The upward pulling of the seed is at a much slower rate than the downward growth of the crystal. Unlike the other two methods described above, the crystal is formed in-situ. This is placed inside the vacuum furnace which has a cold finger cooled by helium in contact with the base of the crucible where the seed is located. The alumina oxide feed stock is then heated above its melting point, while the seed is maintained in a solid state. The crystallization takes place as the furnace temperature is slowly decreased, and the helium flow to the cold finger is increased.
This process produces a large single crystal sapphire boule free of residual stress. With superior hardness, strength, durability, and survivability compared to other optical materials. It is the material of choice for optical applications involving exposure to high stresses and harsh environments. Sapphire is one of the strongest and hardest optical materials available with excellent abrasion, chemical, and thermal shock resistance.
The hardness of sapphire on the Mohs scale is 9, compared to a value of 10 for diamond. This is due to our proprietary finishing processes. These processes produce extremely smooth, and flat surfaces with a damage free subsurface.
These processing techniques significantly improves the strength of sapphire window. In addition to our standard stock windows, various configurations can be custom fabricated to customer requirements and specifications. Custom antireflective coatings are available upon request. Sapphire is pure Alumina Oxide Al2O3 in a single crystal form. The anisotropic crystal structure is rhombohedral which produces different physical and optical properties dependent on the crystal orientation.
We maintain a substantial inventory of these sapphire windows and most are available for shipment from stock. If you have a specific need or question that isn't addressed here - please let us know!
Many thanks for posting this. It brought life back to my long-time cherished Focusrite Saffire device. After having installed the legacy firewire windows driver, your guide made my sound card live again! I wonder why Focusrite don't opensource the driver at least, when they don't want to support it anymore.
Cheers and thank you again! Thanks to topic starter. Very good solution to bring life to very good hardware under Windows I have to say about Texas Instrument FW cards. They are do not require to change driver to special legacy version.
At least, with my card. Just tested with onboard VIA chip - works too. But not long tested. Third known firewire chip manufacturer is NEC, but i have no such card to test it too. Some soundcard manufacturers recommends to change driver to legacy for resolving stability issues. Tried all the things but this time the Saffire will not boot.
Will I ever get it working with Windows again? Who knows? Probably advise against installing the update for the time being 1. Quote from Aitchy: Hmmmmm Probably advise against installing the update for the time being. Thanks to the original poster - this totally saved me.
It's remarkable to me that this old interface still compares extremely favourably to anything on the market now. In fact, I considered upgrading until I realised that everything else out there is basically the same thing with less outputs!
I have just been through the windows update and it broke it again, but I did manage to fix it. The device won't boot when you plug it in, just close the installer and move to the next step. Ultra Thin Sapphire Window. Sapphire Windows Polishing. Sapphire Window Coating Metallization. About us. Custom Optics. Sapphire Windows made of Synthetic sapphire feature exceptional properties of high hardness, high strength, scratch resistance, high temperature resistance, chemical durability and excellent transmission bandwidths.
Properties of Sapphire Windows. Optical Windows are used as viewports to protect other components within an optical assembly, instrument or laser. In certain applications, optical windows are required to withstand harsh environmental conditions and provide high levels of performance and reliability.
Sapphire window has several unique properties that make it ideal material for these applications. Synthetic Sapphire, the single crystal form of Al2O3, is one of the hardest materials 9 Mohs hardness. Because of its structural strength, sapphire window can be made much thinner than other common optical windows, with better transmittance performance. High thermal stability and excellent thermal conductivity make sapphire window suitable for the applications in high power.
The loss in a sapphire window is less than in other common optical window.
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