Hamamatsu Photonics has rolled out a completely updated range of multi-pixel photon counter (MPPC) detectors for applications ranging from medical physics and high-energy physics to general optical measurement applications.
The components utilise a Geiger-mode pixelated avalanche photodiode structure for ultra-low-level light detection. Each pixel contains a quenching circuit so that simultaneous photon events can be counted separately and with a high degree of accuracy.
The detectors feature typical gain values from 250 000 to several million, depending on the specific device. They also feature high photon detection efficiency from 320 nm to 900 nm. Unlike traditional photomultiplier tubes (PMT) the MPPCs can be operated at low voltage (less than 80 V) and they are insensitive to magnetic fields.
Some key areas of improvement to the upgraded devices include a greatly reduced dark count, reduced after-pulsing, increased photon detection efficiency, improvements in timing resolution and linearity as well as reduced crosstalk. The result of these and other improvements means that they now have a much improved signal-to-noise ratio, wider operating voltage range, improved time resolution and a wider dynamic range.
As well as these improvements to the product range, there are also multiple new bare and modular solutions not previously offered. For example, Hamamatsu now offers a single pixel module, effectively taking a single MPPC pixel, of 50 μm or 100 μm diameter, and housing this within a cooled module. Dark counts as low as 7 cps are easily achievable in this way.
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