Abstract
An electro-optic crystal probe has been used to measure noninvasively the strength of the electric stray field of coplanar λ/2-resonators at about 6GHz. Resonators have been structured from a single layer of the high temperature superconductor Y Ba 2 Cu 3O 7- x as well as from copper. The spatial electric field distribution along the resonator lines shows the expected functional behavior. Field mapping however, requires that the vertical probe position is maintained with great accuracy. From the measurements of the field strength versus frequency the resonator quality factors can be determined. Good agreement with measurements carried out with a microwave network analyzer has been found.
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