Magneto Optic Effects and Applications
Final rept. 1 Apr-5 Dec 80
AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH
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Principles of the different magneto-optic effects are reviewed. Reflection and absorption mode devices using magneto-optic effects seem to be too small to be of interest. However, transmission mode devices--such as Faraday and Voigt effects--have received a great deal of attention in the past. The main applications reported dealt with low intensity radiation. Garnets, being so versatile and having such good magneto-optic properties, certainly are worth investigating in greater depth. However, the most likely starting materials for the near infrared are the basic YIG and GdIG with some Bi or other substitution. Ferrimagnetic ordering of garnets is a great advantage for a control system as it is field and temperature sensitive. Another promising material group is the antiferromagnetic transition metal oxides. The switching properties of these materials are not directly field controlled but are dependent on internal stresses and on temperature. More information is needed as to their optical properties in the spectral range of interest. Cermets are discussed as to their possible advantage as switching elements and appears to be a virgin field regarding magneto-optic effects.
- Electricity and Magnetism