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报道了一种基于频率可调谐准高斯太赫兹波束的透射成像系统.研究表明,在这种成像系统中太赫兹波束具有良好的空间分布特性,其波束质量因子M2x=1.15,M2z=1.25,波束传输特性和聚焦特性良好.实验结果反映出成像系统的空间分辨能力与典型太赫兹波长(250μm)相接近.在太赫兹波输出1.0—2.5THz范围内,成像系统信噪比大于1000dB;在1.8THz处,信噪比大于6000dB.利用这种太赫兹波透射成像系统对样品进行了成像实验,并得到较为清晰的图像.
A transmission imaging system based on frequency-tunable quasi-Gaussian terahertz (THz) beams is reported.The results show that the THz beams have a good spatial distribution in this imaging system with beam quality factors of M2x = 1.15, M2z = 1.25, beam The transmission characteristics and focusing characteristics are good.The experimental results show that the spatial resolution of the imaging system is close to the typical terahertz wavelength (250μm) .The signal to noise ratio of imaging system is more than 1000dB in the range of 1.0-2.5THz, THz Department, the signal to noise ratio is greater than 6000dB.Through this terahertz wave transmission imaging system of the sample imaging experiments, and get a more clear image.