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Page 13 - Optical Filters for Precise Wavelength Control

Bandpass Interference Filters 25.4mm
Ealing Catalog
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Bandpass Interference Filters 25.4mm
Essentially a stack of Fabry-Perot cavities, these filters select the transmitted spectrum by constructive and destructive interference at the boundaries between high and low index dielectric layers. Several cavities may be combined to produce a sharper cut-off and to alter the shape of the passband. Two three and four cavity designs ...

Specifications
Central Wavelength: 488 nm
Bandwidth (FWHM): 1 nm
Peak Transmittance: 35 %
Data Sheet
Variable Neutral Density Filter
Union Optic
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Variable Neutral Density Filter
Material B270 Glass Dimension Tolerance +0.0/-0.2mm Thickness 1.5±0.2mm Flatness <2λ@632.8nm Surface Quality 60/40 scratch and dig Parallelism <3 arc minutes Clear Aperture >90% Design Wavelength 400-700nm Coating Metallic reflective coating OD Tolerance ±5% of OD Extremes

Specifications
Attenuator Type: Other
Shape: Round, Square, Custom
Size: 50 mm
Optical Density: 0-3
Data Sheet
Neutral Density Filter-Reflective
Union Optic
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Neutral Density Filter-Reflective
Material B270 Glass Dimension Tolerance +0.0/-0.2mm Thickness 2.0±0.2mm Flatness 2λ@632.8nm Surface Quality 80/50 scratch and dig Parallelism <5 arc minutes Clear Aperture >90% Design Wavelength 400-700nm Coating Metallic reflective coating OD Tolerance ±10% of OD

Specifications
Attenuator Type: Reflective
Shape: Round, Square, Custom
Size: 25.4 mm
Optical Density: 0.1-3
Data Sheet
Union optic Color Glass Filter
Union Optic
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Union optic Color Glass Filter
Due to its selective absorption in visible wavelength range, color glass filter will exhibit various color depending the glass type. Color glass filter provides an economical filter for various applications. Optical glass filters are widely used in safety glasses, industrial measurement, regulation technology and environment ...

Specifications
Shape: Round, Square, Custom
Size: 25.4 mm
Thickness: 3 mm
Color Series: Yellow, Orange, Red & Black, IR Transmitting, Black & Blue, UV Transmitting, Colorless, VIS Tr, IR Abs, Green, Blue, Blue-Green, Multi-Band
Data Sheet
FNG4050 - Absorptive Glass Neutral Density Filters
Knight Optical (UK) Ltd
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FNG4050 - Absorptive Glass Neutral Density Filters
Glass Neutral Density filters attenuate light by absorption just like the gelatine neutral density filters. Glass ND Filters are more robust and tend to have more uniform absorption characteristics. They also attenuate by absorption and so care must be taken to avoid overheating. Attenuation is achieved by polishing glass ...

Specifications
Attenuator Type: Absorptive
Shape: Square
Size: 50 mm
Optical Density: 4.0
Data Sheet
FNG3050 - Absorptive Glass Neutral Density Filters
Knight Optical (UK) Ltd
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FNG3050 - Absorptive Glass Neutral Density Filters
Glass Neutral Density filters attenuate light by absorption just like the gelatine neutral density filters. Glass ND Filters are more robust and tend to have more uniform absorption characteristics. They also attenuate by absorption and so care must be taken to avoid overheating. Attenuation is achieved by polishing glass ...

Specifications
Attenuator Type: Absorptive
Shape: Square
Size: 50x50 mm
Optical Density: 0.1
Data Sheet
FNG2550 - Absorptive Glass Neutral Density Filters
Knight Optical (UK) Ltd
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FNG2550 - Absorptive Glass Neutral Density Filters
Glass Neutral Density filters attenuate light by absorption just like the gelatine neutral density filters. Glass ND Filters are more robust and tend to have more uniform absorption characteristics. They also attenuate by absorption and so care must be taken to avoid overheating. Attenuation is achieved by polishing glass ...

Specifications
Attenuator Type: Absorptive
Shape: Square
Size: 50 mm
Optical Density: 2.5
Data Sheet
FNG2050 - Absorptive Glass Neutral Density Filters
Knight Optical (UK) Ltd
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FNG2050 - Absorptive Glass Neutral Density Filters
Glass Neutral Density filters attenuate light by absorption just like the gelatine neutral density filters. Glass ND Filters are more robust and tend to have more uniform absorption characteristics. They also attenuate by absorption and so care must be taken to avoid overheating. Attenuation is achieved by polishing glass ...

Specifications
Attenuator Type: Absorptive
Shape: Square
Size: 50 mm
Optical Density: 2.0
Data Sheet
FNG1550 - Absorptive Glass Neutral Density Filters
Knight Optical (UK) Ltd
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FNG1550 - Absorptive Glass Neutral Density Filters
Glass Neutral Density filters attenuate light by absorption just like the gelatine neutral density filters. Glass ND Filters are more robust and tend to have more uniform absorption characteristics. They also attenuate by absorption and so care must be taken to avoid overheating. Attenuation is achieved by polishing glass ...

