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How to Choose Fused Silica Windows: A Comprehensive Guide.
Fused silica windows are commonly used in various fields such as scientific research, laser technology, and optics. They are preferred over other materials due to their high thermal stability, low coefficient of thermal expansion, and high transmission in the ultraviolet (UV) and infrared (IR) regions. However, choosing the right fused silica window for your application can be overwhelming, especially if you are not familiar with the technical specifications. In this comprehensive guide, we will discuss the key factors to consider when choosing fused silica windows.
1. Transmission.
One of the most important factors to consider when choosing fused silica windows is their transmission. Transmission is the percentage of light that passes through the window without being absorbed or scattered. It is usually measured as a function of wavelength. Fused silica windows have high transmission in the UV and IR regions, making them ideal for applications such as spectroscopy, laser technology, and remote sensing.
2. Surface Quality.
The surface quality of fused silica windows is another crucial factor to consider. Surface quality is usually specified by the scratch and dig (S/D) rating. The S/D rating is a measure of the number and size of scratches and digs on the surface of the window. A lower S/D rating indicates a smoother surface, which is essential for applications such as laser optics and interferometry.
3. Flatness.
Flatness is the degree to which a window's surface approximates a perfect plane. It is an essential parameter for applications that require parallelism or wavefront control. Fused silica windows are known for their high flatness, which is usually specified in terms of fringes or microns.
4. Coating.
Coatings are often applied to fused silica windows to enhance their performance. Anti-reflective coatings, for example, can reduce unwanted reflections and increase transmission. Coating specifications usually depend on the application and the wavelength of interest.
5. Dimensional Tolerance.
Dimensional tolerance refers to the allowable deviation from the specified dimensions of the window. It is essential to ensure that the window fits properly in the system and does not cause misalignment or distortion. Dimensional tolerance is usually specified in terms of microns or fractions of an inch (FOI).
In conclusion, selecting the right fused silica windows for your application requires careful consideration of the above factors. The transmission, surface quality, flatness, coating, and dimensional tolerance are all critical parameters that can significantly affect the window's performance. By taking these factors into account, you can choose the most suitable fused silica windows for your application and achieve the best results.
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