Hugh Nathan Robinson

US Patent:

55284159, Jun 18, 1996

Filed:

Nov 9, 1994

Appl. No.:

8/336411

Inventors:

Daniel J. Gauthier - Durham NC
Hugh G. Robinson - Superior CO

Assignee:

Duke University - Durham NC

International Classification:

G02B 530
G02B 2728
G02F 109

US Classification:

359282

Abstract:

An optical isolator is disclosed that is particularly useful in the visible, infrared, and near-infrared portions of the electromagnetic spectrum. The rotator portion of the isolator produces a highly uniform magnetic intensity across its clear aperture. The optical isolator comprises a Faraday rotator that defines an optical axis, a respective polarizer on each end of the Faraday rotator and positioned on the optical axis, and a housing containing the Faraday rotator and the polarizers. The Faraday rotator comprises an optical rotator rod that defines the optical axis and a magnet assembly surrounding the optical rotator rod. The magnet assembly comprises eight trapezoidal cross section magnet sections arranged in a first group of four and a second group of four. The magnet sections in each group are placed adjacent one another along their respective nonparallel sides to form an overall square cross section for each group with a square cross section aperture through each group that surrounds the optical rotator rod. The first and second groups are arranged linearly adjacent to one another along the optical axis of the optical rod.

US Patent:

45969620, Jun 24, 1986

Filed:

Nov 3, 1983

Appl. No.:

6/548308

Inventors:

Hugh G. Robinson - Durham NC

Assignee:

Duke University - Durham NC

International Classification:

H01S 106
H03B 1700

US Classification:

331 3

Abstract:

An evacuated wall-coated sealed alkali atom cell for an atomic frequency standard, including a cell bulb having an inner wall subjected to cleaning by means of a bakeout step and a r. f. scrubbing step under vacuum, whereupon the inner wall is provided with a deuterated paraffin coating. An alkali atom. sup. 87 Rb and/or. sup. 85 Rb, and/or. sup. 133 Cs is sealed in the cell bulb under vacuum.