A compact confocal single-mode optical fibre scanning microscope for i
maging magnetic domain structures, based on the polar magneto-optic Ke
rr effect, has been developed. The images obtained correspond to those
obtained using single mirror scanning but this design offers a more c
ompact structure and can be made more immune from system depolarizatio
n which makes two-axis mirror scanning difficult to implement when ver
y small changes in polarization need to be detected.