Table 3: Expected performance of the AMBER design based on the optical study described in this paper.
Contrast level 80% to 90% in K (R = 35)
  Static achromatic OPD equality   $\pm 4 \mu$m
  Tilt errors   $\pm$ 3''
  WF quality   140 nm ($\lambda $/16 rms @ 2.2 $\mu $m)
  Differential polarization (after fiber exit)   $\pm 16^\circ $
  Differential fiber axis orientation   $\pm$$3^\circ $
  Bias due to unequal intensity   0.9
Minimal optical throughput of AMBER >2% in K
  Warm optics   $\pm$17%
    Fiber transmission     $\pm$51%
      Fiber coupling       $\pm$81%
      Throughput of the fiber       $\pm$66%
      Coupling degradation factor       $\pm$95%
        Fiber head shift         $\pm$$0.3~\mu$m
        Defocus         $\pm$$4~\mu$m
        Fiber angular inclination         $\pm$$0.5^\circ$
        Optical quality         $\lambda $/10 rms @ 633 nm
        Polarization control         $\pm$$3^\circ $
    Warm optics optical element transmission     $\pm$33%
  SPG   $\pm$39%
  DET   $\pm$62%
Static chromatic OPD $\leq 0.1\mu$m inside the spectral bands
  Relative glass thickness and fiber length   $\approx$$\pm$$500~\mu$m shared out all the transmissive elements
  Optical quality of each element   $\lambda $/5 PTV @ 633 nm
Dynamic chromatic OPD $\leq$ photon noise during 1 min
  Beam angular deviation at the exit of prismatic optics   $\pm$1'' to $\pm$3''
  Relative glass thickness and fiber length   $\approx$$\pm$$500~\mu$m shared out all the transmissive elements
Contrast calibration (P2VM) 3 $\sigma_V=0.01$
  Generated contrast of point-like source   >75%
  Contrast knowledge accuracy   10-3
Dimensioning  
  VLTI AMBER interface    
    Beam size     18 mm
    Beam height adjustment accuracy     $\pm$0.3 mm
    Beam separation adjustment accuracy     $\pm$0.3 mm
  SPG warm optics: interface    
    Beam size and separations (no anamorphosis)     See Fig. 7
    Anamorphosis factor     15.6
    Pupil transverse location accuracy     $\pm$$250~\mu$m in the anamorphosis direction
          $\pm$$16~\mu$m in the other one
    Image transverse location accuracy     $\pm$$5~\mu$m in the anamorphosis direction


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