Analysis of optical coatings and thin films

Abstract

We report the fabrication of interdigitated electrodes on Ga doped ZnO thin film and the photo response studies are performed. The thin film is deposited using pulsed laser deposition method and glancing angle deposition. We report deposition of dual additive assisted Ta2O5 / SiO2 AR coatings on fused silica substrates through sol-gel and dip coating processes. Ta2O5 films prepared using additives exhibit enhanced refractive index and film thickness resulting into elevated LIDT. Optimal results such as ~ 99.6% transmission at 968 nm and LIDT value of ~20 J/cm 2 are achieved for Ta2O5 / SiO2 AR coatings. A comparative study is made between additive free and additive assisted Ta2O5 film and role of additive in enhancing the efficacy of the optical performance of the AR coatings is discussed.