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We want to make a laser at ħω=Ec-Ev. Assume that the mirror reflectivity is [(n-1)^2] / [(n+1)^2] , where n=3.5 is the refractive index of InGaAsP, the internal loss of the laser cavity is very small, and the confinement factor is 0.02 (the power of lasing field in the QW divided by the total power in the laser cavity), calculate the threshold gain of QW in order for the laser to lase. Ec - Ev is 1.3636 eV

thank you!