- Dichroic colour filters
- Short pass filters
- Band pass filter
- Long pass filters
- ND filters: reflective & absorptive
Elliot Scientific Neutral Density Filters attenuate light in the visible spectrum by absorption within the glass. Different filters can be stacked to achieve intermediate densities not available in the standard range.
Elliot Scientific reflective neutral density filters attenuate by a partially reflective vacuum deposited coating. This metallic film offers a broader and more consistent neutral density which is ideal for use in laser projects due to its non-absorption. Filters can be stacked, but care needs to be taken to ensure there are no multiple reflection effects. These can be eliminated by slightly tilting the stack. A useful feature of this type of filter is that it can be used as a beamsplitter.
Elliot Scientific Schott Short Pass Filters block undesired longer wavelengths. The BG series are blue or blue/green in colour, while the KG series are virtually colourless and ideal for blocking heat, especially from lamps.
Elliot Scientific Schott Band Pass filters are designed to pass a specific wavelength range. The BG series offer transmission in the central part of the visible spectrum, while the UG range are practically black in colour and are designed for work in the UV. Applications include UV illumination & excitation, fluorescence microscopy, sterilization equipment, sensitivity correction, CCD colour correction, airport lighting, and laser safety.
Elliot Scientific Schott Long Pass Filters are designed to block shorter wavelengths such as blue and green. Deep red to almost black filters are ideal for IR transmission. Applications include airport lighting, laser safety, sensor applications, infrared surveillance systems, and barcode readers.