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Spatially Inhomogeneous Structures in a Surface-Doped Lithium Niobate Crystal for Light Beam Transformation

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Bulletin of the Russian Academy of Sciences: Physics Aims and scope

Abstract

Spatially inhomogeneous structures (SIS) are important to realize the integrated optical devices transmitting and processing light signals. Nowadays, there are several methods used to create such structures with different characteristics and topologies. However, research on the methods of forming and modifying the characteristics of these structures continues to this day. In this work, we create and study SIS in a lithium niobate crystal surface-doped with copper ions. The results prove that SIS can be created by the point-by-point method using a continuous-wave frequency-doubled YAG:Nd3+ laser. The realized structures were formed as diffraсtion and waveguide optical elements with different characteristics and topologies. It is demonstrated that we can change the refractive index up to 10–3 by the point-by-point illumination of an X‑cut lithium niobate crystal during the structure formation. The properties of the fabricated structures were investigated by diffraction analysis, laser interferometry, and the optical probing method using He–Ne laser radiation. On the formed diffraction structures (DSs), the far-field diffraction patterns (DPs) show that the light power transfers from the incident radiation to first-order maxima. The first-order maxima intensity can exceed the intensity of the zero-order maximum up to several times. The near-field study after the excitation of waveguide structures (WSs) shows that they exhibit the properties of mode filters. The point-by-point method of forming SIS may be useful for creating integrated optical circuits and modifying the characteristics of optoelectronic and photonic devices.

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Funding

The work was carried out as a part of strategic academic leadership program “Priority 2030” (subproject Pr2030-Nauka SCH/SP1/B/8) and with the support of the Innovation Promotion Fund within the framework of the UMNIK program (project under contract no. 18233GU/2022).

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  1. Tomsk State University of Control Systems and Radioelectronics, 634055, Tomsk, Russia

    A. D. Bezpaly, A. E. Mandel & V. I. Bykov

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  1. A. D. Bezpaly
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  2. A. E. Mandel
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  3. V. I. Bykov
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Correspondence to A. D. Bezpaly.

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Bezpaly, A.D., Mandel, A.E. & Bykov, V.I. Spatially Inhomogeneous Structures in a Surface-Doped Lithium Niobate Crystal for Light Beam Transformation. Bull. Russ. Acad. Sci. Phys. 87 (Suppl 3), S356–S363 (2023). https://doi.org/10.1134/S106287382370569X

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