Figure 5
(a) Measured slope error along the length of the flat SiO2 mirror (25 mm thick). The initial r.m.s. slope error is 0.51 (12) µrad. (b) Measured slope error along the length of the same SiO2 mirror due to bending into a parabola. The final r.m.s. slope error is 1.07 (20) µrad. |