https://www.cnblogs.com/sunny-li/p/8378517.html

In general, photon arrival obeys Poisson distribution. However, when
photon arrival rate is high, Poisson distribution can be approximated to Gaussian distribution.
也就是说当通光量高时,空间各个地方上光子的入射率都比较高,泊松分布可以近似为高斯分布。

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