A simple python3 code produces a graphical representation of lasing incipience in Nd:YAG.
Created with a help of pyQT and matplotlib.
Two parameters are varied interactively: pumping power and photon lifetime in a laser cavity.
The plotted values are:
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N - instant level of inverse population
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N0 - achievable inverse population with current pump speed and no cavity
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Ncw - inverse population in case of continuous wave generation
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U - instant level of laser power
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Ucw - laser power in case of continuous wave generation