Deposition and spectral performance of an inhomogeneous broadband wide-angular antireflective coating

The gradient index coatings and optical filters based on them are a challenge for fabrication. In a round-robin experiment basically the same hybrid antireflection coating for the visible spectral region has been deposited with three different techniques: electron beam evaporation, ion beam sputtering and radio frequency magnetron-sputtering. Spectral performances of such one-side and both-side coated samples have been compared with corresponding theoretical spectra of the designed profile. Also, reproducibility of each process is checked

OPTICAL COATINGS FORMED BY GRADIENT REFRACTIVE INDEX MATERIALS / METALŲ OKSIDŲ IR JŲ MIŠINIŲ PANAUDOJIMAS KINTAMO LŪŽIO RODIKLIO OPTINĖMS DANGOMS FORMUOTI

Recent advances in ion beam sputtering technology enabled efficient deposition of different oxide mixture coatings. In the present investigation, coating materials ZrO2and SiO2 were utilized for the synthesis of different mixtures. The goal of the conducted investigation was to explore the potential of ZrO2/SiO2 mixtures, especially for applications in the range of the UV spectral. Deposited dielectric mirrors having classical quarter-wave and “rised” design with ZrO2/SiO2 mixture for 266 nm and 355 nm showed good resistance to laser radiation. We also investigated the “fatigue” behavior of LIDT’s in LBO crystals with single, dual and triple wavelength anti-reflective coatings (AR@355, AR@532+1064 and AR@355+532+1064) in order to optimize design and layer materials. The influence of gradient refractive index profiles on damage resistance is of a special interest. We selected a few designs of antireflective coatings which demonstrated the best resistance to laser radiation. An experimental study on rugate filter coatings showed the need for a more accurate characterization of optical properties of metal oxides and their corresponding mixtures. Santrauka Šiame darbe tiriamas jonapluoščio dulkinimo technologija dengtų ZrO2/SiO2 ir jų mišinių optinių savybių pritaikymas kintamo lūžio rodiklio (Rugate tipo) optinėms interferencinėms dangoms formuoti. Mišiniuose naudojant mažą ZrO2 frakciją, buvo išplėstas šios medžiagos pritaikymas UV srityje. Remiantis gautais rezultatais, suformuotos didelio atspindžio (HR) ir skaidrinančios (AR) dangos esant λ = 355 nm bangos ilgio spinduliuotei, taip pat teoriškai sumodeliuotos ir suformuotos daugiabangio skaidrinimo (AR@ 355+532+ 064) Rugate tipo dangos ant LBO (LiB3O5) netiesinių kristalų. Palygintos šių dangų optinės savybės su tomis dangomis, kuriose panaudoti gryni metalo oksidai (fiksuoto lūžio rodiklio). Atliktas Rugate tipo dangų, pasižyminčių siaura didelio (R > 99,9 %) atspindžio zona ties 532 nm ir pralaidumu likusioje spektro dalyje, teorinis modeliavimas ir eksperimentinis garinimas. Raktiniai žodžiai: Rugate tipo dangos, metalų oksidai ir jų mišiniai, LBO kristalai, notch filtrai, jonapluoštis dulkinima

Wellenlaengenmultiplex-Verfahren fuer die Direktanwendung von Hochleistungs-Laserdioden Abschlussbericht

SIGLEAvailable from TIB Hannover: F01B1548 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung, Berlin (Germany)DEGerman

Mixed oxide coatings for optics

Material mixtures offer new possibilities for synthesizing coating materials with tailored optical and mechanical properties.We present experimental results on mixtures of HfO2, ZrO2, and Al2O3, pursuing applications in UV coating technology, while the mixtures are prepared by magnetron sputtering, ion beam sputtering, plasma ion-assisted deposition (PIAD), and electron beam evaporation without assistance. The properties investigated include the refractive index, optical gap, thermal shift, and mechanical stress. The first high reflectors for UVapplications have been deposited by PIAD