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Windows
Windows are used to allow optical radiation to pass from one environment to another without allowing other components of these environments to mix. The environments may vary widely in temperature, pressure, chemical composition, phase or cleanliness. The criteria used to select the appropriate windows may include wavelength transmission, scattering, wavefront distortion and resistance to certain environments.
WITOPTICS windows are available in a wide range of sizes and materials including BK7, CaF2, Fused Silica and Sapphire.
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Attribute
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Specification
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Material
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BK7, CaF2, Fused Silica and Sapphire
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Typical Diameter (Φmm)
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8.0, 10.0, 12.7, 15.0, 20.0, 25.4, 30.0
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Typical Thickness (mm)
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1.0, 2.0, 3.0, 4.0
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Diameter Tolerance (mm)
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+0.0/-0.1 (General), +0.0/-0.05 (High Precision)
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Thickness Tolerance (mm)
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±0.1 (General), ±0.01 (High Precision)
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Clear Aperture
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>80% (Small Size), >90% (Large Size)
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Parallelism
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3 min. (General), 3 sec. (High Precision)
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Surface Quality
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60/40 (General), 10/5 (High Precision)
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Flatness (per 25mm@633nm)
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λ/4(General), λ/10 (High Precision)
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Bevel (face width x 450)
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<0.25mm
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Coating
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Uncoated, AR, HR, PR Coating, etc.
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Note for Windows:
(1). Custom-made windows at any size are available.
Besides round, windows at shape of quadrate, triangular, or other polygonal are available.
(2). Thickness from 1.0mm to 50.0 mm is available upon request.
(3). 100% clear aperture is available upon request.
(4). Better bevel is available upon request.
(5).Windows with Anti-Reflective(AR), High-Reflective(HR), Partial-Reflective(PR) coating are available.