飞秒激光直写制备Tm，Yb:YAG晶体双线波导的微观结构和光学特性

IF 3.6 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-09-04 DOI:10.1016/j.jlumin.2025.121517

Hui Huang, Zhihao Zhang, Xiang Li, Yang Zhang, Lingxiu Chen, Xiaolan Xue, Yue Yu, Liwei Shi, Jun Tang, Chuanlei Jia

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引用次数: 0

摘要

在这项工作中，利用飞秒激光直接写入技术，成功地在Tm，Yb:YAG晶体中制备了双线波导。通过金相显微镜对波导的微观结构特征进行了表征，端面耦合实验证实了波导在可见光和近红外光谱区具有较好的引导性能和较低的传播损耗。系统研究了激光脉冲能量和写入速度对波导结构和传输性能的影响。此外，利用反射-差分光谱（RDS）和微拉曼光谱分析了飞秒激光引起的折射率改变机理和晶格结构变化。结果表明，利用RDS首次直接观测到Tm，Yb:YAG晶体中应力诱导双折射效应引起的局部光学各向异性。揭示了实现有效光场约束的微物理性质，为开发基于稀土掺杂晶体的高性能集成光子器件提供了经验。

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Microstructure and optical properties of dual-line waveguides in Tm,Yb:YAG crystal fabricated by femtosecond laser direct writing

In this work, dual-line waveguides are successfully fabricated in Tm,Yb:YAG crystals using femtosecond laser direct writing. The microstructural features of the waveguides are characterized by metallographic microscopy, and the end-face coupling experiments confirm the better guiding performance and low propagation loss in both the visible and near-infrared spectral regions. The effects of laser pulse energy and writing speed on waveguide structure and transmission performance are systematically investigated. Furthermore, reflectance-difference spectroscopy (RDS) and Micro-Raman spectroscopy are utilized to analyze the refractive index modification mechanism and lattice structural changes induced by the femtosecond laser. The results demonstrate the first direct observation of local optical anisotropy caused by stress-induced birefringence effects in Tm,Yb:YAG crystals using RDS. We reveal the microphysical nature of realizing effective optical field confinement and provide experience in developing high-performance integrated photonic devices based on rare-earth doped crystals.

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.