Cold Mirror / CLDM
The principle of the cold mirror is reflecting the visible range light and leave the UV range light to transmit. It can separate the visible and the UV (heat) of the sunlight.
Low absorption with a dielectric multi-layer coating using high transmittance glass material and it can be resistant to rapid change in high temperature.Using this produt it is possible to select IR light only.
Can be used as a NIR filter by changing the angle of Incident.
Common Specifications
| Material | B270® (SuperWhite Glass) or BK7 |  |
|---|---|---|
| Incident Angle | 45° | |
| Wavelength Range | 400 - 2000nm | |
| Surface Quality (Scratch-Dig) | 80 − 50、60 − 40 (CLDM-50S) | |
| Clear Aperture | 90% of external dimension of the square inscription circle |
| Schematic | Outline Drawing |
|---|---|
 |
 |
| Square | |||||||
|---|---|---|---|---|---|---|---|
| Part Number | Length A |
Thickness t |
High Transmittance Range (45 degrees incident) |
Transmittance (45 degrees incident) |
Cutoff Range (45 degrees incident) |
Transmittance of Cutoff Range (45 degrees incident) |
Wavelength at 50% |
| CLDM-25.4S3.3 | 25.4±0.5mm | 3.3±0.3mm | 800 - 2000nm | ＞75％ | 420 - 700nm | ＞95％ | 760±10nm |
| CLDM-50.8S3.3 | 50.8±0.5mm | 3.3±0.3mm | 800 - 2000nm | ＞75％ | 420 - 700nm | ＞95％ | 760±10nm |
| CLDM-50S | 50±0.3mm | 1±0.1mm | 800 - 2000nm | ＞80％ | 400 - 700nm | ＞90％ | 760±10nm |
| Circle | |||||||
|---|---|---|---|---|---|---|---|
| Part Number | Diamefer φD |
Thickness t |
High Transmittance Range (45 degrees incident) |
Transmittance (45 degrees incident) |
Cutoff Range (45 degrees incident) |
Transmittance of Cutoff Range (45 degrees incident) |
Wavelength at 50% |
| CLDM-25.4C3.3 | φ25.4±0.5mm | 3.3±0.3mm | 800 - 2000nm | ＞75％ | 420 - 700nm | ＞95％ | 760±10nm |
| CLDM-50.8C3.3 | φ50.8±0.5mm | 3.3±0.3mm | 800 - 2000nm | ＞75％ | 420 - 700nm | ＞95％ | 760±10nm |
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