PURPOSE: To measure and evaluate magnetooptic characteristics or the like accurately in a microscopic manner by setting a magnetic field generator for exciting photomagnetic memory elements at the position so arranged not to affect a focusing optical device while using a laser flux and further, arranging the detection of polarized condition of a reflected laser light and the like.
CONSTITUTION: A high-resolution polarized laser flux with a fine diameter of 1μm or the like from a laser light source 13 via a polarizer 15 irradiates a disc 21 via a focusing optical system 19 provided with an actuator for focalization and tracks in noway affected by a magnet 20 for exciting the photomagnetic disc 21 provided at a specified isolated position. Therefore, a reflected light from the disc 21 accurately corresponds to the reflectance of the disc 21. The reflected light is made incident upon a measuring system 28 with a Faraday element 24 for measuring Kerr effect, a light detecting element 25, a photodetector 27 and the like for the purpose of measuring the temperature dependent property and then into a photodetector 26 not via the light detecting element 25. Thus, magnetooptic characteristics such as the reflectance and reflectance distribution of the disc 21 can be measured and evaluated accurately in a microscopic manner.
KATAYAMA HIROYUKI
TAKAHASHI AKIRA
DEGUCHI TOSHIHISA
YAMAOKA HIDEYOSHI
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