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CLDF
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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).

◦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.

Related product
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Technical Data
Documents/Downloads
Guide

▶Different size, wavelength and deviation ratio that are not mentioned on-line or in our catalog are available as custom products upon on request.
▶For a specific filter holder, please contact our Sales Division.
▶Please refer to here for Wavelength Characteristic Data (Reference Data, EXCEL file format).

Attention

▶The transmittance graph drops on the long side of the visible range when the incident angle is slightly slanting.
▶When placing the filter too close to a light source, the heat absorption may damage the filter due to a rapid change of the temperature.
▶The backside of the cold filter is not coated with AR. The absorption filter may have a backside reflectance value of 4%, a total of 20% of loss can occurred.

Common Specifications
MaterialHeat Absorbing glass
Incident angle
Wavelength Range400 - 2000nm(Wavelength above 900nm is brocked )
Surface Quality (Scratch-Dig)60-40
Clear apertureCircle of 90% of the diameter or Circle inscribed in a square of 90% of the dimensions
Outline Drawing

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Schematic

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Typical Transmittance Data

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T: Transmission

Part Number

Catalog PDF

dxf

STP

IGS

SAT

Zemax

CLDF-50S

Part Number
High transmittance range (normal incident) Transmittance (normal incident) Cutoff range (normal incident) Transmittance of cutoff range (normal incident) Wavelength at 50%
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    JP Yen Stock Qty
CLDF-50S

400 - 600nm

>80%

800 - 2000nm

<10%

700±20nm

RoHS  

¥15,000

IN STOCK