Laser-Induced Damage Characteristics of VO2-SiO2 Composite Films
The VO2 and VO2-SiO2 composite films were prepared by sol-gel method.The phase structure and transmittance of films were characterized by X-ray diffraction(XRD)and ultraviolet visible spectrophotometer.The results reveal that the prepared VO2 film is monoclinic phase(B),and the XRD patterns of VO2-SiO2 composite film is similar to that of VO2 film.The optical transmittance of films have reached over 90％within the range of 450 nm to 800 nm.The laser induced damage threshold(LIDT)of VO2-SiO2 composite film is 3.9 J/cm2,which is 77.3％higher than that of VO2 film.The difference in damage morphology between VO2 film and VO2-SiO2 film were studied by FESEM and step analyzer.The VO2 film exhibits melt type damage,while the VO2-SiO2 film exhibits melt type damage and stress damage.In addition,laser-induced damage models for different films were constructed and damage characteristics and underlying mechanisms were discussed.
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