For example, the infrared light source 92 may be physically separated from the light source 74 by superimposing the locator beam 90 onto the light from {HEAD ~ the light source} 74 with {TAIL ~ a beam splitter} and steering optics 
For example , the infrared light source 92 may be physically separated from the light source 74 by superimposing the locator beam 90 onto the light from { HEAD ~ the light source } 74 with { TAIL ~ a beam splitter } and steering optics
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH