The PDM series of photon counting detector modules are all solid-state instruments. They have a photon detection efficiency of 49% at 550nm and generate a TTL output pulse per detected photon. With the fast-timing option (additional circuit board installed), they provide better than 50ps FWHM photon timing resolution.
The excellent photon detection efficiency and superior timing resolution is obtained through the use of epitaxial silicon Single Photon Avalanche Diodes (SPAD) and patented integrated Active Quenching Circuits (iAQC), specifically designed and optimised for photon counting applications.
Low-noise SPADs and low-power iAQCs make these modules ideal for portable equipment and all applications requiring low power consumption.