Specific features of radiation flux formation in diode-pumped lasers and amplifiers with active elements made of Nd : YAG ceramics

IF 0.9 4区工程技术 Q3 Engineering

Quantum Electronics Pub Date : 2022-05-01 DOI:10.1070/qel18041

M. V. Bogdanovich, V. Dudikov, K. V. Lepchenkov, V. Loiko, Y. Popov, A. G. Ryabtsev, G. I. Ryabtsev, P. Shpak, M. A. Shchemelev

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Abstract

The spatial, temporal, and spectral characteristics of the output radiation of diode-pumped laser systems and optical amplifiers with active elements made of Nd : YAG ceramics are studied. It is shown that the divergence of radiation in the subthreshold regime has the form of concentric nested cones emerging from the active element (AE) faces at angles of 2 – 4 °. A model explaining the experimentally observed phenomenon is proposed based on the mechanism of scattering of the generated beam from the granular structure of the optical ceramics. Analysis of the divergence pattern makes it possible to estimate the grain size and the optical quality of ceramics. The output beam divergence in the lasing regime is determined mainly by the cavity parameters and does not exceed several milliradians. The scattering events in this case serve as sources of additional optical losses. Luminescence enhancement and parasitic oscillations in the AE volume restrict the possibility of using Nd : YAG ceramics for fabricating AEs of high-power optical amplifiers.

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Nd: YAG陶瓷有源二极管泵浦激光器和放大器辐射通量形成的具体特征

研究了Nd: YAG陶瓷有源元件二极管泵浦激光系统和光放大器输出辐射的空间、时间和光谱特性。结果表明，亚阈值区辐射散度以2 ~ 4°角从有源面出现的同心嵌套锥的形式存在。基于光学陶瓷颗粒结构产生的光束散射机理，提出了一个解释实验观察到的现象的模型。通过对散度图的分析，可以估计陶瓷的晶粒尺寸和光学质量。激光器的输出光束散度主要由腔参数决定，不超过几个毫弧度。在这种情况下，散射事件是附加光学损耗的来源。发射体积中的发光增强和寄生振荡限制了使用Nd: YAG陶瓷制造高功率光放大器的AE的可能性。

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来源期刊

Quantum Electronics 工程技术-工程：电子与电气

CiteScore

3.00

自引率

11.10%

发文量

审稿时长

3-6 weeks

期刊介绍： Quantum Electronics covers the following principal headings Letters Lasers Active Media Interaction of Laser Radiation with Matter Laser Plasma Nonlinear Optical Phenomena Nanotechnologies Quantum Electronic Devices Optical Processing of Information Fiber and Integrated Optics Laser Applications in Technology and Metrology, Biology and Medicine.