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Simulational and experimental investigation on the dynamic high frequency aberration of the deformable mirror

2017; Optica Publishing Group; Volume: 25; Issue: 26 Linguagem: Inglês

10.1364/oe.25.032853

1094-4087

Licheng Sun, Lei Huang, Yan Meng, Junbiao Fan, Yamin Zheng, Chuang Sun,

Optical Coherence Tomography Applications

The dynamic high frequency aberration (HIFA) only emerges in the compensation process in adaptive optics (AO) systems. The static surface shape of a deformable mirror (DM), which is ensured perfectly smooth by various reported techniques, cannot be used to figure out whether the HIFA exist or not. The dynamic HIFA of the DM, which has not been studied systematically up to now, is investigated theoretically and experimentally in this paper. The mechanism of the dynamic HIFA of the DM is presented in the simulation. Analysis results indicate that the tilted actuators results in shear displacements on the DM’s surface shape and thus lead to the dynamic HIFA. The tilt mode of the DM is proposed to describe the surface shape patterns under different tilt conditions. In the experiment, the dynamic HIFA is identified and the tilt modes are exactly recognized on the manufactured DM with tilted actuators, while the correction ability and the fitting residual of this DM are verified to be much worse than that of an ideal DM. Our investigations could help researchers effectively recognize and depress the dynamic HIFA in their own DMs, which could ensure the high precision aberration control during the compensation process of AO system.