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Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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相关实验视频

Updated: Jul 3, 2025

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

7.5K

相当于非线性光学晶体的温度稳定.

K V Zotov, N V Tereschenko, A Yu Ostapiv

    Optics letters
    |February 15, 2024
    PubMed
    概括

    我们介绍了一种新的方法,用于稳定非线性光学晶体温度,使用压电共振 (PR) 频率. 这种技术提高了周期极酸 (PPLN) 激光器中的第二波 (SH) 生产稳定性和功率.

    科学领域:

    • 激光物理 激光物理
    • 材料科学 材料科学 材料科学
    • 光学工程是指光学工程.

    背景情况:

    • 非线性光学晶体对于激光频率转换至关重要.
    • 温度波动显著影响晶体性能和稳定性.
    • 外部温度传感器往往缺乏精度,并引入复杂性.

    研究的目的:

    • 为非线性光学晶体开发一种自传感温度稳定方法.
    • 提高激光频率转换过程的稳定性和效率.
    • 为了证明压电共振 (PR) 频率稳定的有效性.

    主要方法:

    • 使用晶体的压电共振 (PR) 频率作为内在温度传感器.
    • 使用电子振荡器方便地确定PR频率.
    • 实施 PR 频率稳定用于激光系统控制.

    主要成果:

    • 在周期极化酸 (PPLN) 中,在532nm处实现了第二波 (SH) 的稳定生成.
    • 与外部传感器方法相比,在SH生成中显示出超过30%的功率增强.
    • 显著改善了SH输出功率的长期稳定性.

    结论:

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    Last Updated: Jul 3, 2025

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    • PR频率稳定为非线性光学晶体温度控制提供了高效和方便的方法.
    • 这种自传感方法在稳定性和效率方面超过了传统的外部传感.
    • 该技术对推进高功率和稳定的激光系统具有前景.