Refractive index database

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Optical constants of BARBERINI - Sun Protection
D4150: ACE Improved

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants


20 °C
Sun Protection Glass; Colour: blue; Application: light tinted sunglare filter with contrast intensification and UV-absorption filter category 1 acc. to DIN EN 1836


Barberini D4150 glass specifications, 2010-11


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Barberini GmbH

Barberini GmbH is a German branch of Barberini S.p.A., the Italian company specializing in ophthalmic materials. Barberini GmbH has been formed after Barberini acquired the ophthalmic division of Schott AG in 2010. Barberini GmbH is renowned for its expertise in crafting high-quality optical glass, with a special focus on premium sunglass lenses. Headquartered in Germany, the company has carved a niche in the eyewear market by offering lenses that excel in optical clarity, durability, and ultraviolet protection. Utilizing mineral glass as a base material and incorporating advanced treatments like anti-reflective coatings, polarization, and photochromic technologies, Barberini caters to a discerning clientele that prioritizes both quality and performance. Their lenses find applications in high-end eyewear as well as specialized optical systems, making Barberini a leader in the premium optics industry. Given their commitment to quality and innovation, Barberini GmbH has become the lens of choice for several prestigious eyewear brands seeking to provide their customers with unparalleled optical excellence.

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Glass is a versatile, amorphous material that has been an essential component in optical technologies for centuries. Comprising mainly of silica along with various additives like soda, lime, or boron, glass can be engineered to exhibit a wide range of optical properties, such as refractive indices and dispersion characteristics. In the optical industry, specialized types of glass like crown, flint, and extra-low dispersion (ED) glasses are used for manufacturing lenses, prisms, and other optical elements. These glasses are precisely formulated to offer specific properties, such as low chromatic aberration or high light transmittance across different spectral ranges. Glass can also be coated with thin layers of materials like anti-reflective coatings to enhance its optical performance. More recently, advances in photonics and nanotechnology have led to the development of innovative glass types, such as photonic crystal and metamaterial glasses, which exhibit unique light-manipulating properties. It is crucial to note that the optical properties of glass, including its refractive index, can vary depending on its composition and temperature, making it important to consult specific data for particular applications. Overall, glass remains a foundational material in optics, its wide applicability owed to its tunable properties and general robustness.

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