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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 4605869 | Polyacetylenic compositions This invention provides a novel class of polyacetylenic compositions. Illustrative of the invention is a liquid crystalline polymer characterized by the repeating unit: ##STR1## In the form of an optically transparent substrate, the polymer exhibits ... | 08/12/1986 |
| 4525843 | Ring laser with wavefront conjugating beams An improvement for a ring laser gyro employs insertion of a wavefront conjugating coupling element inside a laser cavity to reduce the lock-in threshold and to reduce the imbalance between the amplitudes of the opposite direction traveling waves (ODTW) in... | 06/25/1985 |
| 4518934 | Optical bistable device An optically integrated bistable device includes a semiconductor junction Fabry-Perot interferometer cavity and a pair of electrodes for applying a reverse-bias voltage to the junction to increase its light absorption. A capacitor is connected between one... | 05/21/1985 |
| 4500855 | Phase conjugation using internal reflection An apparatus and method of producing a phase conjugate replica of a light beam involves internal reflection of the beam within a body of mixing material which lacks inversion symmetry. The orientation of the body relative to the incoming beam is adjusted ... | 02/19/1985 |
| 4493086 | Synchronously-pumped phase-conjugate laser Laser apparatus is disclosed which employs the principles of phase conjugation to provide for short-pulse operation. A phase-conjugate reflector, lasing medium, and output coupling device are arranged to form a laser resonator. The lasing medium may be pu... | 01/08/1985 |
| 4429393 | Double phase-conjugate ring resonator Apparatus for providing an amplified, phase-conjugated output beam. A nonlinear medium, gain medium, and output device are disposed along an optical path to form a ring resonator. An external laser source provides laser light to one end of the nonlinear m... | 01/31/1984 |
| 4413342 | Method and apparatus for frequency doubling a laser beam A method and apparatus for providing coincident orthogonally-polarized laser beams having twice the frequency of a fundamental frequency emitted by a laser source is disclosed. A second harmonic generator within a laser resonator cavity causes frequency-d... | 11/01/1983 |
| 4408329 | Laser device with intraresonator harmonic generator A laser device for generating frequency-doubled laser pulses at maximum eciency. A laser rod is optically pumped to radiate unpolarized light at 1.064μ wavelength for transmission within a ring-type resonator defined by a flat mirror and a turning prism... | 10/04/1983 |
| 4390991 | Adaptive laser output coupler An output coupler for a high power laser employs the nonlinear effect of the 4-wave mixing process. The coupler adapts so that the coupling efficiency is dependent on the amplitude of the circulating fields within the optical cavity.... | 06/28/1983 |
| 4349907 | Broadly tunable picosecond IR source A picosecond traveling-wave parametric device capable of controlled spectral bandwidth and wavelength in the infrared is reported. Intense 1.064 μm picosecond pulses (1) pass through a 4.5 cm long LiNbO3 optical parametric oscillator crystal (... | 09/14/1982 |
| 4344042 | Self-regenerative laser oscillator-amplifier Apparatus is provided which includes a laser oscillator for providing light along a first optical path, and a laser amplifier for amplifying light along a second optical path. Means for coupling light between the first and second optical paths is disposed... | 08/10/1982 |
| 4327337 | Intracavity raman frequency conversion in a high power laser A gaseous Raman conversion medium is placed inside a laser resonant cavity to generate tunable laser radiation in the visible, near infrared and far infrared spectral ranges with an improved conversion efficiency and a higher power output. The combination... | 04/27/1982 |
| 4250465 | Radiation beam deflection system Apparatus for deflecting a beam of electromagnetic radiation controllably such that the beam can be used for scanning and other purposes. In this invention, the output beam of the apparatus is deflected by a dispersion element such as a diffraction gratin... | 02/10/1981 |
| 4233571 | Laser having a nonlinear phase conjugating reflector A laser which self-corrects for distortions introduced into the laser beam wavefronts by aberrations and time-varying phenomena internal to the laser. The improved laser includes a partially transmissive first reflecting element, an aperture stop, a lasin... | 11/11/1980 |
| 4233569 | High power laser with tuning and line narrowing capability The cavity of a high power laser is selectively tuned to oscillate in a relatively narrow spectral region by placing inside the cavity a birefringent KD*P filter at the Brewster angle. The degree of phase retardation introduced by the filter is controlled... | 11/11/1980 |
| 4229708 | X-ray laser This invention is directed towards a scalable X-ray laser comprising means for providing an active medium of lithium-like atoms or ions, means for producing in the active medium a population of low density ions in an excited intermediate metastable state ... | 10/21/1980 |
| 4221472 | Nonlinear optical apparatus using fabry-perot resonators An optical apparatus which provides a nonlinear characteristic between input and output amplitude levels is disclosed. A single frequency linearly polarized single mode light beam having amplitude variations that are to be acted upon is coupled to a Fabry... | 09/09/1980 |
| 4220928 | Adaptive correction of linear phase aberrations in laser amplifier systems Linear phase aberrations in laser amplifier systems are adaptively corrected by a device which propagates an object beam formed by reflection of a laser beam from a target backwards through a laser amplifier chain in order to sample the linear phase aberr... | 09/02/1980 |
| 4198675 | Linearization technique for closed-loop acousto-optic modulators Linearization of a closed-loop acousto-optic modulation system is maintained over a uniform closed-loop bandwidth that is independent of the output light intensity level through the use of a compensating square-root function generator which employs the th... | 04/15/1980 |
| 4181899 | High power optical second harmonic generation in non-linear crystals Harmonic generation in a nonlinear crystal, arising out of high power optical energy produced by a neodymium-doped glass laser operating at 1.06 micrometers wavelength, is normally limited by crystal self-heating due to thermal-optical effects that cause ... | 01/01/1980 |
| 4144464 | Device and method for noresonantly Raman shifting ultraviolet radiation A device and method for nonresonantly Raman shifting broad band uv excimer laser radiation, which enhances preselected Stokes signals by varying the pressure of the Raman scattering medium, the focal interaction length of the incident radiation within the... | 03/13/1979 |
| 4061921 | Infrared laser system An infrared laser system and method for isotope separation may comprise a molecular gas laser oscillator to produce a laser beam at a first wavelength, Raman spin flip means for shifting the laser to a second wavelength, a molecular gas laser amplifier to... | 12/06/1977 |
| 3999144 | Process for eliminating small-scale intensity fluctuations of laser beams A method for eliminating small-scale, spatial intensity fluctuations in laser beams is disclosed comprising the steps of placing in the path of the laser beam at least one nonlinear filtering element constituted by a fluid medium, having an index of refra... | 12/21/1976 |
