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. 30, 2005
Filed:
Jan. 13, 2003
Keiji Fuse, Osaka, JP;
Keiji Fuse, Osaka, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A laser beam emitted from a laser source is split by a beam-splitting means such as a beam sampler, and the power Q of the split beam is measured by a first detector. In addition, the power qof light that has passed through a pinhole while a DOE is not set is measured by a second detector, and the power ratio α=q/Q is calculated. Then, the DOE is set and the power ratio β=q/Q, where qis the power of each light beam, is calculated. The power ratio βis evaluated on the basis of the power ratio α, so the optical properties of a diffractive optical element, in particular, in terms of diffraction efficiency in laser-beam diffraction and intensity uniformity of split beams can be measured with high accuracy.