* At lasing threshold, - the combination of the electron and photon rate equations in the steady-state.
{"Image DocumentName": "At lasing threshold,- the combination of the electron and photon rate equations in the steady-state.", "Image ImageDescription": "condition (dn/dt = 0, dF/dt = 0) gives. - the first term is the number of photons resulting from stimulated emission. - the second term gives the spontaneously generated photons.   The external differential quantum efficiency. - the number of photons emitted per radiative electron-hole pair recombination. above threshold. - hi is the internal quantum efficiency (not a well-defined quantity ~ at. room temperature) - also calculated from the straight-line portion of P vs I curve.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}