Cold Filters


Cold Filters
In stock
The principle of the cold filter is similar to the glass that is used in a halogen lamp to protect the heat. It enables the visible range to transmit and cut-off the IR range (heat).
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Cold Filter 50mm 700nm
2 weeks
Material Heat Absorbing glass
Incident angle
Wavelength Range 400 - 2000nm(Wavelength above 900nm is brocked )
Surface Quality (Scratch-Dig) 60-40
Clear aperture Circle of 90% of the diameter or Circle inscribed in a square of 90% of the dimensions
High transmittance range <br>(normal incident) 400 - 600nm
Transmittance <br>(normal incident) >80%
Cutoff range <br>(normal incident) 800 - 2000nm
Transmittance of cutoff range <br>(normal incident) <10%
Wavelength at 50% 700±20nm

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◦The feature of the dielectric optical coating filter is to have a steep decline of transmittance from the visible range to IR range. In addition to this; the heat absorption filter is efficient for transmitting at the visible range and cutting off the IR range.
◦It is frequently used as a IR cut filter on a CCD sensor.
◦It is also used as a filter to cut-off the heat from the illumination in a biological microscope to avoid heating up the specimen.

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