Table 1
Coupling with and throughput of apodisation optics.
| (a) Coupling efficiency | (%) |
|
|
|
| Unapodised pupil | 59 |
| Original PIAA design | 91 |
| New PIAA design | 91 |
|
|
|
| (b) Throughput of apodising optics | |
|
|
|
| Unapodised pupil | 100 |
| Original PIAA design | 55 |
| New PIAA design | 96 |
|
|
|
| (c) Combined throughput (a×b) | |
|
|
|
| Unapodised pupil | 59 |
| Original PIAA design | 51 |
| New PIAA design | 87 |
Notes. The table summarises the results from the simulations in Sect. 2. The theoretical coupling efficiencies are shown for three central obstruction sizes with no apodisation, the old PIAA lens design and the new PIAA lens design, for the case of no wavefront aberrations. The throughput of the PIAA lenses is presented as well as the combined throughput of each option, which is based on the throughput of the lenses multiplied by the coupling efficiency for each case.
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