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