The optical device 11, wherein the surface area of the used part is no more than one third of {HEAD ~ the total surface area} of {TAIL ~ the spatial light modulating element} 
of
The optical device 11 , wherein the surface area of the used part is no more than one third of { HEAD ~ the total surface area } of { TAIL ~ the spatial light modulating element }
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 HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL