Assignee: Avco Everett Research Laboratory, Inc.

Location: Everett, MA
No. of patents: 42

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Number	Title	Issue Date
4633103	Two cell stimulated Raman scattering frequency conversion laser A laser method of and apparatus for providing a wide variety of laser wavelenghts wherein a pump source of laser radiation is sequentially Strokes-shifted in two separate cells each containing a different molecular or atomic Raman active gas, wherein each...	12/30/1986
4620305	Gas laser and method of operation Gaseous lasers and their operation wherein during operation in the saturated regime Zeeman reorientation collisions do not occur rapidly compared to the rate at which population is transferred out of their upper lasing level and there exists a static magn...	10/28/1986
4583023	Electron beam heated thermionic cathode A preferably fully impregnated dispenser cathode member or the like forming part of an electron tube, electron beam generator or the like is initially heated by any suitable means to a temperature sufficient for low level electron emission from its rear s...	04/15/1986
4518232	Method and apparatus for optical beam shaping A method and apparatus for transforming an obscured beam into a uniform intensity pattern at the image plane of the apparatus are described. Apparatus for carrying out the invention comprises two on-axis optical elements which are designed for stigmatic i...	05/21/1985
4477332	Solubilization of carbonaceous material Pulverized carbonaceous material such as coal while flowing through a reactor dispersed in a carrier gas substantially transparent to radiant energy and at atmospheric pressure is heated, typically for a few milliseconds to about 1500° K., by thermal rad...	10/16/1984
4476374	Rotary indexing laser mirror apparatus A rotary indexing device for indexing a member, such as a shaft, into operative working positions in which the shaft carries a plurality of indexing arms for selecting different working positions. Final positioning means for each indexing arm comprising a...	10/09/1984
4468279	Method for laser melting of silicon A method for laser melting of silicon for the production of boules pulled from a pool of liquid ultraclean or ultrapure silicon wherein the boules are used for producing silicon wafers suitable for use in the electronics field. A laser beam, preferably P ...	08/28/1984
4456811	Method of and apparatus for heat treating axisymmetric surfaces with an annular laser beam This invention is directed to a method of and apparatus for heat treating axisymmetric surfaces such as inner and outer surfaces on pipes, shafts, gears, valve seats and the like with a laser beam. An annular laser beam is provided and caused to impinge o...	06/26/1984
4401726	Metal surface modification Properties of the surface of low melting substrate parts including low melting, high conductivity reactive metal parts, are modified by forming an alloy casing thereon having the metal of the substrate as a first (matrix) component thereof together with a...	08/30/1983
4396580	Fluid-dynamic means for efficaceous use of ionizing beams in treating process flows In an apparatus for treatment of a process flow by beams of ionizing radiant energy, drag elements are provided for slowing flow velocity to achieve equal treatment of all portions of the process flow....	08/02/1983
4328443	Apparatus for providing improved characteristics of a broad area electron beam An electron beam device having a vacuum chamber in which an electron beam generator generates a directed stream of electrons. An electron beam window comprising a foil which seals the vacuum chamber is in the path of the stream of electrons and permits pa...	05/04/1982
4323925	Method and apparatus for arraying image sensor modules An image sensor, suitable for resolving a high-resolution image, comprises an arrayed plurality of image sensor modules of moderate individual resolution. The high-resolution image is subdivided into contiguous sub-images, each of which is minified before...	04/06/1982
4321558	Recirculating gas laser The working parts of a flowing gas laser are enclosed within an airtight housing comprising a first plenum separated from a second plenum. Blower means comprising one or more modules is provided with gas inlet means for receiving gaseous lasing medium fro...	03/23/1982
4313739	Removal of contaminants from gases The parent gas to be purified is passed end-to-end through a porous electrically conductive cylinder or its equivalent having a small wire electrode disposed along its longitudinal axis. A voltage is applied between the cylinder and wire sufficient to pro...	02/02/1982
4289397	Laser ceilometer signal processing means For use in a pulsed-laser lidar such as a laser ceilometer, there are shown several examples of signal processing means for separating desired pulses due to targets such as clouds from strong background signals due to suspended particles causing poor visi...	09/15/1981
4283686	Laser operation with closed gas and tuned duct pulsing In a pulsed gas laser, pulses of electrical or other energy are desirably converted in part into pulses of quantum mechanical pumping of the lasable gas, and unavoidably converted in part into pulses of heating of the lasable gas. According to this invent...	08/11/1981
4278445	Subsonic-velocity entrained-bed gasification of coal A process and apparatus for gasification of carbonaceous matter, preferably coal, is disclosed. In one embodiment, a stream of previously produced char, preferably produced from coal or other fuel, together with an oxidizer and steam is introduced into a ...	07/14/1981
4278446	Very-high-velocity entrained-bed gasification of coal A process and apparatus for gasification of carbonaceous matter, preferably coal, is disclosed. A stream of previously produced char, preferably produced from coal, or other fuel together with an oxidizer and steam is introduced into a first or combustion...	07/14/1981
4264146	Folding laser mirror A laser mirror adapted to prevent astigmatism of reflected laser beams where the mirror is used for "folding" the laser beam such that the incident laser beam direction is not normal to the reflective surface of the mirror. This is accomplished by the pro...	04/28/1981
4259988	Vortex-diode check valve with flexible diaphragm A vortex-diode check valve comprises a short cylindrical working chamber with an axial inlet port entering axially through a first end wall at a short distance from the central portion of a second end wall and a tangential outlet port exiting tangentially...	04/07/1981
