Patent · US Active

Reflective compact lens for magneto-optic Kerr effect metrology system

US12164093B2 · kind B2 · utility

0Cited by

16References

19Claims

0Family size

Inventors

Alex Zheng · Caohejing, CN
Jun Wang · Shanghai, CN
David Y. Wang · Houston, US
Chunxia Li · Shandong, CN
Changfei Yan · Shanghai, CN
Rui Ni · Nanhu, CN
Lansheng Dong · Shanghai, CN
Yang Zhou · Madison, US
Hai-Yang You · Shanghai, CN
Haijing Peng · Shanghai, CN
Walter H. Johnson · Salem, US
Shankar Krishnan · Santa Clara, US
Jianou Shi · State College, US

Key dates

Filing date	Oct 19, 2021
Grant date	Dec 10, 2024
Priority date	—
Expiry date	Jan 1, 2042

Classification

Technology area (CPC G)Physics
CPC primaryG01N21/9501
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A Cassegrain or quasi-Cassegrain structure objective lens is used in a polar MOKE metrology system. The quasi-Cassegrain reflective objective lens includes a primary concave mirror and a secondary mirror. The primary concave mirror has a wider diameter than the secondary mirror and defines an aperture through which the laser beam is configured to be transmitted toward the secondary mirror. The secondary mirror can be convex, concave, or have a flat surface.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.