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Photorefractive effect in LiNbO 3 -based integrated-optical circuits for continuous variable experiments

Abstract : We investigate the impact of photorefractive effect on lithium niobate integrated quantum pho-tonic circuits dedicated to continuous variable on-chip experiments. The circuit main building blocks, i.e. cavities, directional couplers, and periodically poled nonlinear waveguides are studied. This work demonstrates that, even when the effect of photorefractivity is weaker than spatial mode hopping, they might compromise the success of on-chip quantum photonics experiments. We describe in detail the characterization methods leading to the identification of this possible issue. We also study to which extent device heating represents a viable solution to counter this effect. We focus on photorefractive effect induced by light at 775 nm, in the context of the generation of non-classical light at 1550 nm telecom wavelength.
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https://hal.archives-ouvertes.fr/hal-02908852
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François Mondain, Floriane Brunel, Xin Hua, Elie Gouzien, Alessandro Zavatta, et al.. Photorefractive effect in LiNbO 3 -based integrated-optical circuits for continuous variable experiments. Optics Express, Optical Society of America - OSA Publishing, 2020. ⟨hal-02908852⟩

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