UV + IR absorption filters-Glass type These solid UV and IR Colour Glass Filters achieve high absorption of unwanted UV and IR wavelengths at relatively low cost. The following thickness has been chosen for average absorbsion in relation to filter type, however if you require any other wavelength we can make simple calculations in relation to the thickness to achieve your required wavelength.
Knight Optical > Filters > UV + IR absorption filters - Glass type Long-pass filters This is the section containing Long-pass filters. Only UK and EU customers are charged VAT at 17.5%, customers outside the EU and EU customers based outside the UK who have a valid EU VAT number will not be charged VAT Bulk Discounts! Where (B) appears next to a price below, bulk prices are available, click the (B) button to view! Knight Optical > Filters > UV + IR absorption filters - Glass type
Specification   Material: Schott Colour Glass Material Data : (see materials section) Diameter: +0.0 / -0.2 mm Length/width: ± 0.2 mm Thickness: ± 0.2 mm Surface quality: <60-40 Flatness: <2.5λ over 90% test area Parallelism: <3 arcmin
Note Wavelength listed in table is transition wavelength (T=Tmax/2) for long-pass and short-pass filters. Specific requirements We can manufacture Schott Colour-glass filters to any size at short notice, so if your requirements are not listed please contact us by telephone / fax or email: stockrequirement@knightoptical.co.uk Options available   · AR Coating   · Cutting down or edged to special shapes and sizes   · Mounting (circles) Technical Data Sheets Are available for each filter (see materials section) See also Glass neutral density filters Schott colour-glass filters Heat-glass filters For storage boxes (see accessories)