Bill C Mccollum

US Patent:

43778640, Mar 22, 1983

Filed:

Aug 10, 1981

Appl. No.:

6/291664

Inventors:

Bill C. McCollum - Marlboro MA
Leonard J. Andrews - Wayland MA
Alexander Lempicki - Wayland MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

H01S 314

US Classification:

372 41

Abstract:

A laser medium includes an ordered perovskite crystal of the general formula: A. sub. 2 B Cr. sub. y B'. sub. 1-y X. sub. 6. A and B are alkali metal ions with the ionic radius of A greater than B. B' is an ion selected from the group consisting of Y. sup. 3+, La. sup. 3+, Gd. sup. 3+, Lu. sup. 3+, Sc. sup. 3+, Al. sup. 3+, Ga. sup. 3+, and In. sup. 3+. X is an ion selected from the group consisting of F. sup. -, Cl. sup. -, and Br. sup. -. A can be an ion selected from the group consisting of K. sup. +, Na. sup. +,Cs. sup. +, and Rb. sup. +. B can be an ion selected from the group consisting of K. sup. +-, Na. sup. +, and Li. sup. +. The chromium can be represented by Cr. sup. +3 ions. The laser media can be ordered perovskite polycrystalline compounds of the formulae: CsNaCr. sub. 01 Y. sub. 99 Cl. sub. 6 ; KLi Cr. sub. y Sc. sub. 1-y F. sub.

US Patent:

42297133, Oct 21, 1980

Filed:

Dec 14, 1978

Appl. No.:

5/970054

Inventors:

Bill C. McCollum - Marlborough MA
Alexander Lempicki - Wayland MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

H01S 314

US Classification:

331 945F

Abstract:

A high gain stoichiometric neodymium laser medium of the general formula K. sub. 5 Nd. sub. x M. sub. (1-x) Li. sub. 2 F. sub. 10 where x takes on a non-zero positive value less than or equal to one, and M is a metal selected from the group consisting of lanthanum, cerium, and gadolinium. Minilasers employing a laser medium of the general formula K. sub. 5 Nd. sub. x M. sub. (1-x) Li. sub. 2 F. sub. 10 are provided in which the optical pumping is provided by at least one light emitting diode or laser diode.

US Patent:

48262889, May 2, 1989

Filed:

Apr 9, 1987

Appl. No.:

7/036505

Inventors:

Robert J. Mansfield - Stow MA
Bill C. McCollum - Marlborough MA
Richard P. Tumminelli - Ashland MA

Assignee:

Polaroid Corporation, Patent Department - Cambridge MA

International Classification:

G02B 616
C03B 37018

US Classification:

350320

Abstract:

A chemical vapor deposition method which utilizes a rare earth chelate vapor as a source of rare earth ions for producing an optical fiber having a core with a high rare earth content.

US Patent:

46480943, Mar 3, 1987

Filed:

Jun 26, 1986

Appl. No.:

6/879833

Inventors:

Bill C. McCollum - Marlborough MA
Peter T. Kenyon - New Bedford MA
Leonard J. Andrews - Wayland MA

Assignee:

GTE Laboratories Incorporated - Waltham MA

International Classification:

H01S 316

US Classification:

372 41

Abstract:

A laser medium containing a chromium (3+) doped germanate garnet represented by the general formula: Ca. sub. 3 M. sub. 2(1-x) Cr. sub. 2x (GeO. sub. 4). sub. 3 wherein M is Al. sup. 3+, Ga. sup. 3+, Sc. sup. 3+, Lu. sup. 3+, or Y. sup. 3+ and 0