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Our TECHSPEC® Dichroic Longpass Filters are designed for a 45° angle of incidence. The rejected light is reflected at 90°, making these filters ideal for use in fluorescence applications or as spectral beamsplitters. These hard coated filters feature low polarization dependence, broad spectral ranges, and a precision fused silica substrate. Reflection and transmission curves are available to easily integrate TECHSPEC® Dichroic Longpass Filters into any application.
Hard coatings are used to increase durability while maintaining performance. The hard coating provides Dichroic Longpass Filters with high resistance to humidity, temperature, and abrasion, while also reducing the risk of damage when being handled.
| Filter Type | Transmitted Wavefront (RMS) | Surface Quality | Surface Flatness (P-V) |
R(avg) | T(avg) |
|---|---|---|---|---|---|
| HP Dichroic | λ/10 | 40-20 | λ/2 | >98% | >90% |
| Fluorescence Dichroics | 1λ | 60-40 | - | >98% | >90% |
| Dichroic Longpass | λ/4 | 40-20 | - | >97% | >85% |
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