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An Ar+-ion laser has a 1-m-long resonator with 100% and 98% mirror reflectances. Other loss mechanisms...

An Ar+-ion laser has a 1-m-long resonator with 100% and 98% mirror reflectances. Other loss mechanisms are negligible. The atomic transition has the central wavelength λ0=515 nm, spontaneous emission lifetime tsp=10 ns, and the linewidth Δλ=0.003 nm. Determine the photon lifetime and the threshold population difference.

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