{HEAD ~ The first aspheric collimating lens} comprises {TAIL ~ a first lens surface} and a second lens surface, wherein the first lens surface denotes the surface that the incident beam impinges on 
comprises
{ HEAD ~ The first aspheric collimating lens } comprises { TAIL ~ a first lens surface } and a second lens surface , wherein the first lens surface denotes the surface that the incident beam impinges on
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH