A novel wavefront sensor based on a coherent bundle of single-mode fibres is proposed.Such a sensor holds potential for fast registration and does not require a collinear design.The pros and cons of it, as compared to more conventional sensor designs, is examined inorder to evaluate its potential and to identify possible areas of application. The concept isillustrated with wavefront measurements that have been performed for simplicity with anindividual fibre scanned across the wavefront of interest. We find that the tiny core ofcurrent single-mode fibres is ill suited for general purpose wavefront sensing, but futuredevelopments may make a fibre-based design a liable alternative to current techniques.
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