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<p>between <a href="page.php?w=refractive_index">refractive index</a> experienced by an ordinary and extraordinary ray is proportional to the square of the <a href="page.php?w=electric_field">electric field</a>. Where the relationship is linear, the effect is known as the <a href="page.php?w=Pockels_effect">Pockels effect</a>. Intense light from <a href="page.php?w=laser">laser</a>s allows the achievement of the effect using the light's own electric field, the AC Kerr effect. Kerr also demonstrated a similar phenomenon for <a href="page.php?w=magnetic_field">magnetic field</a>s,</p><p>
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