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24 December 2003 Design and operation of an integrated wavefront corrector (IWC)
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Typical adaptive optics systems require a deformable mirror to provide high spatial frequency wavefront correction and a separate tip-tilt mirror so that the deformable mirror’s dynamic range is not exhausted on low order aberrations. Having two correction devices requires additional optical relays to be incorporated in the system, which in turn translates into more cost, size and complexity. If the two devices were combined into an integrated wavefront corrector (IWC), the cost, size and complexity of an adaptive optics system could be drastically reduced. This paper outlines the design and operation of an electro-ceramic driven tip tilt stage that has been designed specifically for a 37 channel deformable mirror. The tip tilt system can deliver more than 500 μradians of tilt, 20 microns of piston, and has natural frequencies greater than 400 hertz. The tip-tilt stage has a fast response time and the axis of rotation is centered at the optical surface. This prevents translation and wavefront shear associated with typical tip-tilt mirrors for which the axis of rotation is centered behind the surface of the mirror. The 37 channel deformable mirror has a 7mm actuator spacing and is designed with high temperature and low outgassing materials which are compatible with high temperature coatings. The IWC may be retrofitted with Xinetics actuators to operate at cryogenic temperatures. We also describe the use of this device in a closed loop adaptive optics system and outline its benefits.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Benjamin West Frazier, Jeff Cavaco, Mark Smith, and Zaffir Chaudhry "Design and operation of an integrated wavefront corrector (IWC)", Proc. SPIE 5169, Astronomical Adaptive Optics Systems and Applications, (24 December 2003);


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