Influence of low temperature on the surface deformation of deformable mirrors

You Juncheng^{1, 2, 3}, Guan Chunlin^{1, 2, †}, Zhou Hong^{1, 2}

(color online) Results of tests: (a) K4 DM, (b) optimized K4 DM, (c) ULE DM, and (d) optimized ULE DM. First column is the surface of DMs at 20 °C; second column is the surface of DMs at −20 °C; third column is the surface deformation of DMs at −20 °C.