Electrooptic (EO) and Magnetooptic (MO) effects concern index changes and optical phase changes in a medium induced by the application of electric or magnet fields. A continuing area of work is the design of devices which take advantage of these special properties. For example, ellipsometric techniques (1) have been developed to measure small phase shifts arising from optical reflection from magnetic materials for the purpose of evaluating magnetic films. In addition, electro-optic Lyot filters have been developed as the central sensing mechanism for commercial detectors measuring optical absorption of gases.
- U.S. Patent No. 4,866,264 – Method and apparatus for measuring non-reciprocal loss of thin magnetic films and magnetic mirrors