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Magneto Optic Effect by Double Interaction

IP.com Disclosure Number: IPCOM000073955D
Original Publication Date: 1971-Feb-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Grimm, MA: AUTHOR

Abstract

Shown are two embodiments of a magneto-optic transducer which achieves double interaction between a single polarized light beam and a single point on a magneto-optic film. It is known that a linearly polarized light beam will be rotated as a result of its interaction with magnetization in a magneto-optic film. The rotation is very small and is in accordance with the known Faraday and Kerr Effects. The Kerr Effect identifies the magneto-optic interaction when the light reflects off a magneto-optic film. The Faraday Effect identifies the magneto-optic effect when the polarized light beam passes through the magneto-optic film.

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Magneto Optic Effect by Double Interaction

Shown are two embodiments of a magneto-optic transducer which achieves double interaction between a single polarized light beam and a single point on a magneto-optic film. It is known that a linearly polarized light beam will be rotated as a result of its interaction with magnetization in a magneto-optic film. The rotation is very small and is in accordance with the known Faraday and Kerr Effects. The Kerr Effect identifies the magneto-optic interaction when the light reflects off a magneto-optic film. The Faraday Effect identifies the magneto-optic effect when the polarized light beam passes through the magneto-optic film.

In drawing A, the transducer consists of two transparent, irregular-shaped prisms 10 and 12 which are mounted so that an air gap 14 is placed between the two prisms. This air gap runs at an angle to the bottom of the transducer where the magneto-optic film 16 is positioned.

In operation, the linearly polarized light beam 18 enters at the top of the transducer, is reflected off of the air gap 14, and directed to the side wall 20 of prism 10. The light beam is reflected off wail 20 n the prism 10 and back to the air gap 14. At this point, light beam 18, however, is directed normal to the air gap and will not be totally internally reflected at the air gap. Thus, the light beam 18 passes to the bottom of the transducer which is the bottom of prism 11. The light beam then reflects off of the bottom of prism 12 and during this reflection interacts magneto-optically with magneto-optic film 16 in accordance with the Kerr Effect.

The plane of polarization light beam 18a is now slightly rotated from that of the original light beam 18....