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