{HEAD ~ An optical isolator element} which is disposed in {TAIL ~ front} of a laser array comprised of a plurality of laser active regions arranged in parallel, comprising 
{ HEAD ~ An optical isolator element } which is disposed in { TAIL ~ front } of a laser array comprised of a plurality of laser active regions arranged in parallel , comprising
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH