I’m trying to create & analysis a photonic crystal laser in FDTD. a clear related example(QD laser) is in the kb. in that example a 4 level 2 electron material used for active medium of laser and pumped at 1430nm with proper CW source. I have 2 main problems when i create similar structure with different pumping(532nm) and lasing(566nm) wavelengths:
1-in 4 level 2 electron system desired lasing frequency not reached( despite carefully set the omega a and omega b coefficients), what is the correct coefficients for pump at 532nm and lase in 566nm?
2- I dont know how could i plot optical gain of a laser & acquire threshold energy in FDTD