We present a novel superluminescent diode （SLD） with high optical performances for hardened neutron irradiation. The degradation of the light output from the SLDs is caused by a reduction of the minority carrier lif...We present a novel superluminescent diode （SLD） with high optical performances for hardened neutron irradiation. The degradation of the light output from the SLDs is caused by a reduction of the minority carrier lifetime resulting from displacement damage after high-energy neutron irradiation. The SLDs with a higher pre- irradiation light output will be less sensitive to radiation. We have selected an InGaAsP/InP multi-quantum well （MQW） as the active region structure for its performance, its high optical gain and minute active region. Graded- index separate-confinement-heterostructure （GRIN-SCH） has been applied for the waveguide structure. A specific absorbing region and anti-reflective coatings have been designed and optimized. Moreover, the radiation test results indicate that the SLD with an InGaAsP/InP MQW structure has better neutron hardening ability than the SLD with DH structures after a 6×10^13-1×10^14 n/cm^2 1 MeV neutron irradiation.展开更多
文摘We present a novel superluminescent diode （SLD） with high optical performances for hardened neutron irradiation. The degradation of the light output from the SLDs is caused by a reduction of the minority carrier lifetime resulting from displacement damage after high-energy neutron irradiation. The SLDs with a higher pre- irradiation light output will be less sensitive to radiation. We have selected an InGaAsP/InP multi-quantum well （MQW） as the active region structure for its performance, its high optical gain and minute active region. Graded- index separate-confinement-heterostructure （GRIN-SCH） has been applied for the waveguide structure. A specific absorbing region and anti-reflective coatings have been designed and optimized. Moreover, the radiation test results indicate that the SLD with an InGaAsP/InP MQW structure has better neutron hardening ability than the SLD with DH structures after a 6×10^13-1×10^14 n/cm^2 1 MeV neutron irradiation.
