  Advancements in making high-efficiency actuators are an enabling technology
for building the next generation of large-format deformable mirrors. The
Netherlands Organization for Applied Scientific Research (TNO) has developed a
new style of variable-reluctance actuator that requires approximately eighty
times less power to operate as compared to the traditional style of voice-coil
actuators. We present the performance results from laboratory testing of TNO's
57-actuator large-format deformable mirror from measuring the influence
functions, linearity, hysteresis, natural shape flattening, actuator
cross-coupling, creep, repeatability, and actuator lifetime. We measure a
linearity of 99.4 +- 0.33% and hysteresis of 2.10 +- 0.23% over a stroke of 10
microns, indicating that this technology has strong potential for use in on-sky
adaptive secondary mirrors (ASMs). We summarize plans for future lab prototypes
and ASMs that will further demonstrate this technology.