4258753	Fluidic switch A fluidic amplifier or switch for supplying pulses of a power gas to be controlled which is insensitive to load impedance or back pressure. One arm of the fluidic switch comprising part of the gas injection path is coupled to a working outlet and the othe...	03/31/1981
4237404	Spark gap control A high repetition rate high power spark gap switch of the type useful in pulsed lasers, radar systems and pulse-forming networks is enabled to operate with higher switching speed at high power levels by rapid chemical composition change cyclically made in...	12/02/1980
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
4211983	High energy electron beam driven laser Improved electron beam driven gas laser method and apparatus with the achievement of high single pulse energies therefore enabled by establishment of a magnetic field in a direction substantially parallel to the desired direction of electron beam propagat...	07/08/1980
4203078	Apparatus for and method of operating electron beam attachment stabilized devices for producing controlled discharges and/or visible and UV laser output Apparatus for and method of operating a laser wherein a discharge is produced preferably in a high pressure lasing gaseous mixture comprising at least one suitable first gaseous species capable of providing an excited state which has a finite probability ...	05/13/1980
4156207	Wall dominated laser discharge using turbulent ambipolar diffusion An electric discharge gas laser has a turbulence generator inserted in the flow path of the gas upstream of the optical cavity. The turbulence generator is illustrated as a screen. The turbulence is also disclosed as resulting from a vortex-causing blade ...	05/22/1979
4151486	Tunable alkali metallic vapor laser A tunable alkali metallic vapor laser system is disclosed. Stimulated Raman scattering (SRS) in a low pressure atomic alkali metallic vapor of potassium or cesium is utilized wherein the atomic vapor is provided and then primed to populate an intermediate...	04/24/1979
4123798	High density beam-accessed memory with reference target This invention relates to apparatus and methods for providing a high-density memory for electrical data and more particularly, to such a memory wherein data are represented by patterns of charge written and read by electron beam means at addressed locatio...	10/31/1978
4092405	Separation of deuterium from hydrogen Method of and apparatus for non-equilibrium chemical kinetic separation of deuterium from hydrogen are described wherein hydrogen with its normal abundance of deuterium and an appropriate reactant, bromine, are supplied to a deuterium reaction vessel wher...	05/30/1978
4079340	Unstable optical resonator with off-axis noncentered obscuration Herein described is an unstable resonator optical cavity for lasers which may have a square, rectangular or the like spherical concave primary reflection surface at one end of the cavity that intercepts the optical axis of the cavity at or adjacent to one...	03/14/1978
4065732	Energy resonating system with elimination of optical bench structure A laser comprises an optical resonant cavity construction utilizing opposing corner cube and W-fold mirrors to provide a four-pass folded optical path which is not dependent upon critical alignment between the said mirrors and therefore eliminates necessi...	12/27/1977
4061944	Electron beam window structure for broad area electron beam generators An electron beam window structure for broad area electron beam generators wherein a stream of electrons generated in an evacuated enclosure and extending over a broad area are passed through a thin window to a region of high pressure outside the enclosure...	12/06/1977
4015100	Surface modification Properties of a surface layer of a metal part are modified by changing its composition and microstructure using focused radiant energy. Minor components of an alloy having the metal of the substrate as the major component thereof are applied to the surfac...	03/29/1977
4010427	Laser output control system A method and apparatus for controlling the power of a laser beam issuing from a gaseous working medium in a working region wherein the gas is subjected to an electric field and an ionizing beam is directed to the gas, ionizing the gas and producing therei...	03/01/1977
4008444	Feedback control of a laser output In a method and apparatus for producing and controlling a beam of radiation such as a laser beam issuing from a gaseous working medium in a working region wherein the gas is subjected to an electric field and an ionizing beam is directed to the gas, ioniz...	02/15/1977
3985123	Method and means for monitoring cardiac output A cardiac output monitor. The monitor receives signals representing radial arterial pressure, balloon pressure, balloon drive and balloon volume from an intra-aortic balloon pumping system. These signals are processed to define balloon depletion pressure ...	10/12/1976
3982209	Combustion-electric laser Working gas for an electron beam discharge laser is generated by an airbreathing, hydrocarbon fuel burning, turbocompressor engine and shaft power of the engine may be utilized to drive a generator to provide electric power to the laser or to drive a comp...	09/21/1976
3982205	Method for producing a lasable gaseous mixture for use in and operation of electron beam-sustainer stabilized carbon dioxide lasers A method of producing a lasable gaseous mixture for use in and operation of electron beam-sustainer carbon dioxide lasers comprising burning a hydrocarbon fuel to produce substantially oxygen free products of combustion, removing undesirable constituents ...	09/21/1976
3982200	Electron beam gas discharge laser pressure control A two chamber electrically pumped electron beam stabilized gas discharge laser is enabled to operate at lower electron accelerating voltages for given power applications through provision of very thin separating diaphragms. The apparatus is controlled thr...	09/21/1976
3952180	Cladding A metal layer is clad to a metal substrate by laying spaced rods or wires of a cladding metal on the substrate surface and scanning the cladding metal with a continuously operating laser beam, part of which impinges directly on the cladding metal to melt ...	04/20/1976

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Assignee: Avco Everett Research Laboratory, Inc.