Abstract

To investigate the beam dependence of a fiber-optic voltage sensor by using a LiNbO3 crystal, I undertook a series of calculations of various beam conditions expressed as Gauss functions by using the plane-wave method, treating each linear electro-optic term as a perturbation of the birefringence of a uniaxial crystal caused by an off-axis beam. The approximation proved to be accurate to within 0.2%. I discovered that the performance of the sensor is closely dependent on the beam angle from the z axis and the beam angle on the xy plane but that its fabrication requires an impractical degree of control of the collimated beam. I also found the optimal uncollimated beam condition, which provides immunity to temperature changes and variations in the direction of the propagating beam, compensating for the temperature dependence of the quartz 1/4 wave plate. The experimental data support the simulated results.

© 2001 Optical Society of America

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