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Temperature dependence of LiNbO3 dislocation density in the near-surface layer

Chinese Optics Letters 2022年第6期20卷 40-46页

作者： Oksana Semenova Aleksei Sosunov nikolai prokhorov Roman Ponomarev Department of Nanotechnology and Microsystems Engineering Perm State UniversityPerm 614990Russia Perm Federal Research Center of the Ural Branch of the Russian Academy of Sciences Perm 614990Russia

Density of dislocations in the near-surface layer was investigated in X-cut LiNbO_(3) depending on thermal annealing in the temperature range of 400℃–600℃.A dynamic model of randomly distributed dislocations has been developed for LiNbO_(3) by using X-ray *** experimental results showed that the dislocation density of the near-surface layer reached the minimum at the thermal annealing temperature of 500℃,with the analysis being performed when wet selective etching and X-ray diffraction methods were *** concluded that homogenization annealing is an effective technique to improve the quality of photonic circuits based on LiNbO_(3).The results obtained are important for optical waveguides,LiNbO_(3)-on-insulator-based micro-photonic devices,electro-optical modulators,sensors,etc.

关键词： lithium niobate etching pits near-surface layer density of dislocations annealing X-ray diffraction

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Nonlinear Change in Refractive Index and Transmission Coefficient of ZnSe:Fe<sup>2+</sup>at Long-Pulse 2.94-μm Excitation

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Optics and Photonics Journal 2015年第1期5卷 15-27页

作者： Alexander V. Kir’yanov nikolai N. Il’ichev Elmira S. Gulyamova Alexander S. Nasibov Peter V. Shapkin Centro de Investigaciones en Optica Loma del Bosque 115 Lomas del Campestre Leon Mexico M.V. Lomonosov Moscow State University Physics Department Vorobyevy Gory 1 Moscow Russia A.M. prokhorov General Physics Institute (Russ. Acad. Sci.) Ul. Vavilova 38 Moscow Russia P.N. Lebedev Physical Institute (Russ. Acad. Sci.) Ul. Vavilova 38 Moscow Russia

An experimental study of the nonlinear changes in refractive index and transmission coefficient of single-crystal ZnSe:Fe2+, fabricated through the Fe-diffusion method, at long-pulse (~300 ns), sub-mJ, 2.94-mm Z-scan probing is reported. As well, a theoretical model based on the generalized Avizonis-Grotbeck equations is developed and applied for straightforward fitting of the open- and closed-aperture Z-scans, obtained for ZnSe:Fe2+ with different Fe2+ centers concentrations. The modeling results reveal that the contributions in the absorption and refractive index nonlinearities of ZnSe:Fe2+ are “common” resonant-absorption saturation (the minor part) and pulse-induced heating of the samples (the major part), which are strongly dependent on Fe2+ concentrations. Large values of the index change (>~10-3) and partial resonant-absorption bleaching (limited by ~50%), both produced via the thermal effect mainly, are the features of the ZnSe:Fe2+ samples inherent to this type of excitation.

关键词： Nonlinear Refractive index Nonlinear Transmission Z-Scan Technique Thermal lens ZnSe:Fe2+

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