National Key Laboratory of Tunable Laser Technology, Harbin Institute of Technology, No. 2 YiKuang Street, Harbin 150080, China.
Opt Lett. 2011 Jun 1;36(11):1993-5. doi: 10.1364/OL.36.001993.
Terahertz (THz) digital holography is realized based on a 2.52 THz far-IR gas laser and a commercial 124 × 124 pyroelectric array camera. Off-axis THz holograms are obtained by recording interference patterns between light passing through the sample and the reference wave. A numerical reconstruction process is performed to obtain the field distribution at the object surface. Different targets were imaged to test the system's imaging capability. Compared with THz focal plane images, the image quality of the reconstructed images are improved a lot. The results show that the system's imaging resolution can reach at least 0.4 mm. The system also has the potential for real-time imaging application. This study confirms that digital holography is a promising technique for real-time, high-resolution THz imaging, which has extensive application prospects.
太赫兹（THz）数字全息术是基于 2.52 THz 远红外气体激光和商用的 124×124 热释电面阵相机实现的。通过记录光穿过样品和参考波之间的干涉图案，获得离轴太赫兹全息图。通过数值重建过程，获得物体表面的场分布。对不同的目标进行成像，以测试系统的成像能力。与太赫兹焦平面图像相比，重建图像的质量得到了很大的提高。结果表明，系统的成像分辨率至少可达 0.4 毫米。该系统还具有实时成像应用的潜力。本研究证实，数字全息术是一种很有前途的实时、高分辨率太赫兹成像技术，具有广泛的应用前景。
