Abstract

The g44 grating is an electroholographic transmission grating in which the applied field is perpendicular to both the grating vector and the wave vector of the incident beam. It is argued that in this configuration the incident beam traverses through a periodically rotating index ellipsoid. It is shown that in the g44 configuration the Bragg condition is fulfilled for a specific value of the applied field and for a diffracting beam polarization that is perpendicular to that of the incident beam. Consequently, the g44 grating can be used as an electrically controlled filter. Tunability of 7nm is demonstrated in a 2mm thick grating.

© 2006 Optical Society of America

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