Table 2.
Different throughput terms that are important for the SCAR coronagraph.
| Throughput term | Typical values |
|---|---|
| Theoretical | |
| Geometric lenslet throughput | ∼80% |
| Fiber injection losses | 90%−95% |
| Planet location | 50%−100% |
| Phase plate Strehl reduction | 60%−80% |
| Total | ∼41% |
| Experimental | |
| Phase plate transmission | > 85% |
| Fresnel losses on the fiber | ∼90% |
| Microlens transmission | > 95% |
| Strehl ratio of the AO system | ∼50% |
| Total | ⪆36% |
| Total | ⪆14% |
Notes. A distinction is made between theoretical and experimental terms. Experimental throughput terms will be non-existent with perfect manufacturing, while theoretical throughput terms are unavoidable. Typical values in the visible are shown for each term. The values for the experimental throughput terms are indicative of current technology performance and may increase as technology matures.
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