非临界相位匹配二次谐波产生中的波束畸变和指向不稳定性

IF 3.7 2区工程技术 Q2 OPTICS

Optics and Lasers in Engineering Pub Date : 2025-09-16 DOI:10.1016/j.optlaseng.2025.109344

Yingtong Shi , Jiaqi Wang , Xiang Zhang , Zhongqi Liu , Hang Xu , Senlin Huang

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引用次数: 0

摘要

提出了一种用于二次谐波非关键相位匹配的三维相位失配模型。该模型改进了NCPM-SHG的模拟，对NCPM-SHG中的光束畸变现象提供了准确的预测。结合温度对相位匹配的影响，导出了指向抖动与NCPM-SHG晶体温控精度之间的关系。用三硼酸锂（LBO）晶体进行的研究表明，要实现20 μrad以下的指向抖动，需要晶体温度控制精度优于0.05℃。实验验证了理论模型的数值模拟，并首次定量分析了NCPM-SHG引入的光束畸变和指向抖动。我们的研究为基于NCPM-SHG的激光系统的光束轮廓优化和稳定性优化提供了有价值的参考。

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Beam distortion and pointing instability in non-critical phase matching second harmonic generation

We propose a three-dimensional phase mismatch model for non-critical phase matching in second harmonic generation (NCPM-SHG). The model refines the simulation of NCPM-SHG and provides accurate predictions of beam distortion phenomena in NCPM-SHG. With the incorporation of temperature effects on phase matching, we derive the relationship between pointing jitter and temperature control precision of NCPM-SHG crystals. Our study with Lithium Triborate (LBO) crystals indicates that achieving pointing jitter below 20 μrad requires crystal temperature control precision to be better than 0.05 °C. Numerical simulations of the theoretical model were validated experimentally, in which the beam distortion and pointing jitter introduced by NCPM-SHG are analyzed quantitatively for the first time. Our research provides a valuable reference for optimizing beam profile and stability in laser systems based on NCPM-SHG.

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来源期刊

Optics and Lasers in Engineering 工程技术-光学

CiteScore

8.90

自引率

8.70%

发文量

384

审稿时长

42 days

期刊介绍： Optics and Lasers in Engineering aims at providing an international forum for the interchange of information on the development of optical techniques and laser technology in engineering. Emphasis is placed on contributions targeted at the practical use of methods and devices, the development and enhancement of solutions and new theoretical concepts for experimental methods. Optics and Lasers in Engineering reflects the main areas in which optical methods are being used and developed for an engineering environment. Manuscripts should offer clear evidence of novelty and significance. Papers focusing on parameter optimization or computational issues are not suitable. Similarly, papers focussed on an application rather than the optical method fall outside the journal''s scope. The scope of the journal is defined to include the following: -Optical Metrology- Optical Methods for 3D visualization and virtual engineering- Optical Techniques for Microsystems- Imaging, Microscopy and Adaptive Optics- Computational Imaging- Laser methods in manufacturing- Integrated optical and photonic sensors- Optics and Photonics in Life Science- Hyperspectral and spectroscopic methods- Infrared and Terahertz techniques