275 GHz 附近铌酸锂中太赫兹产生效率、太赫兹折射率和太赫兹吸收的温度依赖性

IF 2.8 3区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Optical Materials Express Pub Date : 2024-06-18 DOI:10.1364/ome.528491
Umit Demirbas, Christian Rentschler, Zhelin Zhang, Mikhail Pergament, Nicholas H. Matlis, Franz X. Kärtner
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引用次数: 0

摘要

在这项研究中,我们展示了脉冲串激发方法在确定非线性晶体的关键材料特性(如折射率、热光学系数和吸收)方面的能力。该方法即使在相对较低的太赫兹频率下也能提供可靠的结果,而其他表征方法(如太赫兹时域光谱法)在这方面存在困难。为了说明我们方法的能力,我们使用了 800 fs 长脉冲和可调时间延迟的脉冲序列来研究极化周期为 400 µm 的周期性极化铌酸锂(PPLN)晶体的材料特性。通过扫描入射脉冲序列频率,我们测量了晶体在不同温度(78-350 K)下的频率响应,从而能够非常精确地确定 PPLN 晶体在 275 GHz 附近的折射率和热光学系数的温度依赖性。我们进一步详细研究了太赫兹产生效率随温度的变化,以了解 PPLN 材料的太赫兹吸收与温度的关系。所采用的技术非常通用,可应用于其他频率范围和非线性晶体。
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Temperature dependence of THz generation efficiency, THz refractive index, and THz absorption in lithium-niobate around 275 GHz
In this study, we demonstrate the capabilities of the pulse train excitation approach in determining key material properties of nonlinear crystals, such as refractive index, thermo-optic coefficient, and absorption. The method provides reliable results even at relatively low THz frequencies, where other characterization methods, such as THz time-domain spectroscopy, have difficulties. To illustrate the capabilities of our approach, we used pulse trains with 800-fs long pulses and adjustable time delay to investigate the material properties of periodically poled lithium niobate (PPLN) crystal with a poling period of 400 µm. Via scanning the incident pulse-train frequency, we measured the frequency response of the crystal at different temperatures (78-350 K), which enabled us to determine the temperature dependence of the refractive index and thermo-optic coefficient of the PPLN crystal around 275 GHz with very high precision. We further studied the variation of THz generation efficiency with temperature in detail to understand the temperature dependence of THz absorption in PPLN material. The technique employed is quite general and could be applied to both other frequency ranges and nonlinear crystals.
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来源期刊
Optical Materials Express
Optical Materials Express MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS
CiteScore
5.50
自引率
3.60%
发文量
377
审稿时长
1.5 months
期刊介绍: The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community. Optical Materials Express (OMEx), OSA''s open-access, rapid-review journal, primarily emphasizes advances in both conventional and novel optical materials, their properties, theory and modeling, synthesis and fabrication approaches for optics and photonics; how such materials contribute to novel optical behavior; and how they enable new or improved optical devices. The journal covers a full range of topics, including, but not limited to: Artificially engineered optical structures Biomaterials Optical detector materials Optical storage media Materials for integrated optics Nonlinear optical materials Laser materials Metamaterials Nanomaterials Organics and polymers Soft materials IR materials Materials for fiber optics Hybrid technologies Materials for quantum photonics Optical Materials Express considers original research articles, feature issue contributions, invited reviews, and comments on published articles. The Journal also publishes occasional short, timely opinion articles from experts and thought-leaders in the field on current or emerging topic areas that are generating significant interest.
期刊最新文献
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