I calculate the values of the einstein a and b coefficients, Ask an Expert

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(i) Calculate the values of the Einstein A and B coefficients for the case of a transition at l = 1.15 mm with a lifetime of 125 ns (neon gas has a transition like this).

(ii) How large would the spectral radiant energy density at this wavelength have to be to make the rate of stimulated emission be equal to the rate of spontaneous emission?

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