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 […]
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 filters or band-pass filters work by allowing a specific range of wavelengths of light to be transmitted through the filter – they literally ‘pass’ a ‘band’ of wavelengths. The filter allows signals to be transmitted between two frequencies. Some bandpass filters require external sources of power to work such as filter circuits, these are […]
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 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 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 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 […]
