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MarkNormand99

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- Homework Statement
- The upper lasing transition of neon in a helium-neon laser has a spontaneous

radiative decay to the lower laser level with a transition probability of 3.39 × 10^7

s^−1

Determine the gain coefficient at line centre if the density of the upper lasing state for the helium neon laser is 10^18 m−3.

Assume the lower states population is negligible

- Relevant Equations
- There were no relevant equations given in the question

I have found the value for the full width at half maximum line profile width , I know the the density of the upper lasing state for the helium neon laser is 10^18 m−3, and I am assuming I have to use dN_2/dt = -A_21N_2, which I can turn into N_2(t)=N_2(t=0)exp(-A_21*t), and I have calculated the mean lifetime of the state to be t=1/A_21. I`m not too sure where i should go on from here, any advice would be appreciated, thanks.