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Figure 5
The dynamic radius of curvature of Mirror 1, as measured by a Fizeau interferometer, as a function of time after applying a voltage change of 500 or 1000 V to all piezo electrodes. High-accuracy mode has a voltage slew rate <10 V s−1, and deliberately applies damped sinusoidal voltage oscillations after the main impulse. Fast mode has a voltage slew rate of 50 V s−1. Oscillations and drift rates in the radius of curvature provide important information about how the mirror responds to voltage, and how the holder and electrical connectors constrain it.

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