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Solid state photon counters for scanned image acquisition: thermal and electronic saturation effects

Solid state photon counters (SSPC), because of their small active area and high quantum efficiency, can offer a high quality, cost effective choice for scanned image acquisition. The speed and dynamic range of SSPCs show both thermal and electronic limitations. We present a series of experiments which separately examine the thermal and electronic saturation effects. We discuss several approaches to the thermal loading problem, demonstrate count rates of over 107 counts/sec, and describe design considerations necessary for attaining rates of 108 counts/sec.