- Tech know how online

Kerr effect

The Kerr effect is a phenomenon used in the readout of magneto-optical memories

. In the Kerr effect, suitable substances reflect polarized laser light depending on their magnetized surface, rotate it in the polarization axis and change it in ellipticity.

Both effects result from birefringence, i.e. two different refractive indices exist in the Kerr effect. The direction of rotation of the light is determined by the magnetic field, the deviation from the original position is the Kerr angle. It is between 0.5 ° and 8 ° for the materials used in magneto-optical memories. The Kerr effect is named after its discoverer Rev. John Kerr, M.A., (1824 - 1907).

Informationen zum Artikel
Englisch: Kerr effect
Updated at: 05.07.2007
#Words: 118