The thermo-gravimetric analysis (TGA) and differential thermal analysis (DTA) of the as-deposited and electrochemically oxidized Hg ₁ Ba ₂ Ca ₁ Cu ₂ O _6+δ( Hg -1212) samples were carried out in air, flowing oxygen and nitrogen environment in order to estimate the thermal decomposition temperature and hence to maintain the annealing temperature and atmosphere. After annealing, electrochemically synthesized films showed an increase in T_c from 104.7 K to 119 K and J_c values from 1.43×10³ to 4.3×10³ A/cm ². Electrochemically oxidized Hg -1212 films in under-, optimally- and over-doped states were irradiated with a Red He – Ne laser (2mW) and the T_c was found to increase from 104.7 K to 106 K and J_c from 1.43×10³ to 1.89×10³ A/cm ². The effects of annealing and photo-irradiation on structural, microstructural and superconducting properties of electrochemically synthesized Hg-1212 films were investigated and discussed in detail in this paper.