I want to detect photon at high quantum efficiency. I know that PMT (photo-multiplier tube) can do that, but I also want to get the frequency of the signal (like MHz accuracy). Is it possible to use stimulated emission to multiply photons (avalanche effect), and then feed them to a spectrometer or coherent heterodyne device?

I currently find nothing about this in literature. Is this idea impossible for some physics or engineering reason?

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