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