The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 16, 1988
Filed:
Oct. 30, 1986
Applicant:
Inventor:
Suwat Thaniyavarn, Pasadena, CA (US);
Assignee:
TRW Inc., Redondo Beach, CA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H15 / ;
U.S. Cl.
CPC ...
372 18 ; 372 19 ; 372 20 ; 372 36 ;
Abstract
A phase-locked semiconductor laser array in which the phase of oscillation of alternate laser elements is adjusted externally to the laser cavity. A phase plate having parallel ribs of tapered thickness is positioned in close proximity to the emitting facet of a laser array, and is adjusted in position until the ribs are registered with alternate laser elements, and the thickness presented to the emitted laser beams is sufficient to cause a phase change of 180 degrees. After light from the array has passed through the phase plate, the entire set of beams is in phase and produces a practically single-lobed far-field pattern.