[en] La_0.67Ba_0.33MnO₃ (LBMO) thin films of high quality were successfully fabricated at low temperature (400-450 deg. C) using pulsed laser deposition assisted by CO₂ laser irradiation. It is shown that, at a low deposition temperature, LBMO thin films exhibit poor crystallinity and electrical and magnetic properties. With the aid of laser irradiation, LBMO thin films are significantly improved in their structure and quality and display a resistivity maximum of 6.3 mΩ cm at 304 K, a large magnetoresistance of 20% (at 300 K, H = 2 T) and a ferromagnetic Curie temperature of ∼320 K, which are close to those of the LBMO thin films deposited at 800 deg. C. The observed improvement in the properties of the LBMO thin films deposited at low temperature is inferred to be largely associated with the enhanced crystallinity of the film and a decrease in the oxygen deficiency due to laser irradiation.