Thermally induced holehyphen;electron competition in photorefractive InP:Fe due to the Fe2+excited state

摘要

The photorefractive coupling gain is limited in InP:Fe even if there is no direct holehyphen;electron competition. One has to take into account the excited state of Fe2+(5T2) with its strong thermal emission(1/bgr;thbartil;100 ns). This leads to an indirect holehyphen;electron competition mechanism and helps to explain experimental results. This coupling gain reduction is inherent to the nature of the Fe dopant in InP for wavelengths below 1.2 mgr;m and temperature above 170 K.