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The following question refers to the alexandrite laser (see Fig. Below). Suppose optical pumping promotes Q quanta of light per second to be absorbed

The following question refers to the alexandrite laser (see Fig. Below). Suppose optical pumping promotes Q quanta of light per second to be absorbed by Cr ions. What amount of ions are in 2E and 4T2 states at temperature 90C. 4T1 4A2 AE=800 cm 2E 4T2 n n g2=4; A2= 6x105 s g1-2; A1-600 s-

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