Broadband photo pumping of ions, as from a flash lamp or other broadband source of {HEAD ~ photons}, to create a population inversion is highly inefficient because {TAIL ~ only a small fraction} of the energy emanates within the very narrow range of wavelengths near the resonant absorption frequency of the transition 
Broadband photo pumping of ions , as from a flash lamp or other broadband source of { HEAD ~ photons } , to create a population inversion is highly inefficient because { TAIL ~ only a small fraction } of the energy emanates within the very narrow range of wavelengths near the resonant absorption frequency of the transition
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH