Question: Bonus question: (10 points) Use two-level Einstein coefficients to show that stimulated emission can only occur when there is population inversion. Sketch two common lasing

Bonus question: (10 points) Use two-level Einstein coefficients to show that stimulated emission can only occur when there is population inversion. Sketch two common lasing schemes (Hint: use multi- levels, arrows with key labels). Why is the spin-orbit coupling needed for intersystem crossing? Bonus question: (10 points) Use two-level Einstein coefficients to show that stimulated emission can only occur when there is population inversion. Sketch two common lasing schemes (Hint: use multi- levels, arrows with key labels). Why is the spin-orbit coupling needed for intersystem crossing

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