On the other hand, where a laser diode of appropriate frequency emanates narrow band radiation at {HEAD ~ the absorption frequency} of {TAIL ~ the transition}, the stimulation is much more efficient 
of
On the other hand , where a laser diode of appropriate frequency emanates narrow band radiation at { HEAD ~ the absorption frequency } of { TAIL ~ the transition } , the stimulation is much more efficient
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH