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| Number | Title | Issue Date |
| 7242517 | Optical devices comprising series of birefringent waveplates Bidirectional isolating devices including non-reciprocal rotators (i.e. Faraday rotators) and wavelength selective reciprocal polarization rotators are disclosed. Each wavelength selective rotator behaves like a half-wave retarder in a first frequency range and beha... | 07/10/2007 |
| 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 extends, for example, at least 30 nm on either side of the average pump-w... | 01/16/2007 |
| 7135917 | Left-handed nonlinear transmission line media A left-handed nonlinear transmission line system has multiple nonlinear capacitors connected in series between input and output terminals and multiple inductances connected in parallel between the nonlinear capacitors and a return conductor extending between the inp... | 11/14/2006 |
| 7003005 | Simplified laser oscillator-amplifier system The present invention contemplates a simplified laser oscillator-amplifier system for deep UV generation. The simplified system employs same type of gain media in both the oscillator and the amplifier and utilizes a single pump pulse split to pump both the oscillato... | 02/21/2006 |
| 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 optical parametric amplifier nonlinear crystal transfers part of the ene... | 03/22/2005 |
| 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 while a differential signal is applied to the capacitor str... | 08/26/2003 |
| 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 harmonic of the input signal, is received into a pump signal c... | 08/28/2001 |
| 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 of the input signal, is received through a pump signal po... | 07/24/2001 |
| 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 of repetition rate f0 providing a different opti... | 03/28/1995 |
| 5075573 | Low-noise optical wave amplification device The invention relates to a low-noise amplification device of an optical wave. Signal wave (Fs) to be amplified interferes with a pump wave (Fp) in such a nonlinear medium (1) as a photorefractive crystal. To reduce the noise consider... | 12/24/1991 |
| 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, carrier frequency. Devices of the invention can be included, ... | 01/08/1991 |
| 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 linear interaction is created. At least one section of this op... | 03/06/1990 |
| 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 the near infrared is accessible. The urea optical parametric... | 01/27/1987 |
| 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 values of the capacitance (Co), inductance (Lo... | 11/11/1986 |
| 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 energy delivered by a laser is that frequency in the storage ca... | 10/21/1986 |
| 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 in generating or amplifying microwaves and an inner coaxia... | 08/05/1986 |
| 4365216 | Surface-acoustic-wave device A surface-acoustic-wave device wherein a plurality of metal strips (S) are provided on a propagation path of surface acoustic wave which is formed in a laminate comprised of a piezoelectric layer (23) and a semiconductor (1), the metal strips are extended... | 12/21/1982 |
| 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 critical current Ic of the junction, is responsive ... | 04/13/1982 |
| 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 region, but not in its saturation region. With this device, th... | 01/26/1982 |
| 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 Stokes-Raman pulse enters the other end of the compressor and ... | 12/15/1981 |
| 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 an acoustic wave propagation track in a piezoelectric mediu... | 09/08/1981 |
| 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 and one or more regenerative amplifiers to increase Stokes... | 09/23/1980 |
| 4222011 | Stokes injected Raman capillary waveguide amplifier A device for producing stimulated Raman scattering of CO2 laser radiation by rotational states in a diatomic molecular gas utilizing a Stokes injection signal. The system utilizes a cryogenically cooled waveguide for extending focal interaction... | 09/09/1980 |
| 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 modulations exceeding 90 percent are demonstrated.... | 07/29/1980 |
| 4160956 | Nuclear-pumped uranyl salt laser A direct nuclear radiation pumped laser consisting essentially of a uranyl salt with a UO2++ uranyl ion enriched in the U235 isotope sufficient to sustain a fission chain reaction, the uranyl ion being directly nuclear rad... | 07/10/1979 |
| 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 condition at the upper sideband frequency, which, in combination w... | 07/03/1979 |
| 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 visible or ultraviolet photon, and the remainder of which st... | 12/05/1978 |
| 4071831 | Amplifying characteristics of a cavity-enclosed nonlinear medium A device is disclosed which is capable of amplifying optical signals. The absorptive and dispersive properties of a cavity-enclosed nonlinear medium are combined with the transmission properties of the cavity to yield an input-output characteristic curve ... | 01/31/1978 |
| 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 uranium 235-isotope separation in UF6.... | 12/13/1977 |
| 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 the conversion medium and extends over the entire frequen... | 11/15/1977 |
| 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 an unbalanced transmission line is disclosed. The diodes ... | 11/01/1977 |
| 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 modulation of the high intensity light being accomplished... | 09/20/1977 |
| 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 substantially constant impedance to the stabilizing network from l... | 06/07/1977 |
| 4012699 | Amplifying characteristics of a cavity-enclosed nonlinear medium A device is disclosed which is capable of amplifying optical signals. The absorptive and dispersive properties of a cavity-enclosed nonlinear medium are combined with the transmission properties of the cavity to yield an input-output characteristic curve ... | 03/15/1977 |
| 4011462 | Pulsed infrared difference frequency generation in CdGeAs2 The disclosure relates to a laser apparatus for generating a line-tunable pulsed infrared difference frequency output. The apparatus comprises a CO2 laser which produces a first frequency, a CO laser which produces a second frequency and a mixe... | 03/08/1977 |
| 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 current flow in the upper sideband circuit. The mechanism for i... | 11/16/1976 |
| 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 signal-to-noise ratio. While the amplifier is of general application, ... | 01/20/1976 |
| 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 reflector which can provide multiple beams, each of which can be... | 01/06/1976 |
