Design And Preparation Of Multifunctional Thin Films For Laser-Proof Devices

The traditional optical film can only meet specific optical performance,but it is limited in,complex environments such as damp heat,wind and sand,strong lasers and ultraviolet radiation.This paper aims to solve the problem of preparing multifunctional films with UV protection,laser protection,and high water repellency on goggles.It can compensate for the single function of the laser film and limited vision in rainy weather.In this paper,a multifunctional laser film was designed and prepared,which has a high cut-off in the ultraviolet band,a good transmittance in the visible light range,and high laser-induced damage threshold at the of 1064nm.The main conclusions obtained from the research are as follows:La Ti O₃and Si O₂films were deposited by the electron beam thermal evaporation technology on the single-polished silicon substrate,and their optical constants and laser-induced damage threshold were tested.It is found that under the optimal process conditions,the refractive index of the La Ti O₃film is 2.0 at the wavelength of 550 nm,and the extinction coefficient is 2.5×10^-6.The influence of different deposition temperatures on the LIDT of La Ti O₃films was explored.When the deposition temperature is 180?,the LIDT of La Ti O₃film is 7.6 J/cm~2.the refractive index of the Si O₂film is 1.47 at the wavelength of 550nm,the extinction coefficient is 1.3×10^-3,and the LIDT of Si O₂film is 11.0 J/cm~2.The article explores the influence of different process parameters on the optical constants and hydrophobic properties of the film.The study found that with the increase of substrate temperature,pressure and deposition rate,the refractive index of the hydrophobic film gradually increased,ranging from 1.4595 to 1.5838,and all of them had a small extinction coefficient.In the best process parameters,when the substrate temperature is 160?,the pressure is 1×10^-2Pa,and the deposition rate is 0.51 nm/s,the hydrophobicity of the film is the strongest,and the hydrophobic angle is as high as 119.3°,which is increased 92.0°compared with non-hydrophobic film.At the same time,this study shows that the hydrophobic film is deposited on the deposited of the anti-reflection coating without affecting the spectral transmittance of the film.An anti-reflection film with G/2HL/A is designed and prepared.After the anti-reflection film is coated on the surface,its transmittance is increased by 2.59%.Based on the optimization of electric field intensity,a multilayer film with a film structure of G/(2H2L)~82HL/A was designed and prepared.The reference wavelength is 520 nm,the average transmittance is91.28%from the wavelength range of 450 nm to 700 nm,and the transmittance of peak value is95.73%.The average transmittance is 2.34%at 1064±40 nm.Based on the analysis and adjustment of the sensitive layer of the multilayer film,a multifunctional laser film was finally prepared and tested.It is found that the optical properties of the multifunctional laser film are as follows:It is cut off in the wavelength range of 200 nm to 400 nm;in the wavelength range of 450 to 700 nm,the average transmittance is 94.71%.In the wavelength range of 1064±40nm,the average transmittance is 2.27%.The laser-induced damage threshold of the multifunctional laser film is 7.3 J/cm~2,and the water repellency angle is 119.6°.