Scanning Pulsed Laser Imaging of Current-Biased MgB2 Detector

A superconducting MgB2 meander detector on a sapphire plate has been proved to work as a neutron detector in our preceding works. The 10B-enriched MgB2 detector utilizes a voltage change induced by a hot-spot arising from the nuclear reaction energy. To understand the position-dependent sensitivity of a 3-km MgB2 stripline of length 100 km, a scanning laser spot can be achieved by the combination of the XYZ piezo-driven stages and an optical fiber with an aspheric focusing lens. Our results show that the MgB2 superconducting stripline can be seen in the image of the scanning laser microscope of the signal voltage.