Uni Optics’s colour glass filters are manufactured by injecting coloured dye into a glass substrate.
1、How do optical filters work?
Optical filters are passive devices that allow the transmission of a specific wavelength or set of wavelengths of light. Absorptive filters have a coating of different organic and inorganic materials that absorb certain wavelengths of light, thus allowing the desired wavelengths to pass through.
2、What is the central wavelength of a red filter?
Recall that the visible wavelength ranges are: 430 to 490 nm = blue; 490 to 530 nm = green; 530 to 580 nm = yellow; 580 to 630 nm = orange and 630 to 700 nm = red.
Common specification
Material: color glass
Bevel:<0.25mm X 45°
Coating: Optional (Uncoated, AR Coating, etc.)
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Standard
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High Precision
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Dimension Tolerance
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+0.0/-0.2
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+0.0/-0.02
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Thickness Tolerance
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±0.2
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±0.05
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Surface quality:
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60-40
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20-10
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Clear Aperture
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>85%
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>95%
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Flatness(per 25mm@633nm)
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λ /2
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λ /8
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Parallelism
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3 min
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10 sec
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