Refractive index database

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Optical constants of NSG - multiple purpose
Pilkington Optiwhite™ (Low iron glass)

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants


Variable-angle ellipsometer was used to take amplitude and phase change measurements. The refractive index and extinction coefficient was extracted for NSG Opti-White (low-Fe) glass from a multi-oscillator model fit to the ellipsometry data, as a function of wavelength, from 300 to 1500 nm


R. E. Treharne. RF magnetron sputtering of transparent conducting oxides and CdTe/CdS solar cells, PhD Thesis, University of Durham (2011) (Numerical data kindly provided by Dr. Robert Treharne)


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Nippon Sheet Glass (NSG group)

Nippon Sheet Glass Co., Ltd., commonly known as NSG Group, is a Japanese multinational corporation renowned for its expertise in glass and glazing solutions. Founded in 1918, the company has diversified its operations over the years to encompass a range of sectors including automotive glass, architectural glass, and specialty glass used in optical and electronic applications. In the realm of optics, NSG Group has been a key provider of high-quality optical glass materials, including specialized products for imaging systems, displays, and other precision optical components. The company's optical glass often finds applications in lenses, prisms, and filters where high optical performance and durability are critical. With a strong focus on research and development, NSG Group has continually pushed the boundaries of glass technology, introducing products that meet stringent quality and performance criteria. Their wide-ranging impact from everyday consumer products to industrial and scientific applications establishes them as a significant player in the global glass industry. With a commitment to innovation and quality, NSG Group remains a go-to choice for businesses and organizations in need of specialized glass solutions.

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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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