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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

798
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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基于脉冲集成种子注射自动锁定的高平均功率单频脉冲光学参数振荡器.

Jiaqi Song, Jiliang Qin, Xuechen Cao

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    一种新方法使用脉冲集成光探测器 (PIPD) 和微控制器单元 (MCU) 来从光学参数振荡器 (OPO) 创建稳定的单纵向模式 (SLM) 近红外纳秒 (ns) 脉冲光. 这种技术可以消除探测器和,从而实现精确的激光控制.

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    科学领域:

    • 非线性光学是非线性光学.
    • 激光物理 激光物理
    • 频谱学是一种光谱学.

    背景情况:

    • 来自光学参数振荡器 (OPO) 的单一纵向模式 (SLM) 近红外纳秒 (ns) 脉冲光对于非线性光学和高精度光谱分析至关重要.
    • 为了实现稳定的SLM OPO输出,现有的方法经常面临探测器和和复杂的控制机制的挑战.

    研究的目的:

    • 开发一种稳定可靠的方法,从OPO中产生SLM近红外NS脉冲光.
    • 克服以前技术的局限性,特别是探测器和,以改善光谱分析和非线性光学应用.

    主要方法:

    • 使用脉冲集成光探测器 (PIPD) 实现种子注射自动锁定技术.
    • 通过整合多个脉冲,PIPD将峰值脉冲功率转换为平均功率,防止探测器和.
    • 一个微控制器单元 (MCU) 通过在共振器长度扫描期间识别最小干扰信号来自动锁定OPO.

    主要成果:

    • 成功生成了一个稳定的SLM 824 nm ns脉冲光源.
    • 该OPO实现了20.5W的输出功率,其窄线宽为51.42MHz.
    • 开发的技术有效地消除了探测器和,从而实现了精确的控制和信号采集.

    结论:

    • 提出的种子注射自动锁定技术为稳定的SLM OPO运行提供了强大的解决方案.
    • 这种方法促进了低成本,紧,高平均功率的SLM脉冲OPO的开发.
    • 这些发现对推进高精度光谱分析和非线性光学应用具有重大意义.