Abstract
A high-speed and a high-sensitive laser scanning magneto-optical (MO) imaging system have been developed. In the high-speed imaging mode, we have succeeded in almost the real time observation of MO images with the sensitivity better than 100 μT. On the other hand, in the high-sensitive mode using an acoustic-optic modulator and a RF lock-in amplifier, it was found that the system noise reduced into the magnetic field strength was less than 6 μT at the data acquisition time of 10 μs. In this mode we have also succeeded in the fast MO imaging of the magnetic flux penetration into a square-shaped YBa2Cu3O7-δ n film at ∼0.3 s/frame for 128x128 and ∼5 s/frame for 500x500 pixels' image.
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