Comparison of optical transmission between sapphire substrate (blue line) and quartz-coated substrate (gray line).
Time:
2024-04-17
When optical transmission is required in the ultraviolet (above 200 nanometers) or infrared (below 5 micrometers) range, sapphire substrates are very suitable for use instead of glass substrates. Low-temperature optical measurements will also benefit from the high thermal conductivity of the sapphire matrix, and they can also be used in high-temperature environments up to 2300K.
Specification
We offer sapphire substrates with three different surface finishes. Our "standard" sapphire substrate has been polished to a surface quality of 60/40 scratch dig, with an RMS roughness of about 0.3 nanometers, suitable for most applications (including spectroscopy or thin film deposition).
In contrast, our "ultra-smooth" sapphire substrate has been polished to a surface quality of 10/5 scratch dig, with an RMS roughness of about 0.1 nanometers, suitable for any application involving atomic force microscopy, 2D materials, or where surface quality is critical.
We also stock sapphire with a "rough" surface finish (although still smoother than most glass substrates), with a scratch rate higher than 80/50 and an RMS roughness slightly higher, around 0.7 nanometers. These substrates are ideal if you are not concerned about a small amount of optical scattering.
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