LFI-dataset

The datasets comprise measurements of a confocal imaging setup with a THz quantum cascade laser acting as source, detector, and pinhole via laser feedback interferometry (LFI). The optical system is fully characterised by performing beam profile measurements with a pyroelectric detector at different stages of the system. The point-spread function of the LFI-based system is measured, via a knife-edge technique, and compared to the point spread function of a conventional imaging configuration utilising a pyroelectric detector. Different focusing numerical apertures are employed for which beam profiles, axial signal distribution, and imaging of resolution targets are performed. Finally, 3D tomography imaging of a printed circuit board is conducted to test the system's performance.

本数据集包含采用激光反馈干涉法（laser feedback interferometry, LFI）的共焦成像装置的测量数据，该装置以太赫兹量子级联激光器（THz quantum cascade laser）同时作为光源、探测器与针孔。研究团队通过在系统不同光学位置使用热释电探测器（pyroelectric detector）开展光束轮廓测量，对该光学系统进行了完整表征。通过刀口法（knife-edge technique）测量了基于LFI的成像系统的点扩散函数（point-spread function），并与采用热释电探测器的传统成像配置的点扩散函数进行了对比。实验采用了不同的聚焦数值孔径（numerical apertures），针对各孔径分别完成了光束轮廓测量、轴向信号分布测量以及分辨率靶标成像实验。最后，通过对印刷电路板（printed circuit board）开展三维层析成像，验证了该系统的实际成像性能。