The first GaInAsP based laser diode grown by ail solid source molecular beam epitaxy is reported. A strained-layer GaInAsP/InP separate confinement heterostructure multiquantum well laser emitting at 1.35 mu m was prepared. A low threshold current density of 510 A/cm(2) was obtained for a broad-area laser having a cavity length of 1300 mu m.