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Figure 1
Fizeau interferometer measurement of the inverse radius of curvature of three micro-focus bimorph mirrors as a function of time after a 1000 V impulse was applied to the piezoelectric actuators. Mirrors 1 and 2 are old-fashioned bimorph mirrors which drift in curvature over time. Mirror 3, a new optic mounted in a strain-free holder, exhibits significantly less drift and has subsequently been installed on the I24 beamline at Diamond as a horizontally focusing mirror. Curvature data are plotted as a percentage change relative to each mirror's steady state. Stabilization in open loop to within <1% is achieved in 20 s for Mirror 3. This proves that optimized bimorph deformable mirrors are intrinsically capable of being rapidly changed and stabilized in only a few seconds.

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ISSN: 1600-5775
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