Specifications
Attenuator Type: Absorptive
Shape: Square
Size: 50 mm
Optical Density: 1.5
Data Sheet
FNG0850 - Absorptive Glass Neutral Density Filters
Knight Optical (UK) Ltd
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FNG0850 - Absorptive Glass Neutral Density Filters
Glass Neutral Density filters attenuate light by absorption just like the gelatine neutral density filters. Glass ND Filters are more robust and tend to have more uniform absorption characteristics. They also attenuate by absorption and so care must be taken to avoid overheating. Attenuation is achieved by polishing glass ...

Specifications
Attenuator Type: Absorptive
Shape: Square
Size: 50 mm
Optical Density: 0.8
Data Sheet
FNG0650 - Absorptive Glass Neutral Density Filters
Knight Optical (UK) Ltd
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FNG0650 - Absorptive Glass Neutral Density Filters
Glass Neutral Density filters attenuate light by absorption just like the gelatine neutral density filters. Glass ND Filters are more robust and tend to have more uniform absorption characteristics. They also attenuate by absorption and so care must be taken to avoid overheating. Attenuation is achieved by polishing glass ...

Specifications
Attenuator Type: Absorptive
Shape: Square
Size: 50 mm
Optical Density: 0.6
Data Sheet
FNG0550 - Absorptive Glass Neutral Density Filters
Knight Optical (UK) Ltd
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FNG0550 - Absorptive Glass Neutral Density Filters
Glass Neutral Density filters attenuate light by absorption just like the gelatine neutral density filters. Glass ND Filters are more robust and tend to have more uniform absorption characteristics. They also attenuate by absorption and so care must be taken to avoid overheating. Attenuation is achieved by polishing glass ...

Specifications
Attenuator Type: Absorptive
Shape: Square
Size: 50 mm
Optical Density: 0.5
Data Sheet
FNG0450 - Absorptive Glass Neutral Density Filters
Knight Optical (UK) Ltd
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FNG0450 - Absorptive Glass Neutral Density Filters
Glass Neutral Density filters attenuate light by absorption just like the gelatine neutral density filters. Glass ND Filters are more robust and tend to have more uniform absorption characteristics. They also attenuate by absorption and so care must be taken to avoid overheating. Attenuation is achieved by polishing glass ...

Specifications
Attenuator Type: Absorptive
Shape: Square
Size: 50 mm
Optical Density: 0.4
Data Sheet
FNG0250 - Aborptive Glass Neutral Density Filters
Knight Optical (UK) Ltd
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FNG0250 - Aborptive Glass Neutral Density Filters
Glass Neutral Density filters attenuate light by absorption just like the gelatine neutral density filters. Glass ND Filters are more robust and tend to have more uniform absorption characteristics. They also attenuate by absorption and so care must be taken to avoid overheating. Attenuation is achieved by polishing glass ...

Specifications
Attenuator Type: Absorptive
Shape: Square
Size: 50 mm
Optical Density: 0.2
Data Sheet
FNP3050 - Gelatine Neutral Density Filters
Knight Optical (UK) Ltd
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FNP3050 - Gelatine Neutral Density Filters
Neutral density filters attenuate light by a constant amount that is, to first order, independent of the wavelength. Gelatin ND filters are the cheapest but tend to have more fluctuation with wavelength and a narrower wavelength range than glass ND filters and metallic types.  Gelatine neutral density filters work by absorption ...

Specifications
Attenuator Type: Absorptive
Shape: Square
Size: 50 mm
Optical Density: 3.0
Data Sheet
FNP4050 - Gelatine Neutral Density Filters
Knight Optical (UK) Ltd
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FNP4050 - Gelatine Neutral Density Filters
Neutral density filters attenuate light by a constant amount that is, to first order, independent of the wavelength. Gelatin ND filters are the cheapest but tend to have more fluctuation with wavelength and a narrower wavelength range than glass ND filters and metallic types.  Gelatine neutral density filters work by absorption ...

Specifications
Attenuator Type: Absorptive
Shape: Square
Size: 50 mm
Optical Density: 4.0
Data Sheet
FNP2050 - Gelatine Neutral Density Filters
Knight Optical (UK) Ltd
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FNP2050 - Gelatine Neutral Density Filters
Neutral density filters attenuate light by a constant amount that is, to first order, independent of the wavelength. Gelatin ND filters are the cheapest but tend to have more fluctuation with wavelength and a narrower wavelength range than glass ND filters and metallic types.  Gelatine neutral density filters work by absorption ...

