| 摘要 |
PURPOSE:To simplify adjustment work at the time of measurement and to shorten a measuring time, by arranging a half mirror between a laser oscillator and a polarizer and taking out compensation light for differential amplification. CONSTITUTION:A part of laser beam from an oscillator 1 is taken out by a half mirror 21 and quantity of beam is set by an analyzer 22 to be detected by a photodiode and the output thereof is supplied to a differential amplifier 12. The transmitted beam of the mirror 21 is linearily polarized by a polarizer 2 and converged by an objective lens 5 through mirrors 3, 4 to irradiate a specimen 14 magnetized by an exciting coil 13. The return beam from the specimen 14 is converted to voltage by a photodiode 10 through an analyzer 8 to be supplied to an amplifier 12. By this method, the variation in the intensity of laser beam of the oscillator 11 is absorbed.
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