{HEAD ~ A laser unit} 7, wherein {TAIL ~ said base} includes one of a step portion and a cut away portion at a laser light emission end of said base, and wherein said photodiode is disposed at said step or cut away portion 
wherein
{ HEAD ~ A laser unit } 7 , wherein { TAIL ~ said base } includes one of a step portion and a cut away portion at a laser light emission end of said base , and wherein said photodiode is disposed at said step or cut away portion
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH