Basket (0)
Knight Optical(UK) Ltd - sales@knightoptical.co.uk - +44 (0)1622 859444

Dichroic longpass filters

What are you looking for in Stock?

Knight Optical’s complete range of cost effective longpass dichroic filters offer superior transmission, reflection and absorption characteristics.

 

Longpass filters are designed to transmit wavelengths higher than the cut on point and reflect all lower wavelengths. These dichroic longpass filters consist of thin-film dielectric coatings on glass with sharp transitions between the transmitted and reflected bands. Having negligible absorption they are suitable for high powers and do not show the strong fluorescence of certain glass filters.

Our dichroic longpass filters are available in a range of wavelengths and are supplied in standard 12.5mm and 25mm diameter or 50mm square types. We are happy to cut and edge filters for non standard sizes to suit your application.

Material: Borosilicate or equivalent, Sodalime
Diameter: +0.0 / -0.20 mm
Length / width: ± 0.25 mm
Thickness: ± 0.20 mm
Surface quality: <60-40 scratch/dig
Wavelengths: 300-1200nm dependant on type
Wavelength accuracy: +/-5nm
Transmission: Tmax=95% dependant on type and substrate

Note:
Wavelength cut-on listed in table is transition cut-on wavelength (T=Tmax/2)
Wavelength cut-off listed in table is transition cut-off wavelength (T=Tmax/2)

  • Available size: Square 7mm-300mm, Diameter 10mm-400mm
  • Cutting down or edged to special shapes and sizes at short notice
  • Mounting of diameters and squares
  • Available in sets, supplied in a wooden storage box for research and laboratory use

Stock Optics

Get a Custom Quote

Part No. Wavelength cut-on (nm) AOI=0°Wavelength cut-on (nm) AOI=45°Peak Transmission (%T)Diameter
(mm)
Length
(mm)
Width
(mm)
Thickness
(mm)
Material Price
(Ex.VAT)
Buy
740FDL12 Download 750700> 95%12.51.1Borosilicate £15.75
510FDL50 Download 510488> 95%50.050.01.1Borosilicate £29.95
490FDL50 Download 490471> 95%50.050.01.1Borosilicate £29.95
600FDL25 Download 600568> 95%25.01.1Borosilicate £18.65
581FDL12 Download 581549> 95%12.51.1Borosilicate £15.75
530FDL50 Download 530505> 95%50.050.01.1Borosilicate £29.95
540FDL12 Download 540512> 95%12.51.1Borosilicate £15.75
480FDL12 Download 480462> 95%12.51.1Borosilicate £15.75
420FDL12 Download 420405> 95%12.51.1Borosilicate £15.75
521FDL25 Download 521499> 95%25.01.1Borosilicate £18.65
635FDL50 Download 635602> 95%50.050.01.1Borosilicate £29.95
635FDL25 Download 635602> 95%25.01.1Borosilicate £18.65
530FDL12 Download 530505> 95%12.51.1Borosilicate £15.75
500FDL50 Download 500480> 95%50.050.01.1Borosilicate £29.95
645FDL12 Download 645613> 95%12.51.1Borosilicate £15.75
645FDL25 Download 645613> 95%25.01.1Borosilicate £18.65
645FDL50 Download 645613> 95%50.050.01.1Borosilicate £29.95
655FDL12 Download 655620> 95%12.51.1Borosilicate £15.75
521FDL50 Download 521499> 95%50.050.01.1Borosilicate £29.95
420FDL50 Download 420405> 95%50.050.01.1Borosilicate £29.95
600FDL50 Download 600568> 95%50.050.01.1Borosilicate £29.95
615FDL12 Download 615583> 95%12.51.1Borosilicate £15.75
615FDL25 Download 615583> 95%25.01.1Borosilicate £18.65
615FDL50 Download 615583> 95%50.050.01.1Borosilicate £29.95
625FDL12 Download 625589> 95%12.51.1Borosilicate £15.75
625FDL25 Download 625589> 95%25.01.1Borosilicate £18.65
625FDL50 Download 625589> 95%50.050.01.1Borosilicate £29.95
635FDL12 Download 635602> 95%12.51.1Borosilicate £15.75
581FDL25 Download 581549> 95%25.01.1Borosilicate £18.65
581FDL50 Download 581549> 95%50.050.01.1Borosilicate £29.95
590FDL12 Download 590562> 95%12.51.1Borosilicate £15.75
590FDL25 Download 590562> 95%25.01.1Borosilicate £18.65
590FDL50 Download 590562> 95%50.050.01.1Borosilicate £29.95
600FDL12 Download 600568> 95%12.51.1Borosilicate £15.75
540FDL50 Download 540512> 95%50.050.01.1Borosilicate £29.95
550FDL12 Download 550523> 95%12.51.1Borosilicate £15.75
550FDL25 Download 550523> 95%25.01.1Borosilicate £18.65
550FDL50 Download 550523> 95%50.050.01.1Borosilicate £29.95
565FDL12 Download 565539> 95%12.51.1Borosilicate £15.75
565FDL25 Download 560539> 95%25.01.1Borosilicate £18.65
565FDL50 Download 560539> 95%50.050.01.1Borosilicate £29.95
540FDL25 Download 540512> 95%25.01.1Borosilicate £18.65
740FDL25 Download 750700> 95%25.01.1Borosilicate £18.65
740FDL50 Download 750700> 95%50.050.01.1Borosilicate £29.95
530FDL25 Download 530505> 95%25.01.1Borosilicate £18.65
510FDL12 Download 510488> 95%12.51.1Borosilicate £15.75
490FDL25 Download 490471> 95%25.01.1Borosilicate £18.65
480FDL25 Download 480462> 95%25.01.1Borosilicate £18.65
490FDL12 Download 490471> 95%12.51.1Borosilicate £15.75
480FDL50 Download 480462> 95%50.050.01.1Borosilicate £29.95
420FDL25 Download 420405> 95%25.01.1Borosilicate £18.65
500FDL12 Download 500480> 95%12.51.1Borosilicate £15.75
500FDL25 Download 500480> 95%25.01.1Borosilicate £18.65
655FDL50 Download 655620> 95%50.050.01.1Borosilicate £29.95
655FDL25 Download 655620> 95%25.01.1Borosilicate £18.65
521FDL12 Download 521499> 95%12.51.1Borosilicate £15.75
510FDL25 Download 510488> 95%25.01.1Borosilicate £18.65
798FDL12 798751> 95%12.51.1Sodalime £15.75

Get a Custom Quote

Get in touch

Our Multi-Lingual Sales Team are here to help with your requirments:

UK +44 (0)1622 859444
UK +44 (0)1622 850614
UK +44 (0)1622 851078
US +001 401-583-7846

International Shipping

We are able to ship to most countries at good rates, please click here for more info.

This site requires cookies in order to work properly. By continuing to use this site you are agreeing to our cookies policy.

Accept