Thereby, the semiconductor laser tip can be sealed in the hollow portion, so that {HEAD ~ the semiconductor laser tip} can be protected from {TAIL ~ dust}, moisture and the like 
Thereby , the semiconductor laser tip can be sealed in the hollow portion , so that { HEAD ~ the semiconductor laser tip } can be protected from { TAIL ~ dust } , moisture and the like
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH