Effect of gamma irradiation on emission characteristics of laser heterostructures

Changes in the threshold current and slope efficiency are studied under conditions of gamma-ray irradiation by injection InGaAsP/InP lasers emitting at 1.3 mm (irradiation dose is ~10¹⁴ — 10¹⁷ photon cm^-2). We observed an improved performance at low values of the quantum flux density and degradation at doses greater than 10¹⁴ photon cm^-2.