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Light scanner based on a viscoelastic stretchable grating

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Abstract

We present a new technique for light scanning by use of viscoelastic-based deformable phase diffraction gratings. Mechanical stretching of the grating permits control of its spatial period, and thus the orders of diffraction can be spatially deflected. In the experiments the viscoelastic gratings with triangular and rectangular profiles have been characterized at λ=633nm. It is demonstrated that the reversible elongation can exceed 20% of the initial length. For the triangular profile grating, the diffraction angle of the first order changed from 6.6° to 5.4° while the diffraction efficiency remained almost constant at 17%. Dynamic scanning of a laser beam at frequencies of 1kHz is demonstrated by use of electromechanically driven viscoelastic gratings.

© 2005 Optical Society of America

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