Filters0 pages
Filters
Optical filters, generally, belong to one of two categories. The
simplest, physically, is the absorptive filter, while our filters are
mainly for dichroic filters. Optical filters selectively transmits light
having certain properties (often, a particular range of wavelengths,
that is, range of colours of light), while blocking the remainder.
I
Attribute
Material
Typical Diameter (<t>mm)
Diameter Tolerance (mm)
Typical Thickness (mm)
Thickness Tolerance (mm)
Clear Aperture
Flatness (per25mm@633nm)
Incidence Angle
Surface Quality
Parallelism
Specification
BK7, K9, Fused Silica, etc.
>2.0mm
±0.02mm
£0.1mm
±0.01mr
>90%
0° or 45°
30 arc seconds
"