Dichroic Filter
Dichroic filters block certain wavelengths. They can also be used in another way: different wavelengths can be divided but also combined.
High quality dichroic filters with low-loss may need up to 30 hours in the coating process. In order to achieve a high-quality surface, it is recommended to use a thick substrate.
Nevertheless, there has to be a compromise, because a 45° dichroic filter refracts the beam in the substrate which then causes drifts.
Specification
Type | Dichroic filter |
| Dimensions tolerance | +/- 0.1mm |
| Reflection | > 98-99% |
| Transmission | > 95-98% |
| Clear apterture | > 95% |
Material | BK7/H-K9L |
| Surface quality | 20-10 |
Flatness | > lambda/4 (1.1mm) > lambda/8 (2 & 3.3mm) |
| AOI | 45° |
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Optics
Optic for combining/splitting beams of different wavelengths.
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