Reflectivity and laser ablation behavior of La_1-xSr_xTiO_3+δ coating

La_1-xSr_xTiO_3+δ (LST) has been studied in many fields due to its excellent physical and chemical properties. However, there are rare reports on its optical properties, especially reflectivity. Our previous work has prepared LST coatings by atmospheric plasma spraying technique, but the reflectivity is much lower than that of LST powder itself. In this paper, LST coating was prepared by knife coating which is a traditional convenient method. The phase structure and surface morphology of the coating were examined by X-ray diffraction and scanning electron microscopy, respectively. The optical property was characterized by UV-visible-near infrared spectroscopy and the laser ablation tests were carried out by YSL-2000 Fiber Laser (IPG Co) with the wavelength of 1070 nm and the spot size of 10 mm · 10 mm. Results show that the reflectivity of the LST coatings depends on the weight ratio of LST and binder. A high-reflectivity coating can be prepared by knife coating with appropriate content of LST.