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