Proceedings PaperHigh Reflectance Low Scatter Laser Mirrors
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High reflectance low-scatter mirrors have been developed for laser-gyro applications. The mirrors were made of a multilayer system consisting of SiO2 and of a new unusual material for the high index layer. This material is a compound of titanium oxide and praseodymium oxide which is oxygen depleted (PrTiO3-x). To obtain best results superpolished substrates were fabricated. They were examined by high resolution Nomarski differential contrast microscopy and light scattering. The laser mirrors were produced in a Balzers BAK 600 plant. Both coating materials were electron-gun evaporated at different oxygen partial pressures. The fabricated mirrors were investigated in terms of reflectivity and scattering using an ultra-precise measurement equipment. Scattering was measured in an Ulbricht integrating sphere; resolution: 0.2.10-6. Reflectivity measurements were carried out in a special developed reflectometer with a resolution of 10.10-6.