Absorptive
Filters: absorb specific wavelengths of light while transmitting
others
Reflective
Filters: reflect the undesired wavelengths while transmitting
the remaining ones
Monochromatic
Filters allow a limited range of wavelength to pass
Neutral
Density (ND) Filters are utilized to reduce the intensity of
light by reflecting or absorbing a percent of light at specific
wavelengths
Color
Glass Filters Specifications
| Material |
Schott optical glass or equivalent |
| Diameter Tolerance |
-0.15 mm |
| Surface Figure |
Commercial Polish |
| Fringes |
1-5 |
| Surface Quality |
60-40 scratch and dig |
| Clear Aperture |
90% of dimension |
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Interference
Filters
Specifications
| Material |
Bk7, (other material upon request) |
| Dimension Tolerance |
- 0.15mm |
| CWL Tolerance |
¡À20% of FWHM |
| Bandwidth Tolerance |
¡À20% of FWHM |
| Minimum Peak transmission |
410-515 nm 50%; 520-1550nm 60% |
| Out of Band Blocking |
<0.01%(X-ray to Far IR) |
| Temperature Range |
-50¡æ to +80¡æ |
| Thickness |
<6 mm |
| Surface Quality |
60/40 scratch and dig |
| Clear Aperture |
>90% of dimension |
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UV
Interference Filters
| Material |
Bk7, (other material upon request) |
| Dimension Tolerance |
- 0.15mm |
| CWL Tolerance |
¡À20% of FWHM |
| Bandwidth Tolerance |
¡À20% of FWHM |
| Out of Band Blocking |
<0.01%(X-ray to Far IR) |
| Clear Aperture |
>90% of dimension |
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Neutral
Density Filters
Neutral Dentral Density
Filters, Metallic Linearly Variable neutral Density Filter, Melallic circularly
variable Neutral Density Filter.
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Note:
Technical specilification is required when ordering.
