James P Wittke900 Hollinshead Spring Rd, Montgomery, NJ 08558

4332999, Jun 1, 1982

Oct 9, 1980

6/195645

James P. Wittke - Princeton NJ

RCA Corporation - New York NY

B23K 2700

219121LJ

A method for machining a workpiece with a beam of radiant energy in the presence of a chemically-reactive gas characterized in that (a) the beam heats the area of incidence of the workpiece to a reaction temperature that is below the melting point of the workpiece material and (b) the chemical reaction is exothermic and produces a reaction product having a boiling point that is below the reaction temperature of the workpiece material. The gas is preferably a halogen or nonmetallic halide which reacts with the workpiece material to produce a metal halide.

4659170, Apr 21, 1987

Jul 29, 1983

6/518732

James P. Wittke - Princeton NJ

RCA Corporation - Princeton NJ

G02B 522

350 11

Yttrium aluminum garnet is employed as a light-transmissive window for electro-optic device packages. This material is resistant to high amounts of atomic radiation.

4341472, Jul 27, 1982

Sep 15, 1980

6/187158

Istvan Gorog - Princeton NJ
Marvin A. Leedom - Princeton NJ
James P. Wittke - Princeton NJ

RCA Corporation - New York NY

G01B 1100

356399

A technique for positioning a body having a tapered profile when viewed along a first axis comprises exposing the body to a first beam of light oriented along the first axis in a manner such that the tapered profile is projected as a first image onto a first linear array of photodectors disposed along a direction orthogonal to both the first axis and the direction of the taper. The body is exposed to a second beam of light oriented along a second axis orthogonal to the first axis in a manner such that a second profile of the body is projected as a second image onto a second linear array of photodetectors disposed along a direction parallel to the first axis. The body is then moved along the first and the second axes until the first and the second images strike predetermined locations along the first and second photodetector arrays. The location of the body is also changed along a third axis, orthogonal to the first and the second axes, until the width of the first image equals a predetermined width measured by the linear magnitude of the first image along the first photodetector array.

4100508, Jul 11, 1978

Feb 22, 1977

5/770512

James Pleister Wittke - Princeton NJ

RCA Corporation - New York NY

H01S 319

331 945H

A semiconductor laser having opposed end surfaces with an optical reflective means on the surface of at least one end surface has fundamental lateral mode selectivity. The laser has an optical waveguide that extends from one end surface to the other. The optical reflective means may be an electrical insulation layer on the end surface with a reflective stripe on the insulation layer and having a width in the lateral direction less than that of the spatial width of the fundamental lateral mode in the absence of the reflective stripe. Alternatively, the selectivity means can be an antireflection layer on the end surface with a stripe opening in the antireflection layer having a width in the lateral direction less than that of the spatial width of the fundamental lateral mode in the absence of the antireflection layer. The opening in the antireflection layer is formed by placing a wire close to the end surface and evaporating the antireflection material onto the end surface. The wire prevents the material from being deposited onto the end surface under the wire thereby forming the opening.

4090777, May 23, 1978

Oct 13, 1976

5/732069

James Pleister Wittke - Princeton NJ

RCA Corporation - New York NY

G02B 514
B29D 1100

350 9615

This invention relates to a method of aligning the core of a thin optical fiber with a light emitting optical device. Prior to alignment a thin, continuous high index of refraction layer is formed on a stripped end segment of the optical fiber. The layer is formed by applying a solution of a volatile solvent and high index of refraction polymer to the stripped segment and evaporating the solvent before beading of the polymer solution occurs. The core of the fiber can then be aligned with the light emitting optical device by observing light exit the optical fiber.