Physical Sciences, Inc.

Anthony N Pirri

Michael B Frish

Byron D Green

Peter E Nebolsine

George E Caledonia

Robert H Krech

Method and apparatus for generating a nearly mono-energetic beam of atoms at velocities on the order of several km/sec (energies of 1-10 eV) and for achieving modification of the surface properties of a target by the beam, including surface erosion, reaction with the beam species, cleaning and coating, all over a large area. A gas or gas mixture is forced through a nozzle throat into a previously evacuated expansion nozzle resulting in the acceleration of the gas in a confined flow. Laser radiation is applied to the gas flow to cause breakdown and dissociation of the gas into an atomic plasma. The plasma is allowed to expand within the nozzle cone reaching a high velocity in the desired range. The beam is generated within a vacuum chamber to maintain the purity of the gas components and prevent collisional effects. The beam is used to modify the properties of a target material placed in the path of its flow and its atoms may react with surface components to form a molecular coating. By applying the gas in pulses, controlled thin layering, even to the extent of a single atom thickness, is possible.

Source of high flux energetic atoms

A coated substrate manufactured by applying a layer of a material to the substrate and generating thermal and pressure waves in the layer by exposing the layer to high intensity, short duration laser radiation, and the process of manufacturing such a coated substrate. The laser radiation is applied in an intensity range that creates an instantaneous surface vaporization of the layer material that in turn drives a pressure wave into the layer. The pressure wave interacts with the layer-substrate interface to create bonding between them of varying strengths and qualities depending on the intensity and duration of the initial laser pulse. A thermal wave is created in some regimes of operation, or results from compressional heating of the layer by the pressure wave, and is of sufficient energy to contribute to the bonding at the interface. The coating and the process for its creation has application in diverse areas where surface properties of a particular color, hardness, corrosion resistance, abrasion resistance, electrical conductivity, among others are desired.

Growing community of inventors

Andover, MA, United States of America

Anthony N Pirri