In addition to light from the light source 74, the imaging optics 78 also receive {HEAD ~ a locator beam} 90 from {TAIL ~ an infrared light source} 92 carried by a common substrate 85 with the light source 74 
from
In addition to light from the light source 74 , the imaging optics 78 also receive { HEAD ~ a locator beam } 90 from { TAIL ~ an infrared light source } 92 carried by a common substrate 85 with the light source 74
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH