Table 1.
Optical components of the VLT and SPHERE CPI visual path.
| Abbr. | Name | r i e p | Comment |
|---|---|---|---|
| VLT telescope | |||
| M1,M2 | Telescope mirrors | r | alt.-az. orientation |
| M3 | Telescope mirror | r | Strong pol. effects |
| CPI common path | |||
| – | Calibration sources | i e | Point and flat field sources, hole grid |
| HWP1 | Half-wave plate 1 | r i p | Rotates M3 pol. |
| PTTM | Pupil tip-tilt mirror | AO, compensates M3 polarization | |
| – | pol. calibration components | i e p | pol. characterization |
| HWP2 | Half-wave plate 2 | r i p | Polarization control and switch |
| DROT | Image derotator | r | Rotates image, strong pol. effects |
| TTM | Tip tilt mirror | AO | |
| DM | Deformable mirror | AO | |
| vi.BS | Beam splitter | Visual-infrared | |
| CPI visual common path | |||
| ADC | Atmospheric dispersion corrector | r | For visual |
| zw.BS | ZIMPOL-WFS beam splitter | e | Gray or dichroic BS |
| Wave front sensor (WFS) arm | |||
| WTTP | WFS tip-tilt plate | Source positioning | |
| SpF | WFS spatial filter | e | AO tuning |
| WFS | WFS-detector | AO tuning | |
| CPI visual coronagraph | |||
| – | Focal plane masks | e | Exchange wheel |
| – | Pupil masks | e | Exchange wheel |
Notes. This incomplete list gives all important components for visual science observations. “Short” are abbreviations as used in this paper and Cols. 3–7 indicate whether the components are rotating (r), insertable (i), exchangeable (e), or/and only inserted for visual polarimetry (p)
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