Open Access
Table 1.
Average end-to-end transmission in H and K bands broken down into individual components.
| HiRISE H |
CRIRES+ H | HiRISE K |
CRIRES+ K | |||
|---|---|---|---|---|---|---|
| Baseline | Upgrade | Standalone | Baseline | Upgrade | Standalone | |
| Atmosphere | 91.2% | 91.2% | 75.4% | 75.4% | ||
| Telescope | 79.8% | 79.8% | 80.6% | 80.6% | ||
| SPHERE CPI | 47.3% | 58.8% | – | 36.8% | 58.1% | – |
| Coronagraph (APLC) | 48.6% | – | 48.6% | – | ||
| Coronagraph (CLC) | 84.6% | – | 84.6% | – | ||
| FIM optics | 71.0% | – | 71.0% | – | ||
| Fiber coupling (no coro.) | 66.7% | – | 71.5% | – | ||
| Fiber coupling (APLC) | 59.2% | – | 63.2% | – | ||
| Fiber coupling (CLC) | 56.3% | – | 60.1% | – | ||
| Fiber transmission | 78.2% | – | 83.6% | – | ||
| FEM optics | 80.0% | – | 80.0% | – | ||
| Slit efficiency | 93.0% | 65.7% | 93.0% | 72.6% | ||
| CRIRES+ | 20.0% | 20.0% | 20.0% | 20.0% | ||
| Total (no coro.) | 1.90% | 2.36% | 9.56% | 1.41% | 2.23% | 8.82% |
| Total (APLC) | 0.82% | 1.02% | – | 0.61% | 0.96% | – |
| Total (CLC) | 1.35% | 1.68% | – | 1.00% | 1.59% | – |
Notes. The baseline case uses current SPHERE dichroics. The upgrade case assumes a clear plate instead of less efficient SPHERE dichroics. For coronagraphic and fiber coupling transmission factors only one of each applies.
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