A kind of permanent magnetic-filled cavity based on the Faraday magneto-optic effect

change of the rotation angle of the linearly polarized light passing through the magnetic cavity is studied by applying the Faraday magneto optic element in a constrained magnetic chamber and changing the structure parameters of the magnetic cavity. On the test

with the increase of the magnetic cavity radius and the decreases of the magnet blocks

the rotating angle of the polarized light is gradually decreased; with increase of distance between permanent magnet blocks

rotating angle is increased firstly and then decreased. The maximum rotating angle is 85. 1° under the condition of magnetic cavity radius of 4. 3 mm

distance of 16 mm of 6 magnetic blocks. The minimum rotating angle is 9. 8°under the condition of 9. 5 mm magnetic cavity radius

distance of 14 mm of 2 magnetic blocks.