Improved Production of Large and Multi-Directional Homogeneous Optical Glass: SCHOTT N-BK7<sup>®</sup> for Challenging Applications

نویسندگان

چکیده

In many applications, the spatial refractive index variation – called homogeneity within a measurement aperture either in one or two directions is important. Typical application examples are prisms ultra-precision metrology with stability multiple directions. Large lenses used artificial laser guide star systems for atmospheric correction large telescopes. The challenge of enabling highest homogeneities requires tight control all production steps from melting to hot forming and fine annealing. optical formats can be produced as singular castings moulds up 1.2 m diameter 250 mm thickness. Smaller available blocks dimensions approx. x 180 mm3. A more economic ecologic way continuous strips glass 500 width 120 Recently SCHOTT has improved these continuously jumbo significantly. Now H4 quality (2 ppm maximum variation) provided on apertures 900 mm. This paper gives an insight overview latest results current state this topic at manufacturer SCHOTT.

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ژورنال

عنوان ژورنال: Epj Web of Conferences

سال: 2022

ISSN: ['2101-6275', '2100-014X']

DOI: https://doi.org/10.1051/epjconf/202226603018