We present the research status of a deformable mirror made of a magnetic liquid whose surface is actuated by a
triangular array of small current carrying coils. We demonstrate that the mirror can correct a 11 μm low order aberrated
wavefront to a residual RMS wavefront error 0.05 μm. Recent developments show that these deformable mirrors can
reach a frequency response of several hundred hertz. A new method for linearizing the response of these mirrors is also
presented.
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