Basic Research On V₂O₅/diamond Films In Laser Blinding Protection

With the development of photoelectric detection equipment, infrared window has become a key part in the photoelectric detection system, which is used to ensure the optical performance of photoelectric sensor and to protect infrared sensor and photoelectric system from external attack. With the rapid development of laser technology, the research on anti-laser blinding technology in mid-to far-infrared dual-band detector has become more and more important. The vanadic pentoxide(V2O5) film is a new nonlinear transparence material with thermal induced phase transition, which can be used on both optical signal receptivity and blinding laser protection in broad waveband. Owing to its fine high infrared transmittivity and high laser damage threshold, diamond is ideal infrared window material. V2O5/diamond films have wide application prospects in blinding laser protection, which combine superior performance of diamond with nonlinear optical property of thermal induced phase transition films. In this thesis, the basic research on design and preparation of V2O5/diamond films is carried on. The main research contents and results are as following:1. According to single wavelength, the mathematical infrared transmittivity model of V2O5/diamond films was established, and the theoretical transmissivity of films was calculated based on the absorption film’s eigenmatrix method. The optimal thickness was calculated to be 147 nm by using Matlab software programming. According to multiband, the infrared anti-reflective coating applied on laser protection was designed based on design theory of films and optimized by TFCalc.2. The thickness control and measurement technology of V2O5 thin films were studied. V2O5 films were prepared on sapphire substrate and quartz glasses by RF magnet sputtering method to obtain the sputter preparation process of V2O5 films. The XRD, AFM and SEM analysis results show that V2O5 films prepared on sapphire substrate and quartz glasses are polycrystal on(001) preferred orientation. The surface roughness is below 2nm and the film is uniform and dense.3. V2O5 films with polycrystalline structure on(001) preferred orientation and surface roughness of 1.31 nm were prepared on diamond. The micro-structure and optical electrical characteristics of films were studied. The results show that when the thickness of V2O5 films is 150 nm, the electrical mutation characteristic is best and its amplitude of variation of resistance is larger-on the order of 103. It can be seen that the transmittance could be reduced 57% with good photoswitch characteristic at wave length of 3~5μm.