| 基于铌酸锂晶体的电光取样探测技术在近红外少周期激光脉冲探测中的应用 |
| 投稿时间：2024-05-06 修订日期：2024-06-05 点此下载全文 |
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| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 中文摘要:电光取样探测技术常用于探测宽带太赫兹电场时域波形，而后该技术也用于探测近红外-中红外少周期激光脉冲电场波形。该技术中电光晶体的性能直接影响其探测的性能。本文研究了基于铌酸锂晶体的电光取样探测技术在近红外少周期激光脉冲探测中的应用，分析了该技术的频率响应函数和响应带宽，并详细分析了该技术在探测过程中引起的少周期激光脉冲畸变规律，包括中心频率和带宽的变化规律。研究发现，铌酸锂具有比较好的电光相应特性，在波长位于900 nm-2500 nm的近红外波段内，对含有1.5个振荡周期的少周期脉冲产生的测量误差依赖晶体厚度和待测的激光波长；当晶体厚度为10 ?m时，产生的带宽和中心频率偏差在1%以内；当晶体厚度为100 ?m时，产生的带宽最大偏差为25%、中心频率最大偏差10%。对含有2.5个振荡周期的少周期脉冲，产生的带宽和中心频率偏差明显减小。本文结果对实验上使用铌酸锂晶体电光取样探测技术测量少周期激光脉冲电场波形提供了很好的理论参考。 |
| 中文关键词:电光取样 铌酸锂 近红外 少周期激光脉冲 |
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| The application of electro-optic sampling detection technique based on the lithium niobate crystal in the detection of near-infrared few-cycle laser pulse |
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| Abstract:Electro-optic sampling (EOS) detection technique is generally used to detect broadband terahertz time waveforms, which is later developed to detect near- and mid-infrared few-cycle laser pulse. The performance of this detection is directly influenced by the electro-optic crystal. In this paper, we investigate the application of electro-optic sampling detection technique based on the lithium niobate (LN) crystal in the detection of near-infrared few-cycle laser pulse, discuss the frequency response function and response bandwidth of this technique, and analyze the detail of laser pulse distortions induced in the process of detection, including the changes of the central frequency and bandwidth. It is found that the lithium niobate has relatively good electro-optic correspondence properties, and the pulse distortions induced by the EOS detection depends on the crystal thickness and wavelength of few-cycle laser pulse. The bandwidth and central frequency changing are less 1% for the few-cycle laser pulse with 1.5 optical cycle using 10 ?m LN crystal; the bandwidth changing is 25% and central frequency is 10% when using 100 ?m LN crystal. For the few-cycle laser pulse with 2.5 optical cycles, these pulse distortions decrease obviously. These results provide a good theoretical reference for the application of EOS with LN crystals in the detection of the time waveform of near-infrared few-cycle laser pulse. |
| keywords:electro-optic sampling lithium niobate near-infrared few-cycle laser pulse |
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