Magneto-optic characteristic measuring apparatus

Details Magneto-optic characteristic measuring apparatus Magneto-optic characteristic measuring apparatus

1996-11-25

1998-11-17

Dinh, Tan

Optics: measuring and testing

By polarized light examination

Of surface reflection

356367, G01J 400

Patent

active

058384448

ABSTRACT:
A magneto-optic characteristic measuring device which is adapted to measure a Kerr rotation angle is a kind of magneto-optic characteristic exhibited in materials used for magneto-optic recording media. Known materials exhibiting a magnetic Kerr effect have very small Kerr rotation angle ranging from about 0.1.degree. to about 0.5.degree.. As a result, it is difficult to accurately measure such a small Kerr rotation angle using known measuring devices due to an influence caused by noise components. In the magneto-optic characteristic measuring apparatus, its electronic circuit unit, which serves to magneto-optically modulate a laser beam from an optical unit introduced in a beam splitter via a polarizer and to record the modulated beam in an X-Y recorder using a detect signal from an optical detector unit, includes a lock-in amplifier,.thereby accurately measuring a small Kerr rotation angle.

REFERENCES:
patent: 4410277 (1983-10-01), Yamamoto et al.
patent: 4816761 (1989-03-01), Josephs
patent: 4838695 (1989-06-01), Mansuripur et al.
patent: 4922200 (1990-05-01), Jackson et al.

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