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This study used pulsed laser deposition (PLD) to create nano-films of cadmium oxide (CdO) that were deposited at various substrate temperatures of 200, 300, and 400 °C, to reach the optimum substrate temperature for deposited films. The pulsed laser system with a 1064nm wavelength, pulse duration of 10 ns, and pulsed energy of 1800 mJ energy has been applied on the CdO target for ablation of the CdO nano-grains on a substrate of the quartz. The transmittance results of the deposited nano-films provide high transparency reach to 86%, which decreases as the substrate's temperature increases, as well as the absorption results, which decrease as the temperatures of the substrate increase. Finally, the optical energy gap for the deposited films at various substrate temperatures ranged from 2.08 to 2.85eV, as the temperatures of the substrate increased. These results give an indication that the deposited films can be used in optoelectronics devices. [ABSTRACT FROM AUTHOR]