How can i calculate this plot (photon energy dependence of the optical gain (or loss = negative gain) of GaAs with the injected carrier density as a parameter? Show calculated plot based on this equation Given parameter: mc=0.067 me; (effective mass of electrons in conduction band) mv=0.48 me; (effective mass of holes in valence band) T2~0.5 ps; (lifetime for coherent interaction of electrons with a monochromatic field) Eg=1.43 eV; (energy band gap of GaAs) taung~3x10-9s; (recombination lifetime) 1/mr=1/mc+1/mv; ( reduced effective mass) n= 3.6: (refractive index for GaAs) How can i find this value ħω (energy of photon)- this should be ħω>Eg. How can i determine this energy? λ0 ω0 ( if i known λ0, can i get ω0? (ω=c/λ)) [ƒc(ω)-ƒv(ω)] Really I need your help. I am new for semiconductor laser. Please any one help me. Thanks!