Low-operation-voltage electro-optical modulator based on Fe:KNbO<sub>3</sub> crystal

Vladimir A. Dyakov; Alexei A. Podshivalov; Vladimir S. Syrtsov

doi:10.1117/12.648206

6 December 2006 Low-operation-voltage electro-optical modulator based on Fe:KNbO₃ crystal

Vladimir A. Dyakov, Alexei A. Podshivalov, Vladimir S. Syrtsov

Proceedings Volume 6023, Tenth International Conference on Nonlinear Optics of Liquid and Photorefractive Crystals; 60230L (2006) https://doi.org/10.1117/12.648206
Event: Tenth International Conference on Nonlinear Optics of Liquid and Photorefractive Crystals, 2005, Alushta, Ukraine

Abstract

Results of low- and high-frequency modulation of laser beam, propagating both in the direction of optical axis and along three crystallographic axes in Fe-doped KNb0₃ crystal, are presented. It was found, that the high-frequency electro-optical constants of Fe:KNb0₃ are: r₃₃ = (5353) pm/V, r₁₃ = (21±3) pm/V, and r₅₁ = (88±11) p d V . The difference between high- and low-frequency values is about 20% and this is in good accordance with known data for nominally pure crystal. We found also, that there was no twinning effect in this crystal under the electrical fields up to 2.5 kV/cm. The half-wave voltage was only 800 V at the wavelength of 633 nm in a longitudinal configuration of modulator. We measure also that bandpass of light modulation in Fe:KNb0₃ is equal to at least 6 MHz. In our experiments we also determined the speed of acoustic waves, created in the crystal by inverse piezoelectric effect, when fast HV electrical pulse is applied to it, these values are v_l=(56001100) d s and v₂=(6400±100) m/s along Oz and Ox axes correspondingly.

Citation Download Citation

Vladimir A. Dyakov, Alexei A. Podshivalov, and Vladimir S. Syrtsov "Low-operation-voltage electro-optical modulator based on Fe:KNbO₃ crystal", Proc. SPIE 6023, Tenth International Conference on Nonlinear Optics of Liquid and Photorefractive Crystals, 60230L (6 December 2006); https://doi.org/10.1117/12.648206

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