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We present two loop corrections to photon self energy at finite temperaturein real time formalism. An expression for renormalized coupling constant hasbeen derived in a form that is relevant for all temperature ranges of interestin QED, specifically for temperatures around T \sim m, where m is electronmass. Temperature dependence is mainly contributed by hot fermions at T \ge m.We use the calculations of vacuum polarization to determine the dynamicallygenerated mass of photon, Debye screening length, plasma frequency up to thesecond order in \alpha as well as the electromagnetic properties of a medium atm \le T \le 2m temperature. For higher temperatures, the existingrenormalization scheme does not work well because of the increase in couplingconstant. To exactly determine the validity of renormalization scheme, higherorder calculations are required. The temperature T \sim m is of specificinterest from the point of view of the early universe. Such calculations haveacquired more significance recently due to the possibility of producingelectron-positron plasmas in laboratory.

Second order photon loops at finite temperature and charge renormalization