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It is known that the lifetime of the upper laser level of the KCL:Li crystal with FA(II) color centers is inversely proportional to temperature

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It is known that the lifetime of the upper laser level of the KCL:Li crystal with FA(II) color centers is inversely proportional to temperature and is equal to 150 ns @77K and 5.2ns @300K. Calculate by what factor the threshold power density, necessary for full population inversion, will be increased when you increase temperature of the crystal from 77K to 300K.

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