pimiПриборы и методы измеренийDevices and Methods of Measurements2220-95062414-0473BNTUpimi-120Research ArticleМетоды измерений, контроля, диагностикиMethods of measurements, monitoring, diagnosticsОПРЕДЕЛЕНИЕ ПАРАМЕТРОВ ТЕРМИЧЕСКОЙ ЛИНЗЫ В АНИЗОТРОПНЫХ ЛАЗЕРНЫХ КРИСТАЛЛАХ В УСЛОВИЯХ ДИОДНОЙ НАКАЧКИTHERMAL LENSING MEASUREMENTS IN THE ANISOTROPIC LASER CRYSTALS UNDER DIODE PUMPINGЛойкоП. А.LoikoP. A.kyumashev@bntu.byСавицкийВ. Г.SavitskiV. G.kyumashev@bntu.byЮмашевК. В.YumashevK. V.kyumashev@bntu.byКулешовН. В.KuleshovN. V.kyumashev@bntu.byПавлюкА. А.PavlyukA. A.kyumashev@bntu.byCenter for Optical Materials and Technologies, Belarusian National Technical UniversityBelarusInstitute of Photonics, University of Strathclyde, Wolfson Centre, 106 Rottenrow, Glasgow G4 0NWUnited KingdomNikolaev Institute for Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences, NovosibirskRussian Federation201224042015016268Copyright © Лойко П.А., Савицкий В.Г., Юмашев К.В., Кулешов Н.В., Павлюк А.А., 20152015Лойко П.А., Савицкий В.Г., Юмашев К.В., Кулешов Н.В., Павлюк А.А.Loiko P.A., Savitski V.G., Yumashev K.V., Kuleshov N.V., Pavlyuk A.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://pimi.bntu.by/jour/article/view/120

Создана экспериментальная установка для определения параметров термической линзы в анизотропных лазерных кристаллах в условиях диодной накачки. Активный элемент на основе исследуемого кристалла помещается в устойчивый двухзеркальный резонатор с ТЕМ00 модой выходного излучения. Для различных меридиональных плоскостей экспериментально определяются зависимости радиуса моды выходного излучения от плотности мощности накачки. Моделирование этих зависимостей при помощи методов матричной оптики позволяет определить коэффициенты чувствительности и степень астигматизма термической линзы. При помощи данной методики экспериментально определены параметры термической линзы в моноклинном кристалле Nd:KGd(WO4)2 в условиях диодной накачки на длине волны 1067 нм для поляризации света E || Nm.

An experimental setup was developed for thermal lensing measurements in the anisotropic diode-pumped laser crystals. The studied crystal is placed into the stable two-mirror laser cavity operating at the fundamental transversal mode. The output beam radius is measured with respect to the pump intensity for different meridional planes (all these planes contain the light propagation direction). These dependencies are fitted using the ABCD matrix method in order to obtain the sensitivity factors showing the change of the optical power of thermal lens due to variation of the pump intensity. The difference of the sensitivity factors for two mutually orthogonal principal meridional planes describes the thermal lens astigmatism degree. By means of this approach, thermal lensing was characterized in the diode-pumped monoclinic Np-cut Nd:KGd(WO4)2 laser crystal at the wavelength of 1.067 μm for light polarization E || Nm.

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