Abstract

Besides the well-known LiNbO<sub>3</sub>, ferroelectric strontium barium niobate (SBN) crystals are attractive for electrooptic modulation applications because of their high electrooptic coefficients and low half wave voltage. Their EO properties, typically obtained under low frequency electric field driving conditions, contain both primary and secondary contributions arising from electromechanical coupling. Single crystal fibers (Sr,Ba)Nb<sub>2</sub>O<sub>6</sub> and LiNbO<sub>3</sub> grown by laser heated pedestal growth method are investigated to explore the frequency dependence of electrooptic property both for mechanically stress-free crystals (low frequency) and at microwave driving frequency of 10GHz. An optical pulse can be up-tuned/down-tuned, squeezed/ expended in the range of GHz using a single piece of SBN crystal fiber under a moderate microwave field, controlled by the relative position of optical pulse traversing the crystal fiber to the microwave field. The effective microwave-photonic interactions demonstrated in ferroelectric SBN crystals provide a potential solution for the bandwidth definitions and wavelength tuning applications. The experimental configuration and the analysis are also of general significance in electrooptic property studies at microwave frequencies.

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