Temperature-dependent Sellmeier equations of UV nonlinear optical crystal NaSr3Be3B3O9F4

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2025-05-13 DOI:10.1016/j.optmat.2025.117157

Shuangyue Shang , Lei Bai , Lirong Wang , Jiajian Ning , Tong Wu , Tianhong Huang , Lijuan Liu , Xiaoyang Wang

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Abstract

NaSr₃Be₃B₃O₉F₄ (NSBBF) is a highly promising ultraviolet (UV) nonlinear optical crystal for generating high-power 266 nm laser light. However, the impact of temperature rise on its refractive indices during high-power operation remains poorly understood, which can lead to phase mismatch and reduced conversion efficiency. In this study, the principal refractive indices of NSBBF were precisely measured using the minimum deviation method across a wavelength range of 0.253 μm–1.014 μm at temperatures of 25 °C, 50 °C, 80 °C, 100 °C, 120 °C, and 150 °C. The thermal refractive index coefficients were fitted as a function of wavelength, and temperature-dependent Sellmeier equations were derived. Predictions of phase-matching angles based on these equations were experimentally validated through fourth harmonic generation experiments. These findings provide crucial insights for the thermal design and optimization of NSBBF-based frequency conversion devices, enabling higher-power laser generation.

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紫外非线性光学晶体NaSr3Be3B3O9F4的温度相关Sellmeier方程

NaSr3Be3B3O9F4 （NSBBF）是一种非常有前途的紫外非线性光学晶体，可产生高功率266nm激光。然而，在高功率工作时，温度升高对其折射率的影响尚不清楚，这可能导致相位失配和转换效率降低。在25°C、50°C、80°C、100°C、120°C和150°C的温度下，采用最小偏差法在0.253 μm - 1.014 μm波长范围内精确测量了NSBBF的主折射率。将热折射率系数拟合为波长的函数，导出了与温度相关的Sellmeier方程。通过四次谐波产生实验验证了基于这些方程的相位匹配角预测。这些发现为基于nsbbf的变频器件的热设计和优化提供了重要的见解，从而实现了更高功率的激光产生。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.