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The MgB 2 detector consists of 200 nm thick MgB 2 thin film meander structure of 3 µm line width protected by 300 nm thick SiO layer. The electrical connections were provided by 150 nm thick Nb. The devices were placed in a 4 K refrigerator to investigate the behavior at temperatures below T c . The position-dependent response of the MgB 2 detector can be investigated by scanning a laser spot with the T. Ishida ( ) · I448 J Low Temp Phys (2012) 167:447-454 aid of the XY Z piezo-driven stage and an optical fiber with a focusing lens. We found that the inhomogeneity in a detector is very critical to specify the detection efficiency since the detector has the sensitivity only in a narrow temperature regime near T c .