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