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31 May 1994 Wavefront compensation using active lenses
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Wavefront correctors used in astronomical telescopes today are usually zonally controllable devices such as deformable or segmented mirrors, having a large number of independently adjustable actuators. In this paper we describe an entirely different approach, using intrinsically rigid optical components such as small lenses or mirrors, which are displaced and tilted to implement the wavefront correction, each element spanning the aperture at a reduced beam diameter. Modal corrections approximating Zernike polynomials can be produced with five degrees of freedom: linear displacements along the x, y and z axes, plus rotation about the x and y axes. This approach provides a simple and efficient method for low-order wavefront compensation. In some cases the active elements may replace existing optical components.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John W. Hardy and Edward P. Wallner "Wavefront compensation using active lenses", Proc. SPIE 2201, Adaptive Optics in Astronomy, (31 May 1994);

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