基于太赫兹气体激光器的连续波成像系统性能分析(英文)

Performance of the continuous-wave imaging system based on a terahertz gas laser

实现了基于光泵浦远红外气体激光器和高莱管探测器的连续波太赫兹成像.从太赫兹光学器件的选择和配置角度讨论了成像系统的设计和搭建流程.详细测试了系统在信噪比、空间分辨率、探测器响应和成像速度方面的性能指标.利用该系统采集了一系列样品的太赫兹透射图像,实验结果验证了系统的成像效果,揭示出太赫兹成像技术在安全检查和质量控制方面的应用可行性.为了消除激光器功率漂移对图像质量的影响,提出了一种对图像背景区强度进行自动校准的数据处理方法.

Continuous-wave terahertz imaging was demonstrated based on an optically-pumped far-infrared gas laser and a Golay cell detector.The imaging system design and construction are discussed in the context of the choice and configuration of the involved terahertz optical components and devices.Performance characteristics of the system,including signal-to-noise ratio,spatial resolution,detector response and imaging speed were measured and analyzed in detail.With this system,terahertz transmission images of various samples were obtained,confirming the quality of our setup and supporting the feasibility of terahertz imaging technique for applications in security screening and quality control.A data processing method for automatic calibration of the image intensities in the background region was also proposed to remove the influence of laser power drift on the image quality.