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Products Category: Optical Thin Film filters

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Shortwave Pass

Short pass Filters separate wavelength regions by transmitting the shorter wavelengths whilst reflecting longer wavelengths. Both portions of light can be utilised. The position of the filter is defined by the transition or ‘half power’ wavelength. The width of the transmission and reflection zones can be specified independently as can the steepness of the transition […]

Longwave Pass

Long pass Filters separate wavelength regions by reflecting the shorter wavelengths whilst transmitting longer wavelengths. Both portions of light can be utilised. The position of the filter is defined by the transition or ‘half power’ wavelength. The width of the transmission and reflection zones can be specified independently as can the steepness of the transition […]

Bandpass Filter

Bandpass Filters select a very specific range of light by transmission. This Band can range from very narrow (<1% of the wavelength) to relatively wide (>10% of the wavelength). The unwanted wavelengths are blocked by reflection, absorption or a combination of both. Such Filters are specified by Central Wavelength (CW), Bandwidth (FWHM), Peak Transmission, and […]

Notch Filter

Notch Filters or ‘Minus Filters’ are used to remove selected unwanted wavelengths, such as laser lines, by reflection. High transmission values in the adjacent passbands and steep transition edges are often necessary to maximise the required wavelengths. Notch widths can be produced to suit the application requirements. Steep transition edges with low ripple and high […]

High Reflector

High Reflectors or Dielectric Mirrors are used to steer light by reflection. The reflectivity is normally higher than that obtained with metallic mirrors. They can be for a single wavelength, multiple wavelengths or broadband in nature. Normally the performance outside the reflective area is not specified. If it is specified it falls under the products […]

Beam Splitters

Beam splitters separate light into two parts; transmitted (T) and reflected (R), both of which can be utilised. The ratio of R:T can be chosen and can be R:T or T:R depending on the optical path (typically values are 50:50, 75:25, 80:20). The operational wavelength region can be selected from the range 200-8000nm to suit […]

Anti-reflection Coatings

Anti-reflection or AR Coatings are applied to surfaces to minimise unwanted reflections within an optical system. Such coatings also increase the transmission or throughput. These AR coatings address a range of requirements: Single layers for modest reflection reduction, Wavelength specific high performance, Multilayer for broadband reflection reduction and Multiwaveband high performance. Such coatings are available […]

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Latest News

  • How are custom optical thin film filters different?

    21st January 2019
  • Optical resin and glass filters – the best of both worlds

    10th December 2018

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