The τ-SPAD photon counting module combines Laser Components' ultra-low noise VLoK silicon avalanche photodiode with specially developed quenching electronics from PicoQuant (patent pending). It features an extremely high photon detection efficiency of typically 70 % at 670 nm and can be used to detect single photons over the 400 nm to 1100 nm wavelength range.

The τ-SPAD generates a NIM and a TTL output pulse per detected photon and can therefore be directly interfaced with e.g. TCSPC electronics such as the PicoHarp 300 or HydraHarp 400. The photon timing response can be as short as 350 ps (FWHM, depending on module, wavelength and signal rate).

The τ-SPAD can be supplied with an easy to use FC/PC connection for optical fibers or as a free-beam module. The low dark counts and high quantum efficiency make it an ideal detector for single molecule applications, like Fluorescence Correlation Spectroscopy (FCS) or Fluorescence Lifetime Imaging (FLIM).