Mechanical Housing And Instrumental Apparatus

To test the SPAD arrays, a mechanical housing working under vacuum conditions while hosting the packaged detector and AQC boards has been deigned and built. Figure 1 shows the housing for the SPAD array detector and the AQC boards. To cool the detector a two stage Peltier module is used and a particularly long cold finger has been manufactured to allow the stacked assembly of four aligned AQC boards. The cryogenic system is able to operate the array detector at temperatures from -30 to 30°C.

Figure 1. Mechanical housing hosting the SPAD array detector and the AQC boards.

On the bottom are electrical connectors and the vacuum valve, while a quartz window allows photons to enter through the top. The mechanical interface has easy mounting on the three axis translator light tight box.

Each AQC board is able to drive up to four elements of the SPAD array. The main characteristics of each AQC are listed in Table 1.

Due to mechanical constraints we can accommodate up to 4 AQC boards inside the cryostat. Thus we can drive up to 16 SPADs simultaneously. The 16 outputs are TTL standard and can be read either by specialized counter boards or off-the-shelf USB data acquisition systems.

Figure 1. Mechanical housing hosting the SPAD array detector and the AQC boards.

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