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Kerr Magneto-optical Elements

IP.com Disclosure Number: IPCOM000096912D
Original Publication Date: 1962-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Pugh, EW: AUTHOR

Abstract

The device enhances magneto optical rotation by utilizing a multiple reflection Kerr effect. Polarized light 10, produced by polarizer 12 to which incident light 14 is applied, is directed to the upper surface of a first magnetic plate or thin film 16. It is reflected to the lower surface of a second magnetic plate or thin film 18, which is parallel to plate 16. The polarized light 10 is alternately reflected by plates 16 and 18. It finally impinges on analyzer 20 which permits an output light 22 to pass, depending up on the condition of the polarized light 10 at analyzer 20.

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Kerr Magneto-optical Elements

The device enhances magneto optical rotation by utilizing a multiple reflection Kerr effect. Polarized light 10, produced by polarizer 12 to which incident light 14 is applied, is directed to the upper surface of a first magnetic plate or thin film 16. It is reflected to the lower surface of a second magnetic plate or thin film 18, which is parallel to plate 16. The polarized light 10 is alternately reflected by plates 16 and 18. It finally impinges on analyzer 20 which permits an output light 22 to pass, depending up on the condition of the polarized light 10 at analyzer 20.

Analyzer 20 is oriented with respect to polarizer 12. Thus, a minimum output light 22 is produced when plates 16 and 18 are each magnetized in the general direction of propagation of the polarized light, i. e., from left to right. An output light 22 of greater intensity is produced when the plates 16 and 18 are each magnetized in a direction opposite to the general direction of the polarized light.

I(1) is the difference in transmitted light intensity between the two magnetization states for one reflection of the polarized light 10. I(n) is the difference for n reflections of the polarized light 10. Then I(n)/I(1) = C/n-1/ n/2/. C is the reflectivity of the plates 16 and 18. The maximum increase in intensity of output light 22 for a given pair of plates 16 and 18 occurs when n = -2/lnC. For permalloy plates, C is =~ 0. 6, so that the maximum intensity of the out...