Influence of the composition and morphology of dielectric mirrors of LIDAR complexes on their optical breakdown threshold
M.M. Zinovev1,2,3, V.S. Kuznetsov2,3, N.N. Yudin1,2,3, E.S. Slyunko2,3, S.N. Podzyvalov2,3, A.B. Lysenko2,3, A.Yu. Kalsin2,3, A.Sh. Gabdrakhmanov2,3, D.V. Vlasov2
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
2National Research Tomsk State University, Tomsk, Russia
3LLC "Optical Crystal Laboratory", Tomsk, Russia
Keywords: dielectric mirror, LIDAR, substrate, quartz, morphology, optical breakdown
Abstract
The paper presents the results of studying the influence of the morphology and composition of thin films that form the structure of dielectric mirrors of optical resonators of coherent sources for LIDARs. The Optilayer software simulated dielectric mirrors based on two pairs of materials: TiO2/SiO2 and ZnS/YbF3. Using electron and atomic force microscopy, their morphological features were determined. The calculated structure of the interference coating was deposited onto a substrate using the ion-beam sputtering method. The threshold of laser-induced breakdown of dielectric mirrors by Nd:YAG laser radiation at a wavelength of 1064 nm was found to be 4 J/cm2 for a TiO2/SiO2 mirror and 4 J/cm2 for a ZnS/YbF3 mirror.
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