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The Photon counter is based on the ten year technology of Marina Photonics photon counting with custom interface for USB output.  It was constructed with a Hamamatsu Hybrid PMT using a doubled YAG 532 nm pulsed nanosecond laser at 8 KHz.  
The prototype photon counter has 1 ns range bins.  Additional units can be constructed using the Commercial Marina Photonics Photon counters for a total cost of about $25,000, which is one fifth the cost of competitive lidars.

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