najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2025-16-3-291-297najo-316Research ArticleNANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICSНАНОСИСТЕМЫ: ФИЗИКА, ХИМИЯ, МАТЕМАТИКАStudy of femtosecond laser amplification in MgO:LiTaO3 crystals with periodic nonlinear propertiesИсследование усиления фемтосекундного лазера в кристаллах MgO:LiTaO₃ с периодическими нелинейными свойствамиhttps://orcid.org/0009-0002-8210-2387СобировО. И.SabirovO. I.

Obid I. Sabirov

Kh. Alimjan Str. 14, Urgench, 220100, Khorezm Region

obid7432505@gmail.comРаджабовА. Э.RajabovA. E.

Alisher E. Rajabov

Kh. Alimjan Str. 14, Urgench, 220100, Khorezm Region

МатназаровА. Р.MatnazarovA. R.

Anvar R. Matnazarov

Gurlan-2 Str., Urgench, 220100, Khorezm Region

https://orcid.org/0000-0003-1168-2572ЭшчановБ. Х.EshchanovB. Kh.

Bakhodir Kh. Eshchanov

Amir Temur Str. 104, Chirchik, Tashkent Region

bakhodir.eshchanov@gmail.comОтажановШ.OtajanovSh.

Shavkat Otajanov

University Str. 4, Tashkent, 100174

https://orcid.org/0000-0001-8040-4395СапаевУ. К.SapaevU. K.

Usman K. Sapaev

Durmon Yuli Street 34, Tashkent, 100125

usapaev@gmail.comUrgench State UniversityUzbekistanUrgench Innovative UniversityUzbekistanChirchik State Pedagogical UniversityUzbekistanNational University of Uzbekistan named after Mirzo UlugbekUzbekistanTashkent Branch of the Russian Gubkin UniversityUzbekistan202529062025163291297Copyright © Sabirov O.I., Rajabov A.E., Matnazarov A.R., Eshchanov B.K., Otajanov S., Sapaev U.K., 20252025Собиров О.И., Раджабов А.Э., Матназаров А.Р., Эшчанов Б.Х., Отажанов Ш., Сапаев У.К.Sabirov O.I., Rajabov A.E., Matnazarov A.R., Eshchanov B.K., Otajanov S., Sapaev U.K.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/316

This work presents a theoretical study of the parametric amplification process of optical radiation in crystals with periodic modulation of quadratic nonlinear susceptibility, using MgO:LiTaO3 as an example. Special attention is given to analyzing the influence of basic factors such as linear absorption and dispersion on the process efficiency. It is found that in the infrared spectral range, linear absorption and dispersion effects significantly affect the signal wave amplification coefficient, determining the energy redistribution dynamics and spectral characteristics of the resulting radiation. The study introduces a novel approach to optimizing domain length relative to coherence length, achieving up to 18 % efficiency through precise tuning, which surpasses previously reported results for similar materials. The obtained results are important for optimizing nonlinear crystal parameters, developing efficient parametric amplification schemes, and creating promising optical devices operating in the infrared range.

В данной работе представлено теоретическое исследование процесса параметрического усиления оптического излучения в кристаллах с периодической модуляцией квадратичной нелинейной восприимчивости на примере MgO:LiTaO₃. Особое внимание уделено анализу влияния основных факторов, таких как линейное поглощение и дисперсия, на эффективность процесса. Установлено, что в инфракрасном спектральном диапазоне эффекты линейного поглощения и дисперсии существенно влияют на коэффициент усиления сигнальной волны, определяя динамику перераспределения энергии и спектральные характеристики получаемого излучения. В исследовании предложен новый подход к оптимизации длины домена относительно длины когерентности, что позволило достичь эффективности до 18% за счет точной настройки, превосходящей ранее опубликованные результаты для аналогичных материалов. Полученные результаты имеют важное значение для оптимизации параметров нелинейных кристаллов, разработки эффективных схем параметрического усиления и создания перспективных оптических устройств, работающих в инфракрасном диапазоне.

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The authors declare that there are no conflicts of interest present.