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Windows are frequently used in optical systems to separate the environment in one part of the system from another, such as to seal vacuum or high-pressure cells. Because the infrared transmitting material has a high index of refraction, an anti-reflection coating is typically applied to windows to minimize losses due to reflections.
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Optical windows are made of optically transparent materials with parallel polished sides, ground edges and chamfers. The only difference between windows and filters is degree of attenuation of the optical spectrum.
The optical windows are usually intended to have maximum possible transmission for given material. The AR coatings are often applied on the polished sides of the optical windows to improve their transmission characteristics. Windows are often used as protective elements. However, they may have additional filter or beamsplitter function. We can produce custom windows on request.
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Windows are used to enable optical radiation to pass from one environment to another without allowing the environments to mix.
Optical flats are used with monochromatic light sources, such as sodium lamps, to evaluate surfaces of other optical elements.
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Opal glass is a superior diffuser to ground glass because it depends upon the scattering of light by particulate matter suspended in the glass itself rather than a surface reaction. It is correspondingly less efficient in overall transmission.
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Windows are used to isolate different physical environments while allowing light to pass. The selection of a window should consider the properties of the different optical materials, transmission, wavelength range, and resistance to the environment. Tower offers a wide range of different materials and a variety of anti-reflecting coatings that can be deposited on the windows.
Tower Optical manufactures windows from BK7, UV Grade Fused Silica and Sapphire. Other materials are available on a custom basis. In addition, we offer three different quality standards as described below. Contact factory for info on Sapphire Windows.
Mirrors are smooth, and contain a highly polished surface for reflecting light. The reflecting surface is usually a thin coating of aluminum or silver. Most mirrors for optical applications are called front surface types since the coating is on the front surface thereby eliminating the optical properties of the glass from affecting the incident or reflected light. The rear surface is usually fine ground. All of the following mirrors have a protected Aluminum coating applied to the front surface.
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The windows are designed to be used in precision optical systems. The optical transmission is high with little or no distortion of the transmitted signal.
* Windows - Zinc Selenide (no Ar)
* Windows - BK-7
* Windows - Fused Silica
* Windows - Germanium
* Windows - Heated
* Windows - Sapphire
* Windows - Silicon
* Windows - Zinc Sulfide
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Windows
Windows play an important role in optical design. Having an extensive manufacturing capability with a variety of materials, allows MediVision to offer our customers many choices. For a complete listing of IR materials please see that section.
Materials Synthetic Sapphire, Fused Silica, Quartz, Schott or equivalent.
Sizes: 4mm - 350mm (round or square)
Thickness: 1mm to 25mm
Surface Quality: up to 20-10
Parrallelism: up to 1sec
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Windows are applied to isolate different physical environments while allowing light to pass. When selecting windows you should consider materials, transmission, scattering, wavefront distortion, parallelism and resistance to certain environment. Tempotec offers a wide range of different materials and different degree of precision windows.
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Standard Specifications
Diameter: 0.995" +/- 0.005"
Thickness: 0.060" +/- 0.005"
Surface Quality: 20/10 S & D
Surface Accuracy: 1/4 over 85% clear aperature
Edge Bevel: 0.010" Maximum @ 45°
P2S: Polished two sides
Quantity: Volume Discounts available
Custom: VPG manufactures precision windows with varying thickness, dimensions, materials, flatness and surface finish.
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