Filters
Optical filters mostly belong to one of two categories. The simplest, physically, is the absorptive filter; then there are interference or dichroic filters. Optical filters selectively transmit light in a particular range of wavelengths, that is, colours, while absorbing the remainder. They can usually pass long wavelengths only (longpass), short wavelengths only (shortpass), or a band of wavelengths, blocking both longer and shorter wavelengths (bandpass). The passband may be narrower or wider; the transition or cutoff between maximal and minimal transmission can be sharp or gradual. There are filters with more complex transmission characteristic, for example with two peaks rather than a single band; these are more usually older designs traditionally used for photography; filters with more regular characteristics are used for scientific and technical work. Optical filters are commonly used in photography (where some special effect filters are occasionally used as well as absorptive filters), in many optical instruments, and to colour stage lighting. In astronomy optical filters are used to restrict light passed to the spectral band of interest, e.g., to study infrared radiation without visible light which would affect film or sensors and overwhelm the desired infrared. Optical filters are also essential in fluorescence applications such as fluorescence microscopy and fluorescence spectroscopy. On the other hand optical filters now are used in different types of colorblind glasses for example enchroma. Photographic filters are a particular case of optical filters, and much of the material here applies. Photographic filters do not need the accurately controlled optical properties and precisely defined transmission curves of filters designed for scientific work, and sell in larger quantities at correspondingly lower prices than many laboratory filters.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Material [Types:Bandpass filter] | Fused silica;N-BK7 |
| Dimensions [Types:Bandpass filter] | 10mm~100mm |
| Surface quality [Types:Bandpass filter] | S-D 40-20; S-D 60-40 |
| Parallelism [Types:Bandpass filter] | <3arcmin |
| Clear aperture [Types:Bandpass filter] | >85% of dimensions |
| Bevel [Types:Bandpass filter] | protective bevel as needed |
| Coating process [Types:Bandpass filter] | IAD hard coating |
| CWL [Types:Bandpass filter] | 280nm;365nm;405nm;450nm;546;630nm;808nm;850nm;1064nm etc |
| FWHM [Types:Bandpass filter] | 10nm+/-2nm |
| T peak [Types:Bandpass filter] | 15%~90% |
| Blocking [Types:Bandpass filter；200nm~1200nm] | OD4@200nm~1200nm |
| Standard [Types:Bandpass filter] | MIL-PRF-13830B |
| Material [Types:Absorptive Neutral Density filter] | Color glass |
| Dimensions [Types:Absorptive Neutral Density filter] | 10mm~100mm |
| Thickness tolerance [Types:Absorptive Neutral Density filter] | +/-0.5mm |
| Flatness [Types:Absorptive Neutral Density filter；632.8nm] | Power<1λ@632.8nm |
| Surface quality [Types:Absorptive Neutral Density filter] | S-D 60-40 |
| Parallelism [Types:Absorptive Neutral Density filter] | <3arcmin |
| Clear aperture [Types:Absorptive Neutral Density filter] | >85% of dimensions |
| Bevel [Types:Absorptive Neutral Density filter] | protective bevel as needed |
| Coating wavelength [Types:Absorptive Neutral Density filter] | @400-700nm |
| OD value [Types:Absorptive Neutral Density filter] | 0.1~3.0 |
| Standard [Types:Absorptive Neutral Density filter] | MIL-PRF-13830B |
| Material [Types:Reflective Neutral Density filter] | Float glass |
| Dimensions [Types:Reflective Neutral Density filter] | 10mm~100mm |
| Thickness tolerance [Types:Reflective Neutral Density filter] | +/-0.5mm |
| Surface quality [Types:Reflective Neutral Density filter] | S-D 80-50 |
| Parallelism [Types:Reflective Neutral Density filter] | <3arcmin |
| Clear aperture [Types:Reflective Neutral Density filter] | >85% of dimensions |
| Bevel [Types:Reflective Neutral Density filter] | protective bevel as needed |
| Coating wavelength [Types:Reflective Neutral Density filter] | coating Ni-Cr@400-700nm |
| OD value [Types:Reflective Neutral Density filter] | 0.1~3.0 |
| Standard [Types:Reflective Neutral Density filter] | MIL-PRF-13830B |
Datasheet
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Supplier Information
Related Products
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Optical-glass neutral-density filter Optical Filters Uni-lens
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Neutral-density filters make photographic exposure easy to control. By blocking light from reaching the camera sensor, they allow the camera to maintain a larger aperture for longer.
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A bandpass filter passes frequencies within a specified range and rejects or attenuates frequencies outside it, selectively transmitting part of the spectrum while rejecting all other wavelengths.
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