit
A parametrically-stable microwave circuit comprises in cascade a negative resistance diode, a stabilizing network, and a complementary type filter. The complementary type filter presents a...
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4011462 |
Pulsed infrared difference frequency generation in CdGeAs.sub.2
The disclosure relates to a laser apparatus for generating a line-tunable pulsed infrared difference frequency output. The apparatus comprises a CO 2 laser which produces a first frequency, a CO...
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3992675 |
Broadband, upper sideband terminated, low-noise parametric amplifier
A parametric amplifier which includes series coupled diodes contained in a resonating wave guide for providing a low noise figure by limiting the impedance to the idler circuit and inhibiting...
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3934208 |
Low noise modular parametric amplifier
The low noise parametric amplifier disclosed is a non-cryogenic non-redundant plural stage unit with excess gain such that failure of any one stage results in only minor degradation of...
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3931623 |
Reliable earth terminal for satellite communications
A reliable earth terminal for satellite communications systems capable of unattended operation for extended periods of time is disclosed. The terminal includes an antenna with a single fixed...
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3883752 |
Optical material
The substances proustite Ag 3 AsS 3 and pyrargyrite Ag 3 SbS 3 and solid solutions of the two are useful non-linear materials and have applications in non-linear devices. They occur in nature...
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3875422 |
Four photon parametric amplification in glassy optical waveguides
An optical parametric amplifier is provided in a glassy material in optical waveguiding fiber form. The fiber is moderately multi-moded with respect to the intended pump and signal wavelengths,...
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3867708 |
TRANSMISSION SYSTEM WITH CABLE FOR TRANSMISSION OF HIGH FREQUENCY SIGNALS
A signal conductor is wound on a soft magnetic core with step-function permeability and extending for the length of the transmission line. A control conductor is also wound on the core and passes a...
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3858056 |
MEANS AND METHOD FOR STABILIZED OPTIMIZED TEMPERATURE PHASE MATCHED OPTICAL PARAMETRIC GENERATION
A means and method for automatically adjusting the temperature of a non-linear crystal used in the generation of optical parametric beams regardless of changes in any other parameters of the system...
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3833931 |
MULTICHANNEL SPIN RESONANCE FREQUENCY MEMORY DEVICE
Frequency memory device composed substantially of a multiple frequency spin induction damped oscillator, the said oscillator being composed of a magnetic spin resonance inductor, joined by means to...
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3779631 |
OPTICAL CORRELATOR HAVING A DYE AMPLIFIER FOR AMPLIFYING CORRELATING PORTIONS OF SIGNALS
An optical correlator in which a Fourier transform signal representing one image, and a Fourier transform holographic interference signal representing another image are projected onto an organic...
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3772528 |
OPTICAL PARAMETRIC DEVICE
An optical parametric device is described which may be used as an amplifier, oscillator, or frequency converter, and which is operable in the infrared or visible spectral regions. The device...
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3711780 |
NONRECIPROCAL REACTANCE AMPLIFIER ARRANGEMENT
A non-reciprocal reactance amplifier arrangement comprising the cascade connection of an up-converter or mixer and a down-converter or mixer whose reactance diodes are pumped in opposite phase by a...
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3700912 |
RADIATION-RESISTANT LINBO AND OPTICAL DEVICES UTILIZING SAME
Room temperature use of LiNb0 3 in devices involving transmission of coherent radiation has been restricted by the observation that the material "damages" in relatively short periods at commonly...
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3699454 |
DEGENERATE PARAMETRIC AMPLIFIER RECEIVER
A high frequency receiving system for angle modulated signals is disclosed. A degenerate parametric amplifier is combined with unique circuitry and operated in a manner which provides low-noise...
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3696312 |
CYCLOTRON RESONANCE DEVICES CONTROLLABLE BY ELECTRIC FIELDS
Electric field controllable devices which operate on the principle of velocity change of a wave passing therethrough. These waves can be magneto-elastic or spin waves, including surface waves. The...
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3694055 |
THIN FILM, BIAXIALLY BIREFRINGENT NONLINEAR DEVICES
Phase matching for different frequency waves of electromagnetic energy is accomplished within a thin film of nonlinear material in which the index of refraction for a wave polarized orthogonal to...
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3688124 |
SPATIALLY PERIODIC NONLINEAR STRUCTURES FOR FREQUENCY CONVERSION OF ELECTROMAGNETIC ENERGY
This disclosure describes the use of spatially periodic media which are nonlinear in response to electromagnetic waves. Various devices which perform second harmonic generation, mixing, and...
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3679907 |
LITHIUM FORMATE NONLINEAR DEVICES
The hydrated and deuterated forms of lithium formate are found to be useful nonlinear materials for use over a wavelength range including the visible spectrum. While conversion efficiency is...
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3676808 |
RESONATOR FOR ELECTROMAGNETIC WAVES OF THE MILLIMETRIC AND SUBMILLIMETRIC BAND
A resonator for electromagnetic waves of the millimetric and submillimetric band, comprising main reflectors in the form of mountings wherein parallel conductors are strung at a spacing smaller...
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3670271 |
TWO PORT MAGNETOELASTIC DELAY LINE
A two part magnetoelastic delay line in which the coupling elements of an electromagnetic coupling structure are arranged in a colinear configuration at the end-face of a piece of single crystal...
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3665204 |
ACOUSTO-OPTIC TUNING OF OPTICAL SECOND HARMONIC GENERATORS AND OTHER PARAMETRIC DEVICES
An input optical wave and an input acoustic wave are incident upon an optically nonlinear crystal to form a phase-matched intermediate acousto-optical wave propagating in the crystal. By...
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3663886 |
PARAMETRIC AMPLIFIERS WITH IDLER CIRCUIT FEEDBACK
Two parametric amplifiers connected such that there is feedback from the idler circuit of one of the amplifiers to the idler circuit of the other amplifier to effect noise reduction.
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