| 光纤耦合式太赫兹辐射源设计与测试 |
| 投稿时间：2024-12-20 修订日期：2025-01-06 点此下载全文 |
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| 基金项目:国家自然科学基金项目(62127804)、国家重点研发计划项目(2023YFF0722400) |
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| 中文摘要:光电导天线是目前太赫兹时域光谱仪系统中使用最多的太赫兹辐射源之一。本文基于光电导天线太赫兹信号产生原理,利用InGaAs/InAlAs超晶格材料光电导天线芯片,开展1560nm激光激发的光纤耦合式太赫兹辐射源模块的设计与仿真。通过集成化的光路与结构设计,获得小型化光纤耦合式太赫兹辐射源。在平均功率25mW、脉宽100fs、中心波长1560nm的飞秒脉冲激光激发下,太赫兹辐射源单条波形采样中得到的太赫兹信号光谱范围就达到0.1~2.9THz,同时动态范围达到57dB。另外,通过实验探究了太赫兹辐射源输出信号幅值与偏置电压和激励光功率之间的关系。 |
| 中文关键词:光电导天线 太赫兹辐射源 光纤耦合 InGaAs/InAlAs超晶格 |
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| Design and Test of Fiber-Coupled Terahertz Radiation Source |
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| Abstract:Photoconductive antenna (PCA) is one of the most used terahertz (THz) radiation sources in terahertz time domain spectrometry (THz-TDS) system. In this paper, a 1560nm laser-excited fiber-coupled terahertz radiation source module is designed and simulated using InGaAs/InAlAs superlattice PCA chip based on the principle of terahertz signal generating by PCA. Through the integrated design of optical path and structure, the miniaturized terahertz radiation source is obtained. Under the excitation of femtosecond pulse laser with an average power of 25mW, pulse width of 100fs and central wavelength of 1560nm, THz signal with the spectral range of 0.1~2.9THz and the dynamic range of 57dB obtained is achieved from sampling of single waveform of terahertz radiation source. In addition, the excitation light power, the bias voltage and the relationship between the output signal amplitude of the terahertz radiation source is investigated experimentally. |
| keywords:photoconductive antenna terahertz radiation source fiber-coupled InGaAs/InAlAs superlattice |
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