Specifications
Attenuator Type: Absorptive
Shape: Square
Size: 50 mm
Optical Density: 2.0
Data Sheet
FNP1050 - Gelatine Neutral Density Filters
Knight Optical (UK) Ltd
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FNP1050 - Gelatine Neutral Density Filters
Neutral density filters attenuate light by a constant amount that is, to first order, independent of the wavelength. Gelatin ND filters are the cheapest but tend to have more fluctuation with wavelength and a narrower wavelength range than glass ND filters and metallic types.  Gelatine neutral density filters work by absorption ...

Specifications
Attenuator Type: Absorptive
Shape: Square
Size: 50 mm
Optical Density: 1.0
Data Sheet
581FDS50 - Dichroic Shortpass Filters
Knight Optical (UK) Ltd
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581FDS50 - Dichroic Shortpass Filters
Shortpass filters are designed to transmit wavelengths lower than the cut off point and reflect all higher wavelengths. Knight Optical\'s Dichroic filters are comprised of a thin-film dielectric coating on glass, resulting in sharp transitions between the transmitted and reflected bands. With negligible absorption, this type of ...

Specifications
Diameter: 0 mm
Thickness: 1.1 mm
Transmission Wavelength Range: 390-580nm
Cut-Off Wavelength: 580 nm
Transmission: 95 %
...
Data Sheet
450FDS25 - Dichroic Shortpass Filters
Knight Optical (UK) Ltd
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450FDS25 - Dichroic Shortpass Filters
Shortpass filters are designed to transmit wavelengths lower than the cut off point and reflect all higher wavelengths. Knight Optical\'s Dichroic filters are comprised of a thin-film dielectric coating on glass, resulting in sharp transitions between the transmitted and reflected bands. With negligible absorption, this type of ...

Specifications
Diameter: 12.5 mm
Thickness: 1.1 mm
Transmission Wavelength Range: 374-449nm
Cut-Off Wavelength: 449 nm
Transmission: 95 %
...
Data Sheet
510FDS12 - Dichroic Shortpass Filters
Knight Optical (UK) Ltd
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510FDS12 - Dichroic Shortpass Filters
Shortpass filters are designed to transmit wavelengths lower than the cut off point and reflect all higher wavelengths. Knight Optical\'s Dichroic filters are comprised of a thin-film dielectric coating on glass, resulting in sharp transitions between the transmitted and reflected bands. With negligible absorption, this type of ...

Specifications
Diameter: 12.5 mm
Thickness: 1.1 mm
Transmission Wavelength Range: 370-563nm
Cut-Off Wavelength: 563 nm
Transmission: 95 %
...
Data Sheet
500FDS50 - Dichroic Shortpass Filters
Knight Optical (UK) Ltd
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500FDS50 - Dichroic Shortpass Filters
Shortpass filters are designed to transmit wavelengths lower than the cut off point and reflect all higher wavelengths. Knight Optical\'s Dichroic filters are comprised of a thin-film dielectric coating on glass, resulting in sharp transitions between the transmitted and reflected bands. With negligible absorption, this type of ...

Specifications
Diameter: 0 mm
Thickness: 1.1 mm
Transmission Wavelength Range: 368-500nm
Cut-On Wavelength: 500 nm
Transmission: >95% %
...
Data Sheet
490FDS50 - Dichroic Shortpass Filters
Knight Optical (UK) Ltd
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490FDS50 - Dichroic Shortpass Filters
Shortpass filters are designed to transmit wavelengths lower than the cut off point and reflect all higher wavelengths. Knight Optical\'s Dichroic filters are comprised of a thin-film dielectric coating on glass, resulting in sharp transitions between the transmitted and reflected bands. With negligible absorption, this type of ...

Specifications
Diameter: 0 mm
Thickness: 1.1 mm
Transmission Wavelength Range: 373-490nm
Cut-Off Wavelength: 490 nm
Transmission: 95 %
...
Data Sheet
500FDS25 - Dichroic Shortpass Filters
Knight Optical (UK) Ltd
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500FDS25 - Dichroic Shortpass Filters
Shortpass filters are designed to transmit wavelengths lower than the cut off point and reflect all higher wavelengths. Knight Optical\'s Dichroic filters are comprised of a thin-film dielectric coating on glass, resulting in sharp transitions between the transmitted and reflected bands. With negligible absorption, this type of ...

Specifications
Diameter: 25.0 mm
Thickness: 1.1 mm
Transmission Wavelength Range: 370-500nm
Cut-Off Wavelength: 500 nm
Transmission: 95 %
...
Data Sheet
570FDS12 - Dichroic Shortpass Filters
Knight Optical (UK) Ltd
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570FDS12 - Dichroic Shortpass Filters
Shortpass filters are designed to transmit wavelengths lower than the cut off point and reflect all higher wavelengths. Knight Optical\'s Dichroic filters are comprised of a thin-film dielectric coating on glass, resulting in sharp transitions between the transmitted and reflected bands. With negligible absorption, this type of ...

Specifications
Diameter: 12.5 mm
Thickness: 1.1 mm
Transmission Wavelength Range: 385-573nm
Cut-Off Wavelength: 573 nm
Transmission: 95 %
...
Data Sheet