FIG. 06.01
Absorptive Neutral Density Filters (Mounted)
Absorbing glass that cuts light evenly across the spectrum, supplied mounted.
Family 06 · 2 types
Optical Filters
Filters pass the light you want and block or attenuate the rest. The range covers interference and coloured-glass filters, plus absorptive and reflective neutral density (ND) filters that cut intensity evenly across the spectrum.
- Types
- 2
- Coating
- In-house
- Quality
- ISO 9001
- Custom
- To drawing
- Since
- 1965
- Made in
- Roorkee
What it does · where it’s used
- Attenuate a beam evenly with neutral density filters
- Isolate a band or a laser line
- Spectroscopy, fluorescence microscopy and colour photography
- Protect detectors and cameras from too much light
Two types.
Open a type for how it works and where it is used. Each can be made in the material and coating you need.
FIG. 06.02
Reflective Neutral Density Filters
A thin metallic coating reflects away a fixed share of the light, evenly across the spectrum.
Filters for colour and wavelength.
- 06.A
Interference filters
Thin-film coatings that transmit a chosen band or laser line and reflect the rest.
- 06.B
Coloured-glass filters
Absorbing glass that transmits some colours and absorbs others. Simple, robust and largely insensitive to angle.
Specify yours.
Start from a catalogue part or from your own drawing, in the material, coating and tolerance grade you need.
AMaterial
- Optical glass (BK7-class crown, flint)
- Fused silica / fused quartz
- Sapphire
- CaF₂
- BaF₂
- MgF₂
- Silicon (Si)
- Germanium (Ge)
- Zinc sulphide (ZnS)
- Zinc selenide (ZnSe)
- Nd:YAG crystal
- Other UV and IR materials
BCoatingIn-house
- ARAnti-reflection
- Al · AgMetallic mirror
- HRDielectric mirror
- Filter
- Beam-splitter
- Polarizing
CTolerance grade
| Parameter | Commercial | Precision |
|---|---|---|
| Thickness | ±0.1 mm | ±0.01 mm |
| Radius | 1% | 0.5% |
| Refractive index | 0.001 | 0.0001 |
| Abbe (V-number) | 1% | 0.1% |
| Centration | 3 arc-min | 30 arc-sec |
| Tilt / wedge | 1 arc-min | 10 arc-sec |
| Surface irregularity | 1 fringe | λ/4 (0.25 fringe) |
| Surface quality (scratch-dig) | 60-40 | 10-5 |
DMade to your drawing
Send your drawing.
A drawing or a short spec is enough. We quote to it.
- Dimensions and tolerances
- Material and coating
- Surface quality
- Quantity
Quote for optical filters.
Tell us the part, material, coating and quantity, or send a drawing. We reply with a quote.