The　effect　of　CO2　laser　irradiation　on　La0.67Ba0.33MnO3　epitaxial　thin　film　was　investigated.　Epitaxial　thin　films　grown　by　pulsed　laser　deposition　were　irradiated　by　a　CO2　laser　in　air　for　10-60　s.　It　is　shown　that　after　CO2　laser　irradiation　treatment,　the　crystallinity　of　the　film　is　strongly　enhanced.　It　is　found　that　a　dramatic　decrease　in　the　resistivity　of　the　CO2-laser-irradiated　film　is　accompanied　by　a　remarkable　increase　in　its　insulator-metal　transition　temperature　and　the　temperature　coefficient　of　resistance.　This　significant　improvement　of　its　structure　and　properties　is　achieved　in　several　dozens　of　seconds　and　surpasses　that　observed　in　films　annealed　in　an　oxygen　atmosphere　at　900　degrees　C　for　12　h,　suggesting　that　CO2　laser　irradiation　is　a　new　and　effective　tool　to　optimize　CMR　manganites　for　bolometric　applications.　(C)　2007　Elsevier　Ltd.　All　rights　reserved.