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