| 基于铌酸锂晶体的电光取样探测技术在近红外波段的频率响应和应用分析 |
| 投稿时间：2024-05-06 修订日期：2024-06-05 点此下载全文 |
| 引用本文：王婧仪,余健雄,黄彬,刘翔,杜海伟.基于铌酸锂晶体的电光取样探测技术在近红外波段的频率响应和应用分析[J].红外,2024,45(11):40~48 |
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| 基金项目:国家自然科学基金项目（12064028）；江西省自然科学基金项目（20232BAB201045）；南昌航空大学研究生创新专项（YC2023-040） |
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| 中文摘要:电光取样探测(Electro-Optic Sampling, EOS)技术常用于探测宽带太赫兹辐射的电场时域波形，随后也被用于探测近红外-中红外波段的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和频率响应带宽。研究了基于铌酸锂晶体的EOS技术在近红外波段的频率响应特征和带宽，并详细分析了该技术在探测近红外少周期激光脉冲中的应用，特别是探测过程中引起的少周期激光脉冲的畸变规律(包括其中心频率和带宽的变化规律)。经研究发现，在波长为900~2500 nm的近红外波段内，该技术对含有1.5个振荡周期的少周期脉冲产生的测量误差依赖于晶体厚度和待测的激光波长。当晶体厚度为10 μm时，产生的带宽和中心频率偏差在1%以内；当晶体厚度为100 μm时，产生的带宽最大偏差为25%，中心频率最大偏差为10%。对于含有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。本文为实验中采用铌酸锂晶体EOS技术测量近红外波段少周期激光脉冲的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 Frequency Response of Electro-Optic Sampling Detection Technique Based on the Lithium Niobate Crystal in Near-Infrared Band and Its Application Analyzation |
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| Abstract:Electro-optic sampling (EOS) is often used to detect electric field waveform in the time domain of wideband terahertz radiation, and then it is also used to detect few-cycle laser pulse electric field waveform in the near-infrared to mid-infrared band. In this technique, the performance of electro-optic crystal directly affects its detection performance and frequency response bandwidth. In this paper, the frequency response characteristics and bandwidth of EOS based on lithium niobate crystal in the near-infrared band are studied, and the application of this technology in detecting few-cycle laser pulses is analyzed in detail, especially the distortion of few-cycle laser pulses caused by the detection process (including the changes of its center frequency and bandwidth). It is found that in the near-infrared band of 900－2500 nm, the measurement error of the few-cycle pulse with 1.5 oscillation cycles depends on the crystal thickness and the laser wavelength to be measured. When the crystal thickness is 10 μm, the deviation between bandwidth and center frequency is less than 1%. When the crystal thickness is 100 μm, the resulting maximum deviation of bandwidth is 25% and the maximum deviation of center frequency is 10%. For the few-cycle pulse with 2.5 oscillation cycles, the deviation of bandwidth and center frequency is obviously reduced. This paper provides a good theoretical reference for measuring the electric field waveform of few-cycle laser pulses in near-infrared band by means of EOS crystal. |
| keywords:electro-optic sampling lithium niobate near-infrared few-cycle laser pulse |
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