The making of robust and highly performing imaging spectropolarimeters for large solar telescopes

Open Access

Table A.3

Optical tolerances of the CRISP2 doublet lenses.

Parameter	Tolerance
Radius error	±0.1%
Thickness	±0.1 mm
Form error	±1/3 wavelength
Wedge	±30 seconds of arc
Index error	±0.0002 *
Abbe error	+-0.3% *

Notes. *The index of the glass was measured after purchase, and the system was re-optimised with the measured glass data.

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