DEFORMABLE MIRROR Russian patent published in 2015 - IPC G02B26/00 

FIELD: physics, optics.

SUBSTANCE: invention relates to adaptive optics. A deformable mirror includes an elastic reflecting plate, the profile of which on the back side has a variable thickness, as well as deformation means in the form of a piezoceramic column. The elastic plate is square-shaped with sides measuring $$2a\times 2a,$$ where $$a$$ is the radius of the corrected beam, and is linked to a chassis on two parallel sides. The thickness of the elastic plate in sections parallel to said sides is constant, and in the perpendicular direction satisfies the law: $$\frac{dz}{dx}=-\frac{8x{\text{ e}}^{{\text{x}}^{\text{2}}}-(8x^3-12x){(\alpha +\beta \sin z)}^3}{2(1-2x^2)\beta \cos z},$$ where $$z=\frac{h(x)}{h_{\max }}$$ $$x=\frac{r}{a};$$ h(x) is the variable thickness of the plate; h_max is the structurally determined maximum thickness of the plate; r is the current coordinate along the surface of the elastic plate; $$\alpha =\mathrm{0,5}\frac{h_{\max }+h_{\min }}{h_{\max }};$$ $$\beta =\mathrm{0,5}\frac{h_{\max }-h_{\min }}{h_{\max }};$$ h_min is the minimum allowable thickness. At the centre of the elastic plate, in parallel to the fixed sides, there is a rib with a height L≥h_max, rigidly linked to the plate, one end of which is pivotally linked to a chassis and lies at a distance of $$1,484a$$ from the centre of the elastic plate. A piezoceramic column is pivotally linked to the rib at a point which coincides with the centre of the elastic plate, and additionally includes a rotary drive and a fixed base. The axis of the rotary coincides with the centre of the elastic plate.

EFFECT: high accuracy of phase compensation of thermal distortion of a laser beam in the atmosphere, smaller dimensions.

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