| Autor: |
Garzarella, A., Qadri, S. B., Wieting, Terence J., Wu, Dong Ho |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 6/1/2005, Vol. 97 Issue 11, p113108, 5p, 1 Diagram, 4 Graphs |
| Abstrakt: |
We have measured the electro-optic response of LiNbO3 and SrxBa1-xNb2O6 crystals to be used for electric-field sensors. Our results indicate that optically induced refractive index variations (photorefractivity) in the crystals affect the temporal stability and sensitivity of the sensors. Spatial distributions of the refractive indices produced from the photorefractivity create incoherence in the polarization of the probing laser passing through the crystal (optical probe). In LiNbO3 crystals, this spatial incoherence was negligible and sensor responsivities close to the theoretical maximum were attained. However, in SrxBa1-xNb2O6 crystals, strong spatial variations of the principal refractive indices resulted in an extremely incoherent polarization of the optical probe and reduced the electro-optic responsivity dramatically. The photorefractive-induced sensitivity loss is modeled using a distribution function (rather than a constant value) to describe the phase of the optical probe. These results emphasize the importance of an optically stable material, with little or no photorefractivity, when designing an electro-optic field sensor. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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