  Space-based stellar coronagraph instruments aim to directly image exoplanets
that are a fraction of an arcsecond separation and ten billion times fainter
than their host star. To achieve this, one or more deformable mirrors (DMs) are
used in concert with coronagraph masks to control the wavefront and minimize
diffracted starlight in a region of the image known as the ``dark zone" or
``dark hole." The DMs must have a high number of actuators (50 to 96 across) to
allow dark holes that are large enough to image a range of desired exoplanet
separations. In addition, the surfaces of the DMs must be controlled at the
picometer level to enable the required contrast. Any defect in the mechanical
structure of the DMs or electronic system could significantly impact the
scientific potential of the mission. Thus, NASA's Exoplanet Exploration Program
(ExEP) procured two 50$\times$50 microelectromechanical (MEMS) DMs manufactured
by Boston Micromachines Corporation (BMC) to test their robustness to the
vibrational environment that the DMs will be exposed to during launch. The DMs
were subjected to a battery of functional and high-contrast imaging tests
before and after exposure to flight-like random vibrations. The DMs did not
show any significant functional nor performance degradation at $10^{-8}$
contrast levels.
