AS Aldwayyan, RH Al-Hothlool, MS Alsalhi and MYA Raja
Keywords: VCSELs characteristics, neutron radiation exposure, spectral and dynamical behavior.
Abstract: The effects of 1 MeV neutrons irradiation on vertical-cavity surface-emitting lasers (VCSELs) characteristics are experimentally investigated. It is found that quantum efficiency of VCSELs changes as the radiation dose changes threshold current (increase of ? 0.3Ith). This effect is explained as a result of minorities carrier lifetime decrease. Red or blue shifts in the peak emission profile due to neutrons radiation were also noticed. Kind of shift depends on the radiation effect considered where active region temperature could increase (red shift) or the attenuation coefficient of photons in the energy gap might also increase (blue shift). Neutrons exposure may induce ‘self-pulsations’ in the output of some VCSELs while other devices became more stable after same dose of radiation. Knowledge of the behavior of VCSELs under neutrons radiation exposure will be useful for their applications in hostile environment.
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