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Links to Detectors and photon counters are provided as a convenience. Marina Photonics has confidence that the end user can discern fact from specs spin.  Marina Photonics specializes in sustained Gigahertz Photon Counting that is Affordable!

Many 'Photon Counters' are just detectors with an amplifier-discriminator and TTL pulse out and don't 'count' at all.  TTL pulse output is usually 20ns or more dead time.Time Correlated Single Photon Counters are either boards for computers, NIM (Nuclear Instrumentation Modules) for NIM bins, USB units, or Stand-Alone systems.  

Please note throughput as opposed to instantaneous count rate, and bin size as opposed to time resolution.   Beware of After-Pulse detector rates which have long dead times.