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7 February 2003 Layer-oriented adaptive optics: from drawings to metal
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In order to get first-hand results in the laboratory and possibly on the sky with the Layer-Oriented approach we designed, built, and tested a bread-board for this type of wavefront sensor. This device consists of a single wavefront sensor able to look simultaneously at four references. The positioning of three of the four reference stars with respect to the central one is made by the means of manually adjustable positioning units. A few additional degrees of freedom have been intentionally placed in the system in a way to test the sensitivity of the unit to misplacement and/or misalignment of some optical components. The laboratory set-up includes a crude system to mimic a telecentric F/32 focal plane illuminated by a number of fiber sources that can be placed in several different configurations. Wavefront deformation can be accomplished by placing some fixed deformating plates optically conjugated to several altitudes on the atmosphere. The system is designed in a way to be easily fitted to the existing AdOpt@TNG system, allowing for multiple references, one DM, closed loop operations. Any preliminar result from this activity will be reported. Laboratory experiments includes checking of the theoretical predictions, especially the effectiveness in sensing up to a certain spatial frequency the layers not specifically conjugated to the detector. The results of a demonstrative experiment, showing how the wavefront sensor is able to disentangle layers contribution, are also reported.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jacopo Farinato, Roberto Ragazzoni, Emiliano Diolaiti, Elise Vernet-Viard, Andrea Baruffolo, Carmelo Arcidiacono, Adriano Ghedina, Massimo Cecconi, Pierfrancesco Rossettini, Raffaele Tomelleri, Giuseppe Crimi, and Mauro Ghigo "Layer-oriented adaptive optics: from drawings to metal", Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003);


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