A time-to-digital converter for photon counting

11th May 2015
Posted By : Siobhan O'Gorman
A time-to-digital converter for photon counting

A counter which records the timestamps of electrical signals has been introduced by LASER COMPONENTS. Suitable for time-correlated single photon counting, the quTAU transmits the time an event occurs and the count rates of eight individual input channels via USB to a PC. The device exhibits a temporal resolution of 81/s.

The arrival times of the TTL incoming pulses are stored digitally and can be transferred to a PC using the USB 2.0. The quTAU not only counts and stores individual events but coincidences between two or more channels as well. The coincidence time window can be easily set by the user. These features have been designed with applications such as quantum optics, fluorescence microscopy and high-energy physics in mind.

The system comes with example software for LabViewTM and C/C++ and can be operated on Windows and Linux PCs.


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