Figure 28: Thermal lensing from a ring radiator. Red dashed curve: nearest paraboloid (weighted
by the readout beam intensity). The readout beam is with w = 2 cm. The curvature is
weakly dependent on the beam width: 87 km W for w = 2 cm, 95 km W for w = 6.65 cm. Green
dashed curve: Zernike expansion of the lens
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