Leo Frank Johnson

US Patent:

43212824, Mar 23, 1982

Filed:

Feb 6, 1981

Appl. No.:

6/232154

Inventors:

Leo F. Johnson - Bedminster NJ

Assignee:

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

International Classification:

G21K 300
B05D 306

US Classification:

427 38

Abstract:

A method is described for increasing the spatial frequency of surface relief structures. Periods as small as 750 Angstroms have been made.

US Patent:

44604343, Jul 17, 1984

Filed:

Apr 26, 1983

Appl. No.:

6/487113

Inventors:

Leo F. Johnson - Bedminster NJ
Dawon Kahng - Bridgewater Township, Somerset County NJ

Assignee:

AT&T Bell Laboratories - Murray Hill NJ

International Classification:

H01L 21306
B44C 122
C03C 1500
C03C 2506

US Classification:

156643

Abstract:

A method of planarizing a surface using ion beam milling at a non-normal angle of incidence that is useful in semiconductor device manufacture is described.

US Patent:

42458838, Jan 20, 1981

Filed:

Dec 26, 1978

Appl. No.:

5/973162

Inventors:

Leo F. Johnson - Bedminster NJ
Shobha Singh - Summit NJ
LeGrand G. Van Uitert - Morris Township, Morris County NJ

Assignee:

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

International Classification:

G02B 514
G09F 900
G02F 101

US Classification:

350 9614

Abstract:

Electrically activated components such as switches, modulators, attenuators, and mode selectors are disclosed which can be used in networks of waveguides in optical communications systems. Disclosed components comprise an electrochromic medium in combination with a suitable ion source and means for producing a variable electric field across the medium. A change of color in the medium in response to variation of the electric field strength is instrumental in influencing direction and intensity of light propagating in a network.

US Patent:

43726410, Feb 8, 1983

Filed:

Jun 27, 1980

Appl. No.:

6/163789

Inventors:

Leo F. Johnson - Bedminster NJ
LeGrand G. Van Uitert - Morris Township, Morris County NJ

Assignee:

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

International Classification:

G02B 514

US Classification:

350 9612

Abstract:

Optical communications networks may be implemented by means of a patterned layer of an optically transparent material on a substrate. Where an optical path terminates, e. g. , at an on-off switch, it is desirable to optically terminate a waveguide so as to minimize spurious signals due to reflection. The invention provides for optical termination of a waveguide by essentially complete absorption of light. Absorption is effected in a portion of the waveguide which comprises light absorbing centers such as, e. g. , carbon or metal particles, anions, cations, or molecules which absorb light at desired wavelengths. Absorbing centers may be comprised in a central portion of a waveguide or, more conveniently, in a portion adjacent to a central portion. In the interest of minimizing reflections, interaction between light and absorbing centers increases gradually in a direction of light propagation as may be due to gradually increasing concentration of absorbing centers or to taper in a waveguide cladding portion, core portion, or absorbing portion.

US Patent:

54886244, Jan 30, 1996

Filed:

Feb 8, 1994

Appl. No.:

8/195790

Inventors:

Robert J. Thrash - St. Charles IL
Leo F. Johnson - Bedminster NJ

Assignee:

Amoco Corporation - Chicago IL

International Classification:

H01S 316

US Classification:

372 41

Abstract:

An upconversion laser system that uses solid state components throughout and achieves such operation with a substantially coherent, continuous or quasi-continuous single band infrared pumping source using successive energy transfers between the sensitizer and activator in the host of the lasant upconversion material.

US Patent:

52992152, Mar 29, 1994

Filed:

Sep 25, 1991

Appl. No.:

7/765381

Inventors:

Robert J. Thrash - St. Charles IL
Leo F. Johnson - Bedminster NJ

Assignee:

Amoco Corporation - Chicago IL

International Classification:

H01S 316

US Classification:

372 41

Abstract:

An upconversion laser system that uses solid state components throughout and achieves such operation with a continuous or quasi-continuous single band infrared pumping source using successive energy transfers between the sensitizer and activator in the host of the lasant upconversion material.

US Patent:

42411092, Dec 23, 1980

Filed:

Apr 30, 1979

Appl. No.:

6/034591

Inventors:

Leo F. Johnson - Bedminster NJ

Assignee:

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

International Classification:

B05D 506

US Classification:

427162

Abstract:

An oblique shadow deposition technique for altering the profile of grating relief patterns on surfaces is described. In one aspect the technique essentially represents a method whereby a series of grating masks may be superimposed in precise registration with each other. By appropriate choice of deposition angle, deep grooves may be generated from shallow profiles, rounded or sinusoidal profiles may be transformed to structures with planar vertical walls, and symmetric profiles may be made asymmetric.

US Patent:

42406935, Dec 23, 1980

Filed:

Dec 26, 1978

Appl. No.:

5/973188

Inventors:

Leo F. Johnson - Bedminster NJ
Shobha Singh - Summit NJ
LeGrand G. Van Uitert - Morris Township, Morris County NJ

Assignee:

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

International Classification:

G02B 514
G09F 900
G02F 129

US Classification:

350 9614

Abstract:

Electrically activated optical switches, couplers, and modulators are disclosed which can be incorporated in waveguide networks in optical communications systems. Disclosed devices comprise an electroplating medium in combination with a suitable source of an electric field whose strength can be varied to cause transition of the electroplating medium between plated and unplated states. Changes of reflectivity and refractive index are the bases of switching and coupling applications, respectively.