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. 28, 2018
Filed:
Feb. 27, 2017
Applicant:
J.a. Woollam Co., Inc., Lincoln, NE (US);
Inventors:
Assignee:
J.A. WOOLLAM CO., INC., Lincoln, NE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 5/30 (2006.01); G02B 7/00 (2006.01); G02B 17/00 (2006.01);
U.S. Cl.
CPC ...
G02B 5/3083 (2013.01); G02B 7/003 (2013.01); G02B 17/006 (2013.01);
Abstract
A substantially achromatic multiple element compensator system for use in a wide spectral range, (for example 190-1700 nm), rotating compensator spectroscopic ellipsometer or polarimeter or the like system, which does not require external surface coatings at locations whereat total internal reflections occur. Multiple total internal reflections enter retardance into an entered beam of electromagnetic radiation. Berek-type retarders on both input and output sides of the multiple elements are oriented to minimize changes in the net retardance vs. wavelength via adjustment of Berek-type retarders. Berek-type retarders.