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Discover new standards of optics with Knight Optical's Interference Bandpass Filters.

14 Jul 2023

Unlock the true potential of your optical applications with Knight Optical's extraordinary range of interference bandpass filters. Our vast selection is available for direct order from our website and covers the UV, visible, and infrared regions.

Our filters guarantee that only the desired wavelengths enter or exit your system, offering unrivalled control and exceptional performance.

Our comprehensive catalogue of bandpass filters includes:

● UV filters: Centre wavelengths ranging from 214-400nm.
● Visible bandpass filters: Centre wavelengths between 400-700nm.
● Near-infrared filters: Centre wavelengths up to 2000nm.
● ANPR/ALPR filters: Optimized for commonly used LED lights at 740nm, 850nm, 870nm, and 940nm, achieving a peak transmission above 85%.
● Fluorescence filters: Sets of excitation and emission bandpass filters for specific fluorophores such as CY5, TRITC, and DAPI.

Our bandpass filters, available in diameters of 12.5mm, 25mm, and 50mm, offer varying bandwidths (FWHM) from 3nm up to 70nm, allowing you to tailor your optical setup to perfection.

Below are the specifications for our standard interference filters:

Diameter & Aperture (mm):
12.5mm ± 0.2 (8.5mm aperture)
25.0mm ± 0.2 (21mm aperture)
50.0mm ± 0.2 (46mm aperture)

Thickness (mm):
6.1mm +/-0.2

OD4 @ 200nm to 1150nm (CWL less than 380nm)
OD5 @ 200nm to 1150nm (CWL between 380nm and 1064)
OD5 @ 200nm to 1850nm (CWL between 1080nm and 1640)

CWL Tolerance (nm):
± 20% of FWHM

HBW Tolerance (nm):
± 20% of FWHM

Edge Treatment:
Mounted in a black anodized aluminium ring

Surface Quality:

Usable Temperature Limits:
-50°C to +80°C

All filters are scribed and hermetically sealed to ensure maximum long-term stability.

Knight Optical is also renowned for providing custom solutions to our customers and this extends to our interference bandpass filters.

Each filter undergoes rigorous testing in our state-of-the-art in-house metrology laboratory, equipped with the cutting-edge Agilent Cary 7000 to ensure their excellence in spectral performance, including transmission and out-of-band blocking.

For infrared bandpass filters, our Cary 660 FTIR guarantees precise evaluations, ideal for gas band filters within the infrared range. Trust Knight Optical for bespoke solutions that surpass expectations.

Contact our UK and US teams today and experience true precision, quality and innovation. 

Europe, UK, Asia & RoW:
Email: info@knightoptical.co.uk
Telephone: +44 (0)1622 859444

USA & Canada:
Email: usasales@knightoptical.com
Telephone: +1 401-583-7846

Knight Optical Ltd
Roebuck Business Park
ME17 1AB
United Kingdom
Tel: 44 (0)1622 859444
Fax: 44 (0)1622 859 555
Email Us
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