What is the index of fused silica?
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Index of Fused Silica
Fused silica, also known as silica glass or quartz glass, is a type of glass made from silica in non-crystalline (amorphous) form. It is produced by either melting high-purity silica sand or synthesizing silicon tetrachloride. Its excellent optical properties, combined with its resistance to high temperatures and chemicals, make it very valuable in a range of technologies including optics, semiconductors, and telecommunications.
Refractive Index of Fused Silica
The refractive index of fused silica at room temperature is approximately 1.458 at a wavelength of 589 nanometers (the standard Na D-line).
It's important to note that the refractive index of fused silica varies with wavelength, following the Cauchy or the more detailed Sellmeier equation, which describes its dispersive properties. Typically, the refractive index decreases with increasing wavelength.
The refractive index of fused silica also varies with temperature. The material's index of refraction decreases as the temperature increases, although this change is relatively small compared to some other materials.
Applications of Fused Silica
- Lens and mirror substrates for high-power lasers
- Windows and prisms in precision optical instruments
- UV transmission and resistance components
- Fibers for telecommunications
- Components used in semiconductor manufacturing
The careful consideration of fused silica's refractive index is critical in the design and engineering of optical systems, ensuring optimal performance across different applications.