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Table 1.

Servo-stabilized interferometer system characteristics.

Fabry-Perot interferometer
Manufacturer IC optical systems
Type ET50 FS
Aperture 50 mm
Material Fused silica
(minimal inhomogeneity)
Plate wedge 20 arcmin
Cavity spacing 3.000 mm ± ∼0.005 mm
Coating Multilayer broadband
Wavelength range 400 nm−700 nm
Estimated cavity errors λ/100 (PV @ 632.8 nm, after
coating, over central 35 mm)
Nominal reflectance 95% ± 3%
Estimated step (Δ) ∼0.46 nm
Tilt control estimated precision (X, Y) ∼1.4 × 10−3 arcsec


Manufacturer IC optical systems
Type CS100
Digital resolution (N) 12 bits/4096 steps

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